Unable to connect to the Quarantine URL in GFI MailEssentials. The error "Error 404 page cannot be displayed"
all supported environments
Check within IIS that the Default Web Site is not stopped.
Open IIS Manager
Navigate to your Default Web Site and verify if it is enabled or disabled
If disabled, enable the Web Site and attempt to access the Quarantine URL again
The GFI MailEssentials quarantine uses a web interface to get into the database, and it functions like any other web site within IIS. If the site is "stopped", then it will not be able to open the quarantine URL.