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Thank you for experient replies. Yes, we have server address for server businesses, I don't know exact details, as I've never installed...

I found some info on the internet saying it might be a BIOS issue, like not recognizing drives during reboot but I doubt that, as server...

Warnings of some sort would be great, no doubt. But I am also concerned when an update actually changes the configuration. I get that...

Contact your ISP on the matter.

OK. I will open a ticket to my ISP for unblocking UDP 53 port. I will write the result here. If you have any idea for solving this...

Might have to contact your ISP then and request them open port 53 udp if they haven't yet opened it. I am not getting anything here...

I got this answer inside server root@emre:/# dig +notcp A elektrikakademi.com @95.70.147.170 ; <<>> DiG...

Yes. 53 is already in there.

commands used to detect it can be seen in the post #11

Also (And i'm sure you have) check your CSF installation to make sure that port 53 is opened UDP and TCP on ipv4 and ipv6. This can be...

commands used to detect it can be seen in the post #11

How can I check whether my ISP or something else blocks UDP 53

Learn on how to filter traffic then https://www.tcpdump.org/manpages/tcpdump.1.html see #11

OK, I went deeper. And here is what I found: The ISP used to block TCP requests to DNS, and now they opened it: # dig +tcp A...

Learn on how to filter traffic then https://www.tcpdump.org/manpages/tcpdump.1.html see #11