Hello, i got the same problem.
I think Cryptpad was fully accessible shortly after setting up Pangolin. Unfortunately, this was no longer the case a day later.
The "Startpage" can be accessed by Domainname (cryptpad.<xxx>.de), but none of the subpages (cryptpad.<xxx>.de/sheet/). At least not with the domain name. It only works with the server IP.
Could it be related to the Let's Encrypt certificate?
I would like to try the solutions suggested above.
Unfortunately, I don't know where to make these settings.
Sorry, I'm still quite new to Docker and Co.
Thanks in advance!