https://www.plesk.com/kb/support/unable-to-access-website-on-plesk-server-with-500-error-message-adodb-connection-error-800a0e7a/
Unable to access website on Plesk server with 500 error message: ADODB.Connection error '800a0e7a'...
Symptoms Unable to access example.com domain with the default 500 error message: 500 external Server Error Accessing the domain from Windows server itself...
unable to access website