This article describes the error and its resolution when installing GFI MailArchiver 2011 R2 or newer, or upgrading from an earlier version, the User Interface does not load, and the following error is encountered:
HTTP Error 503. The Service is unavailable
The Application Pool for GFI Archiver is stopped, and when trying to open the GFI Archiver website, IIS will not be able to access the configuration with the following error:
There was an error while performing this operation.
Error: The configuration section 'system.web.extenstions' cannot be read because it is missing a section declaration
- GFI Archiver
- Microsoft Windows 2008
- Internet Information Services (IIS) 7
After installing Microsoft .Net Framework 4, the managed runtime for this version is not registered correctly in the worker process, w3wp.exe.
Update Microsoft Windows 2008 to Service Pack 2 or later.