Overview

You receive the following error when accessing the GFI MailEssentials configuration or quarantine:

Error 404: Not Found.

The following event is logged:

Event Type: Warning

Event Source: ASP.NET 4.0.30319.0 

Event Category: Web Event 

Event ID: 1309

Environment

• GFI MailEssentials
• All supported environments

Root Cause

GFI MailEssentials is set up to use an unsupported version of .NET Framework in Internet Information Services (IIS).

Resolution

1. Open IIS.
2. Navigate to Application Pools.
3. On the right pane, locate GFI MailEssentials and check the version of .NET that it is set up to use.
4. Make sure to set it to use .NET 4.0 or higher.
5. Restart IIS and GFI MailEssentials services.