I’ve read many threads about this issue but it seems that there is no one solution. I have successfully set up a certificate for and [removef]. After that I installed gitlab on my server which is accessable under the subdomain . I tried to expand the certificate for this subdomain but get the error
DNS problem: SERVFAIL looking up A for …
I did some troubleshooting using dig, nslookup and checked various dns propagation checkers online and it seems more or less fine (3 failures on the online propagation check but they show failed also for the domains that are working fine).
I’m not too familiar with DNS so I hope someone can run some more extensive tests and let me know what is wrong. My registrar and DNS hoster is namecheap.
Thanks in advance,