Okay this seem it was MY Problem!
i can't believe it. Sorry for that.
root@mvps-vm1:~ # cat /etc/resolv.conf # 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
root@mvps-vm1:~ # pihole updatePihole [i] Checking for updates... [i] Pi-hole Core: up to date [i] Web Interface: up to date [i] FTL: up to date [?] Everything is up to date!
root@mvps-vm1:~ # pihole updateGravity [i] Pi-hole blocking is enabled [i] Neutrino emissions detected... [?] Pulling blocklist source list into range [i] Target: raw.githubusercontent.com (hosts) [?] Status: Retrieval successful [i] Target: mirror1.malwaredomains.com (justdomains) [?] Status: No changes detected [i] Target: sysctl.org (hosts) [?] Status: No changes detected [i] Target: zeustracker.abuse.ch (blocklist.php?download=domainblocklist) [?] Status: No changes detected [i] Target: s3.amazonaws.com (simple_tracking.txt) [?] Status: No changes detected [i] Target: s3.amazonaws.com (simple_ad.txt) [?] Status: No changes detected [i] Target: hosts-file.net (ad_servers.txt) [?] Status: No changes detected [i] Target: github.com (spy.txt) [?] Status: Retrieval successful [i] Target: localhost (adblock.hosts) [?] Status: Retrieval successful [i] Received empty file: using previously cached list [i] Target: raw.githubusercontent.com (anti-adblock-killer-filters.txt) [?] Status: Retrieval successful [i] Format: Adblockcomm: file 1 is not in sorted order [?] Format: Adblock [i] Target: raw.githubusercontent.com (trackers.txt) [?] Status: Retrieval successful [?] Consolidating blocklists [?] Extracting domains from blocklists [i] Number of domains being pulled in by gravity: 174629 [?] Removing duplicate domains [i] Number of unique domains trapped in the Event Horizon: 150545 [i] Number of whitelisted domains: 10 [i] Number of blacklisted domains: 4 [i] Number of regex filters: 1 [?] Parsing domains into hosts format [?] Cleaning up stray matter [?] Force-reloading DNS service [?] DNS service is running [?] Pi-hole blocking is Enabled
root@mvps-vm1:~ # pihole restartdns [?] Restarting DNS service
root@mvps-vm1:~ # apt update && apt upgrade OK:1 http://deb.debian.org/debian stretch-updates InRelease OK:2 http://security.debian.org/debian-security stretch/updates InRelease Ign:3 http://deb.debian.org/debian stable InRelease OK:4 http://deb.debian.org/debian stable Release Paketlisten werden gelesen... Fertig Abhängigkeitsbaum wird aufgebaut. Statusinformationen werden eingelesen.... Fertig Alle Pakete sind aktuell. Paketlisten werden gelesen... Fertig Abhängigkeitsbaum wird aufgebaut. Statusinformationen werden eingelesen.... Fertig Paketaktualisierung (Upgrade) wird berechnet... Fertig 0 aktualisiert, 0 neu installiert, 0 zu entfernen und 0 nicht aktualisiert.
root@mvps-vm1:~ # iptables -L --line-numbers -n Chain INPUT (policy ACCEPT) num target prot opt source destination 1 ACCEPT udp -- 127.0.0.1 0.0.0.0/0 udp dpt:53 2 ACCEPT tcp -- 127.0.0.1 0.0.0.0/0 tcp dpt:53 3 [DOMAIN 1] all -- 0.0.0.0/0 0.0.0.0/0 [...] 22 DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:53 23 DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:53 24 DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:161 25 DROP udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:162 26 DROP tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:5666
thanks for your help