I have the exact same issue here, on console have the following issue:
Error parsing plugins : Hostname/IP doesn't match certificate's altnames: "Host: packages.nodebb.org. is not in the cert's altnames: DNS:[domain].com, DNS:www.[domain].com"
Getting this warning when tried to change email of a user.
i even turned on the email change option, but still it gave this error to me as a admin
i have the same issue too on 1.7.5v