Pi-hole sometimes hangs when requesting npmjs.org or archive.raspberrypi.org

Help
1

I have a pi-hole setup (Pi-hole Version v4.4 Web Interface Version v4.3.3 FTL Version v4.3.1) on a clean raspbian stretch running on a RasPi3 (not B+). It works like a charm most of the time. I have another RasPi4 running raspbian buster. Sometimes when I want to update npm packages or update packages through apt on any one of the two RasPis, the commands hang for a long time. It doesn't seem to be able to retrieve an IP address for the name archive.raspberrypi.org.
As upstream DNS server I use cloudflare.

When I then try to manually ping the url the ping command hangs for around 300 seconds, then throwing an error ping: archive.raspberrypi.org: Temporary failure in name resolution. The site was online and available at that time (checked via mobile connection).

ping to google.com or any other site seems to work flawlessly though. Also ad-blocking works. Weirdly at some point it will start working again without me having changed anything!

Expected Behaviour:

The command ping archive.raspberrypi.org should always be able to retrieve an IP address quickly and ping the target.

Actual Behaviour:

ping archive.raspberrypi.org hangs for a long time then returns error message ping: archive.raspberrypi.org: Temporary failure in name resolution

Debug Token:

[https://tricorder.pi-hole.net/ratp2rlua8]

On the dashboard the DNS query is shown the following way:

pihole_error
pihole_error1243×935 69.3 KB

Here are the contents of my /etc/resolv.conf on the pi-hole pi

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.0.1

and of my /etc/nsswitch.conf on the pi-hole pi

# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.

passwd:         compat
group:          compat
shadow:         compat
gshadow:        files

hosts:          files dns
networks:       files

protocols:      db files
services:       db files
ethers:         db files
rpc:            db files

netgroup:       nis

Here is the output of sudo strace ping npmjs.org. It hangs after displaying the last read(5,

Any ideas?

execve("/bin/ping", ["ping", "npmjs.org"], 0xbef627f4 /* 14 vars */) = 0
brk(NULL)                               = 0x7c0000
uname({sysname="Linux", nodename="raspberrypi4", ...}) = 0
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6f85000
access("/etc/ld.so.preload", R_OK)      = 0
openat(AT_FDCWD, "/etc/ld.so.preload", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=54, ...}) = 0
mmap2(NULL, 54, PROT_READ|PROT_WRITE, MAP_PRIVATE, 3, 0) = 0xb6f84000
close(3)                                = 0
readlink("/proc/self/exe", "/bin/ping", 4096) = 9
openat(AT_FDCWD, "/usr/lib/arm-linux-gnueabihf/libarmmem-v7l.so", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\254\3\0\0004\0\0\0"..., 512) = 512
_llseek(3, 16748, [16748], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 960) = 960
_llseek(3, 16424, [16424], SEEK_SET)    = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\2\n\3\f\1\22\4\24"..., 45) = 45
_llseek(3, 16748, [16748], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 960) = 960
_llseek(3, 16424, [16424], SEEK_SET)    = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\2\n\3\f\1\22\4\24"..., 45) = 45
_llseek(3, 16748, [16748], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 960) = 960
_llseek(3, 16424, [16424], SEEK_SET)    = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\2\n\3\f\1\22\4\24"..., 45) = 45
_llseek(3, 16748, [16748], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 960) = 960
_llseek(3, 16424, [16424], SEEK_SET)    = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\2\n\3\f\1\22\4\24"..., 45) = 45
_llseek(3, 16748, [16748], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 960) = 960
_llseek(3, 16424, [16424], SEEK_SET)    = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\2\n\3\f\1\22\4\24"..., 45) = 45
_llseek(3, 16748, [16748], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 960) = 960
_llseek(3, 16424, [16424], SEEK_SET)    = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\2\n\3\f\1\22\4\24"..., 45) = 45
fstat64(3, {st_mode=S_IFREG|0644, st_size=17708, ...}) = 0
mmap2(NULL, 81964, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb6f42000
mprotect(0xb6f46000, 61440, PROT_NONE)  = 0
mmap2(0xb6f55000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0xb6f55000
close(3)                                = 0
munmap(0xb6f84000, 54)                  = 0
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=33432, ...}) = 0
mmap2(NULL, 33432, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb6f7c000
close(3)                                = 0
openat(AT_FDCWD, "/lib/arm-linux-gnueabihf/libcap.so.2", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0004\16\0\0004\0\0\0"..., 512) = 512
_llseek(3, 16872, [16872], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 16540, [16540], SEEK_SET)    = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 16872, [16872], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 16540, [16540], SEEK_SET)    = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 16872, [16872], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 16540, [16540], SEEK_SET)    = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 16872, [16872], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 16540, [16540], SEEK_SET)    = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 16872, [16872], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 16540, [16540], SEEK_SET)    = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
fstat64(3, {st_mode=S_IFREG|0644, st_size=17872, ...}) = 0
mmap2(NULL, 82080, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb6f2d000
mprotect(0xb6f31000, 61440, PROT_NONE)  = 0
mmap2(0xb6f40000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0xb6f40000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/arm-linux-gnueabihf/libidn2.so.0", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0 \20\0\0004\0\0\0"..., 512) = 512
_llseek(3, 110932, [110932], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 110596, [110596], SEEK_SET)  = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 110932, [110932], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 110596, [110596], SEEK_SET)  = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 110932, [110932], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 110596, [110596], SEEK_SET)  = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 110932, [110932], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 110596, [110596], SEEK_SET)  = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 110932, [110932], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 110596, [110596], SEEK_SET)  = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
fstat64(3, {st_mode=S_IFREG|0644, st_size=111932, ...}) = 0
mmap2(NULL, 176140, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb6f01000
mprotect(0xb6f1c000, 61440, PROT_NONE)  = 0
mmap2(0xb6f2b000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a000) = 0xb6f2b000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/arm-linux-gnueabihf/libnettle.so.6", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\300i\0\0004\0\0\0"..., 512) = 512
_llseek(3, 210000, [210000], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(3, 209644, [209644], SEEK_SET)  = 0
read(3, "A*\0\0\0aeabi\0\1 \0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 43) = 43
_llseek(3, 210000, [210000], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(3, 209644, [209644], SEEK_SET)  = 0
read(3, "A*\0\0\0aeabi\0\1 \0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 43) = 43
_llseek(3, 210000, [210000], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(3, 209644, [209644], SEEK_SET)  = 0
read(3, "A*\0\0\0aeabi\0\1 \0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 43) = 43
_llseek(3, 210000, [210000], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(3, 209644, [209644], SEEK_SET)  = 0
read(3, "A*\0\0\0aeabi\0\1 \0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 43) = 43
_llseek(3, 210000, [210000], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(3, 209644, [209644], SEEK_SET)  = 0
read(3, "A*\0\0\0aeabi\0\1 \0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 43) = 43
_llseek(3, 210000, [210000], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(3, 209644, [209644], SEEK_SET)  = 0
read(3, "A*\0\0\0aeabi\0\1 \0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 43) = 43
fstat64(3, {st_mode=S_IFREG|0644, st_size=211080, ...}) = 0
mmap2(NULL, 275188, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb6ebd000
mprotect(0xb6ef0000, 61440, PROT_NONE)  = 0
mmap2(0xb6eff000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x32000) = 0xb6eff000
close(3)                                = 0
openat(AT_FDCWD, "/lib/arm-linux-gnueabihf/libresolv.so.2", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0`$\0\0004\0\0\0"..., 512) = 512
_llseek(3, 70352, [70352], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1120) = 1120
_llseek(3, 69992, [69992], SEEK_SET)    = 0
read(3, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
_llseek(3, 70352, [70352], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1120) = 1120
_llseek(3, 69992, [69992], SEEK_SET)    = 0
read(3, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
_llseek(3, 70352, [70352], SEEK_SET)    = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1120) = 1120
_llseek(3, 69992, [69992], SEEK_SET)    = 0
read(3, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
fstat64(3, {st_mode=S_IFREG|0644, st_size=71472, ...}) = 0
mmap2(NULL, 145320, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb6e99000
mprotect(0xb6eaa000, 61440, PROT_NONE)  = 0
mmap2(0xb6eb9000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x10000) = 0xb6eb9000
mmap2(0xb6ebb000, 6056, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb6ebb000
close(3)                                = 0
openat(AT_FDCWD, "/lib/arm-linux-gnueabihf/libm.so.6", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\240r\0\0004\0\0\0"..., 512) = 512
_llseek(3, 463312, [463312], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(3, 462960, [462960], SEEK_SET)  = 0
read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 49) = 49
_llseek(3, 463312, [463312], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(3, 462960, [462960], SEEK_SET)  = 0
read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 49) = 49
_llseek(3, 463312, [463312], SEEK_SET)  = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(3, 462960, [462960], SEEK_SET)  = 0
read(3, "A0\0\0\0aeabi\0\1&\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 49) = 49
fstat64(3, {st_mode=S_IFREG|0644, st_size=464392, ...}) = 0
mmap2(NULL, 528504, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb6e17000
mprotect(0xb6e88000, 61440, PROT_NONE)  = 0
mmap2(0xb6e97000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x70000) = 0xb6e97000
close(3)                                = 0
openat(AT_FDCWD, "/lib/arm-linux-gnueabihf/libc.so.6", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\300x\1\0004\0\0\0"..., 512) = 512
_llseek(3, 1293204, [1293204], SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2800) = 2800
_llseek(3, 1289788, [1289788], SEEK_SET) = 0
read(3, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
_llseek(3, 1293204, [1293204], SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2800) = 2800
_llseek(3, 1289788, [1289788], SEEK_SET) = 0
read(3, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
_llseek(3, 1293204, [1293204], SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2800) = 2800
_llseek(3, 1289788, [1289788], SEEK_SET) = 0
read(3, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
_llseek(3, 1293204, [1293204], SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2800) = 2800
_llseek(3, 1289788, [1289788], SEEK_SET) = 0
read(3, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
_llseek(3, 1293204, [1293204], SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2800) = 2800
_llseek(3, 1289788, [1289788], SEEK_SET) = 0
read(3, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
_llseek(3, 1293204, [1293204], SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 2800) = 2800
_llseek(3, 1289788, [1289788], SEEK_SET) = 0
read(3, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
fstat64(3, {st_mode=S_IFREG|0755, st_size=1296004, ...}) = 0
mmap2(NULL, 1364764, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb6cc9000
mprotect(0xb6e01000, 65536, PROT_NONE)  = 0
mmap2(0xb6e11000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x138000) = 0xb6e11000
mmap2(0xb6e14000, 8988, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb6e14000
close(3)                                = 0
openat(AT_FDCWD, "/usr/lib/arm-linux-gnueabihf/libunistring.so.2", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0\320\266\0\0004\0\0\0"..., 512) = 512
_llseek(3, 1487224, [1487224], SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 1486892, [1486892], SEEK_SET) = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 1487224, [1487224], SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 1486892, [1486892], SEEK_SET) = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 1487224, [1487224], SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 1486892, [1486892], SEEK_SET) = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 1487224, [1487224], SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 1486892, [1486892], SEEK_SET) = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
_llseek(3, 1487224, [1487224], SEEK_SET) = 0
read(3, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1000) = 1000
_llseek(3, 1486892, [1486892], SEEK_SET) = 0
read(3, "A,\0\0\0aeabi\0\1\"\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\24\1\25"..., 45) = 45
fstat64(3, {st_mode=S_IFREG|0644, st_size=1488224, ...}) = 0
mmap2(NULL, 1553488, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0xb6b4d000
mprotect(0xb6cb7000, 61440, PROT_NONE)  = 0
mmap2(0xb6cc6000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x169000) = 0xb6cc6000
close(3)                                = 0
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb6f7a000
set_tls(0xb6f7a6d0)                     = 0
mprotect(0xb6e11000, 8192, PROT_READ)   = 0
mprotect(0xb6cc6000, 8192, PROT_READ)   = 0
mprotect(0xb6e97000, 4096, PROT_READ)   = 0
mprotect(0xb6eb9000, 4096, PROT_READ)   = 0
mprotect(0xb6eff000, 4096, PROT_READ)   = 0
mprotect(0xb6f2b000, 4096, PROT_READ)   = 0
mprotect(0xb6f40000, 4096, PROT_READ)   = 0
mprotect(0xb6f55000, 4096, PROT_READ)   = 0
mprotect(0x2c000, 4096, PROT_READ)      = 0
mprotect(0xb6f87000, 4096, PROT_READ)   = 0
munmap(0xb6f7c000, 33432)               = 0
brk(NULL)                               = 0x7c0000
brk(0x7e1000)                           = 0x7e1000
capget({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, NULL) = 0
capget({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, {effective=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PTRACE|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_NICE|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ, permitted=1<<CAP_CHOWN|1<<CAP_DAC_OVERRIDE|1<<CAP_DAC_READ_SEARCH|1<<CAP_FOWNER|1<<CAP_FSETID|1<<CAP_KILL|1<<CAP_SETGID|1<<CAP_SETUID|1<<CAP_SETPCAP|1<<CAP_LINUX_IMMUTABLE|1<<CAP_NET_BIND_SERVICE|1<<CAP_NET_BROADCAST|1<<CAP_NET_ADMIN|1<<CAP_NET_RAW|1<<CAP_IPC_LOCK|1<<CAP_IPC_OWNER|1<<CAP_SYS_MODULE|1<<CAP_SYS_RAWIO|1<<CAP_SYS_CHROOT|1<<CAP_SYS_PTRACE|1<<CAP_SYS_PACCT|1<<CAP_SYS_ADMIN|1<<CAP_SYS_BOOT|1<<CAP_SYS_NICE|1<<CAP_SYS_RESOURCE|1<<CAP_SYS_TIME|1<<CAP_SYS_TTY_CONFIG|1<<CAP_MKNOD|1<<CAP_LEASE|1<<CAP_AUDIT_WRITE|1<<CAP_AUDIT_CONTROL|1<<CAP_SETFCAP|1<<CAP_MAC_OVERRIDE|1<<CAP_MAC_ADMIN|1<<CAP_SYSLOG|1<<CAP_WAKE_ALARM|1<<CAP_BLOCK_SUSPEND|1<<CAP_AUDIT_READ, inheritable=0}) = 0
capget({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, NULL) = 0
capset({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, {effective=0, permitted=1<<CAP_NET_ADMIN|1<<CAP_NET_RAW, inheritable=0}) = 0
prctl(PR_SET_KEEPCAPS, 1)               = 0
getuid32()                              = 0
setuid32(0)                             = 0
prctl(PR_SET_KEEPCAPS, 0)               = 0
getuid32()                              = 0
geteuid32()                             = 0
openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=3031696, ...}) = 0
mmap2(NULL, 2097152, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb694d000
mmap2(NULL, 2596864, PROT_READ, MAP_PRIVATE, 3, 0x6b000) = 0xb66d3000
close(3)                                = 0
capget({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, NULL) = 0
capget({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, {effective=0, permitted=1<<CAP_NET_ADMIN|1<<CAP_NET_RAW, inheritable=0}) = 0
capset({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, {effective=1<<CAP_NET_RAW, permitted=1<<CAP_NET_ADMIN|1<<CAP_NET_RAW, inheritable=0}) = 0
socket(AF_INET, SOCK_DGRAM, IPPROTO_ICMP) = -1 EACCES (Permission denied)
socket(AF_INET, SOCK_RAW, IPPROTO_ICMP) = 3
socket(AF_INET6, SOCK_DGRAM, IPPROTO_ICMPV6) = -1 EACCES (Permission denied)
socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6) = 4
capget({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, NULL) = 0
capget({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, {effective=1<<CAP_NET_RAW, permitted=1<<CAP_NET_ADMIN|1<<CAP_NET_RAW, inheritable=0}) = 0
capset({version=_LINUX_CAPABILITY_VERSION_3, pid=0}, {effective=0, permitted=1<<CAP_NET_ADMIN|1<<CAP_NET_RAW, inheritable=0}) = 0
openat(AT_FDCWD, "/usr/lib/arm-linux-gnueabihf/gconv/gconv-modules.cache", O_RDONLY) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=26406, ...}) = 0
mmap2(NULL, 26406, PROT_READ, MAP_SHARED, 5, 0) = 0xb6f7e000
close(5)                                = 0
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 5
connect(5, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(5)                                = 0
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 5
connect(5, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(5)                                = 0
openat(AT_FDCWD, "/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=494, ...}) = 0
read(5, "# /etc/nsswitch.conf\n#\n# Example"..., 4096) = 494
read(5, "", 4096)                       = 0
close(5)                                = 0
stat64("/etc/resolv.conf", {st_mode=S_IFREG|0644, st_size=68, ...}) = 0
openat(AT_FDCWD, "/etc/host.conf", O_RDONLY|O_CLOEXEC) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=9, ...}) = 0
read(5, "multi on\n", 4096)             = 9
read(5, "", 4096)                       = 0
close(5)                                = 0
openat(AT_FDCWD, "/etc/resolv.conf", O_RDONLY|O_CLOEXEC) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=68, ...}) = 0
read(5, "# Generated by resolvconf\ndomain"..., 4096) = 68
read(5, "", 4096)                       = 0
close(5)                                = 0
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=33432, ...}) = 0
mmap2(NULL, 33432, PROT_READ, MAP_PRIVATE, 5, 0) = 0xb66ca000
close(5)                                = 0
openat(AT_FDCWD, "/lib/arm-linux-gnueabihf/libnss_files.so.2", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 5
read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0@\33\0\0004\0\0\0"..., 512) = 512
_llseek(5, 41552, [41552], SEEK_SET)    = 0
read(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(5, 41204, [41204], SEEK_SET)    = 0
read(5, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
_llseek(5, 41552, [41552], SEEK_SET)    = 0
read(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(5, 41204, [41204], SEEK_SET)    = 0
read(5, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
_llseek(5, 41552, [41552], SEEK_SET)    = 0
read(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(5, 41204, [41204], SEEK_SET)    = 0
read(5, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
fstat64(5, {st_mode=S_IFREG|0644, st_size=42632, ...}) = 0
mmap2(NULL, 131860, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0xb66a9000
mprotect(0xb66b2000, 65536, PROT_NONE)  = 0
mmap2(0xb66c2000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0x9000) = 0xb66c2000
mmap2(0xb66c4000, 21268, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xb66c4000
close(5)                                = 0
mprotect(0xb66c2000, 4096, PROT_READ)   = 0
munmap(0xb66ca000, 33432)               = 0
openat(AT_FDCWD, "/etc/hosts", O_RDONLY|O_CLOEXEC) = 5
_llseek(5, 0, [0], SEEK_CUR)            = 0
fstat64(5, {st_mode=S_IFREG|0644, st_size=132, ...}) = 0
read(5, "127.0.0.1\tlocalhost\n::1\t\tlocalho"..., 4096) = 132
_llseek(5, 0, [132], SEEK_CUR)          = 0
read(5, "", 4096)                       = 0
close(5)                                = 0
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=33432, ...}) = 0
mmap2(NULL, 33432, PROT_READ, MAP_PRIVATE, 5, 0) = 0xb66ca000
close(5)                                = 0
openat(AT_FDCWD, "/lib/arm-linux-gnueabihf/libnss_dns.so.2", O_RDONLY|O_LARGEFILE|O_CLOEXEC) = 5
read(5, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0(\0\1\0\0\0P\v\0\0004\0\0\0"..., 512) = 512
_llseek(5, 16900, [16900], SEEK_SET)    = 0
read(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(5, 16552, [16552], SEEK_SET)    = 0
read(5, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
_llseek(5, 16900, [16900], SEEK_SET)    = 0
read(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(5, 16552, [16552], SEEK_SET)    = 0
read(5, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
_llseek(5, 16900, [16900], SEEK_SET)    = 0
read(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1080) = 1080
_llseek(5, 16552, [16552], SEEK_SET)    = 0
read(5, "A.\0\0\0aeabi\0\1$\0\0\0\0056\0\6\6\10\1\t\1\n\2\22\4\23\1\24"..., 47) = 47
fstat64(5, {st_mode=S_IFREG|0644, st_size=17980, ...}) = 0
mmap2(NULL, 82092, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0xb6694000
mprotect(0xb6698000, 61440, PROT_NONE)  = 0
mmap2(0xb66a7000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0x3000) = 0xb66a7000
close(5)                                = 0
mprotect(0xb66a7000, 4096, PROT_READ)   = 0
munmap(0xb66ca000, 33432)               = 0
gettimeofday({tv_sec=1586729532, tv_usec=24032}, NULL) = 0
gettimeofday({tv_sec=1586729532, tv_usec=24155}, NULL) = 0
socket(AF_INET, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, IPPROTO_IP) = 5
connect(5, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.0.116")}, 16) = 0
gettimeofday({tv_sec=1586729532, tv_usec=24607}, NULL) = 0
poll([{fd=5, events=POLLOUT}], 1, 0)    = 1 ([{fd=5, revents=POLLOUT}])
sendmmsg(5, [{msg_hdr={msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\340a\1\0\0\1\0\0\0\0\0\0\5npmjs\3org\0\0\1\0\1", iov_len=27}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, msg_len=27}, {msg_hdr={msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="[b\1\0\0\1\0\0\0\0\0\0\5npmjs\3org\0\0\34\0\1", iov_len=27}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, msg_len=27}], 2, MSG_NOSIGNAL) = 2
poll([{fd=5, events=POLLIN}], 1, 5000)  = 1 ([{fd=5, revents=POLLIN}])
ioctl(5, FIONREAD, [219])               = 0
recvfrom(5, "\340a\201\200\0\1\0\f\0\0\0\0\5npmjs\3org\0\0\1\0\1\300\f\0\1\0"..., 2048, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.0.116")}, [28->16]) = 219
gettimeofday({tv_sec=1586729532, tv_usec=70007}, NULL) = 0
poll([{fd=5, events=POLLIN}], 1, 4954)  = 1 ([{fd=5, revents=POLLIN}])
ioctl(5, FIONREAD, [27])                = 0
recvfrom(5, "[b\203\200\0\1\0\0\0\0\0\0\5npmjs\3org\0\0\34\0\1", 65536, 0, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.0.116")}, [28->16]) = 27
close(5)                                = 0
socket(AF_INET, SOCK_STREAM|SOCK_CLOEXEC, IPPROTO_IP) = 5
connect(5, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("192.168.0.116")}, 16) = 0
writev(5, [{iov_base="\0\33", iov_len=2}, {iov_base="\340a\1\0\0\1\0\0\0\0\0\0\5npmjs\3org\0\0\1\0\1", iov_len=27}, {iov_base="\0\33", iov_len=2}, {iov_base="[b\1\0\0\1\0\0\0\0\0\0\5npmjs\3org\0\0\34\0\1", iov_len=27}], 4) = 58
read(5, "\0\333", 2)                    = 2
read(5, "\340a\201\200\0\1\0\f\0\0\0\0\5npmjs\3org\0\0\1\0\1\300\f\0\1\0"..., 219) = 219
read(5,
2

This doesn't look like an obvious Pi-hole failure, though I do not outright dismiss that Pi-hole is somehow involved in this, if only indirectly.

If Pi-hole would block a domain, you would see a "host not found" error message (or similar) rather than that "Temporary failure.." you did observe (try for the difference by pinging flurry.com or any other suitable domain that's being blocked by your Pi-hole.).

So likely, that error is an indication of your upstream DNS server indeed having a problem to resolve a domain. Your smartphone being able to resolve that specific domain may be another indicattion, as your phone might employ a different DNS server, perhaps even via a different network address (i.e IPv4 vs. IPv6).

If you have enabled DNSSEC, make sure that your RPi's time and time zone information is set correctly, as synchronised time frames are a prerequisite for DNSSEC signatures to work (and thus DNS lookups). I don't consider this likely on your machine, as that would very likely affect all of your DNS lookups, but better verify nonetheless.

Other than that, I do not see any obvious way how Pi-hole would contribute towards your observation.

If that keeps reoccuring without any addítional hints to Pi-hole's involvement, I'd probably consider switching to a more reliable set of upstream DNS servers.

3

Thank you, Bucking_Horn.

For now, changing to Google DNS servers (which I don't want to use) does seem to have fixed it. I will observe if the problem occurs again.

P.S.: I don't use DNSSEC.

4

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