Firstly, may I apologise, I am quite clearly not a great tech guy, self taught and using goole has brought me to make some monumental errors here!
I have scoured this site and followed various advice, which has just made the web tangle a little further.
So here is the abridged version of events/ what has happened.
Applied SSL to all sites, everything is fine - did this via plesk installation. No issues, - renewed all sites to allow for with and without www. still no issue.
Tried to apply SSL for server. lots of issues here.
Created subdomain to match server hostname - created re-direct to actual domain.
Created SSL for this.
All is still fine.
Create server wide cert - Still get the “ERR_COMMON_NAME_INVALID” assume this is due to the cert not being linked to the IP address but the hostname.
All hosted sites fall into Error 502 - this is solved by regenerating core files.
Read on here about installing certbot - undertake these actions.
All appears fine - try regenerating server cert.
All drop to Error 502 and I now get Max No of Certs.
Yes I have well and truly made a mess on this one! Any guidance would be appreciated as to how to untangle this!
Ideally trying to get server https and all domains.
Yes I have access to SSH.
Server is running Plesk on CentOS7
Running: NGINX with Apache (on FastCGI )
As I say, any assistance would be super appreciated!