Nextcloud 14 SSL Untrusted Certificate

Hello,

i recently upgraded my RaspPi to Nextcloud 14 and everything is fine. But on my Ubuntu machine i get this strange ā€œUntrusted Certificateā€ Error, when using the Nextcloud App:


The certificate is from heidi.noip.me, which is not my domain. My dynDNS is spDYN.de and i use a lets encrypt cert.
So did i get hacked or is it just some random update error? What can i do?

regards

That domain looks pretty fishy, I would assume you either got hacked or your browser has hijack-plugins installed which redirect you to some spam site or something similar. I would try to clean your server and client of any suspicous applications and addons.

I think it has something to do with my dynamic IP.
I found out, that the message popped up right at about 1 oā€™clock, which is my reconnect time.
So my dynDNS is pointing towards my old IP, but my RaspPi (which is running NC 14) has already a new IP.

So my assumption is that my old IP gets assigned to another machine and my Nextcloud Desktop client tries to connect to that machine, leading to the certificate error.

Normally the dyndns should be quite fast. However, Iā€™m not sure if you can ensure that it is so fast that you can completely avoid such a problem when a client is connected or transfers data during this change. Can you disable the disconnection or move it to a time when itā€™s less likely to have a client connected?

Not sure what the client could do except to warn about a wrong certificate.