Web Server

Certificates

If you make changes to a Certificate's FQDN, in addition to migrating the certificate, you must go to Control Panel / Login Portal / Advanced / Reverse Proxy. The hostname must be changed there for everything to work properly! This took half a day to figure out last time, hope it saves you some time in the future :)

PM2

If you are having issues with PM2 process manager serving the NextJs app (when sudo npm run start works fine), run: sudo pm2 delete all.

This will end all processes.

Then run sudo pm2 start npm -- start and that should cause PM2 to serve correctly.