Please follow the below template, it will help us to help you!
Expected Behaviour:
[web gui of pihole coming up.]
Actual Behaviour:
[connection times out. i did a little test of mine. turns out fail2ban is doing this. however, this server has some functions exposed to the internet so fail2ban is mandatory for me. Notes:this server runs Open Media Vault. and the fail2ban plugin is in use. ]
And if you try another port for you pihole? Default port is 80, maybe you can try port 8080 and then open the admin webgui like this:
192.168.x.x:8080/admin/
i was able to find out what jail causes this. a jail called omv-web GUI. a jail for the open media vault admin page. its set to ports : http and https . filter is omv-webgui
my issue is resolved. i just disabled the omv-webgui jail. this would not have any effects on my security because i have set my router to block ports related to http and https. so no one from outside can even see the webGUI. thanks for your help.