What to do if the domain name of one of my webserver, that me and some lab members use for work related stuff, is no longer resolved by our university DNS?
When I first noticed it, I could see no resolution at all while now the domain resolves to a wrong IP. The site can be normally reached on any other network so there is no problem on my side I think.
Should I just wait (now more than 24 hours) or should I try anything? I am entitled to complain to our IT even though the issue is only with this not-really-professional FreeDNS subdomain?
EDIT: apparently some automatism marked this domain as malicious (absolutely it is not, not willingly and not compromised) and somehow DNS resolves to CNAME sinkhole.paloaltonetworks.com.
I would probably send along the output of dig your.domain @uni-ip and dig your.domain @8.8.8.8 and dig your.domain @1.1.1.1 and dig your.domain @your-domains-authoritative-dns-server if you have that or some similar DNS client tool installed that allows direct requests to specific servers. If you don’t know the authoritative DNS servers for your domain, those are the ones in the NS records.
Are you hosting a service that is not under your organizations official domain or something? It is common security practice to block newly created domains which may be why your domain is blacklisted if you only recently stood it up.
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I would probably send along the output of
dig your.domain @uni-ipanddig your.domain @8.8.8.8anddig your.domain @1.1.1.1anddig your.domain @your-domains-authoritative-dns-serverif you have that or some similar DNS client tool installed that allows direct requests to specific servers. If you don’t know the authoritative DNS servers for your domain, those are the ones in the NS records.Nice, I am routed to sinkhole.paloaltonetworks.com I am a malicious domain apparently.
Are you hosting a service that is not under your organizations official domain or something? It is common security practice to block newly created domains which may be why your domain is blacklisted if you only recently stood it up.