i have a nextcloud instance on a shared web server, and recently two of my phone apps connected to this server told me there is a problem with the X509 certificate, the message was in french so the following is just a translation :
an unknown certificate was detected
please validate the new certificate :X509 details of certificate:
delivered for :
[2]nextcloud.hugulumu.fr
[2]www.nextcloud.hugulumu.frdeliver by :
CN=R3, 0=Let’sEncrypt, C=USperiode of validity :
august 25 2021 – november 23 2021 (will not be applied)fingerprint :
SHA1:
SHA256:
i don’t know where to find the keys to compare them, but i could figure that out
my question is more about the security risk that it represent ? why would i suddenly receive this ? could it be some kind of a hack ? how can i be sure i’m not tricked by someone if i validate the new certificate ? should i somehow create a new one ? how could i know if someone has gain access to my server ?
