Can someone look at this problem i have. On all domains on this server Let’s Encrypt works great but not on the domains that have port 8443 behind the url
In order for the URL to work, you would need to request certificate on hostname hosting.computerselection.nl then bind the certificate to port 8443. (Which I believe can be found on your control panel)
Maybe the names that are using port 8443 are using a different server than those that use port 443, and so even if Plesk correctly obtains certificates for them, maybe it doesn’t know how to configure them on the port 8443 server? (That’s what @stevenzhu refers to as needing to “bind the certificate to port 8443”.)
Right now both port 443 and 8443 return a valid certificate for me on that server, so I’m guessing you’ve probably already fixed the problem!