WordPress Speed Up Service | WordPress Website Maintenance Packages Reply To: Server Error 500 on version 4.7, by plxvandyk Hi again – I’ve tried renaming the specific theme folder and replacing it with a more up-to-date version from a subdomain site that is working fine, to no help. the DB credentials are fine in the config file, but I found that I can’t get into the DB back-end either as I get the same server error… Reply To: Server Error 500 on version 4.7