Today our SharePoint server raised a nice exception: ‘File not Found’ when you tried to log on. Off course we were already familiar with the sound exceptions SharePoint raises so we inspected the event log.
Error: Failure in loading assembly: Microsoft.SharePoint.Portal, Version=220.127.116.11, Culture=neutral, PublicKeyToken=71e9bce111e9429c
Error: Failure in loading assembly: Microsoft.SharePoint, Version=18.104.22.168, Culture=neutral, PublicKeyToken=71e9bce111e9429c
The solution was pretty forward, but raises the question how compatible is Microsoft with Microsoft…..
It seems that when you modify the web.config with the ASP.Net Configuration Tool, it adds an attribute (xmlns) to the <configuration> tag like so:
By removing the xmlns attribute the SharePoint the problem was solved.