I'm debugging a DNS resolution error for the domain
auth.otc.t-systems.com with Cloudflare's server, but got stuck. The strange thing is that the lookup succeeds/fails depending on the machine that runs the query, but I can't figure out where the configuration differs.
The failure is always with following message:
server can't find auth.otc.t-systems.com: SERVFAIL
126.96.36.199 is Cloudflare's DNS.
What I've tried so far:
nslookup auth.otc.t-systems.com 188.8.131.52on various machines:
- It fails on my machine with work & home internet (however it succeeds with Google's DNS in both cases).
- It fails on a colleagues machine with work internet.
- It succeeds in a ssh session to a remote server.
- Now I would assume that there is some strange configuration on our work internet, that causes the lookup to fail. However I don't know what I should look for and I've also found some online nslookup services that fail as well:
Any hints how I can further debug this?