Can't connect to TFS 2010

I've tried:

1. Stop Collection / Start Collection
2. Detach / Attach Collection
3. IIS Stop, Strat , Reset
4. Flush DNS
5. Reinstalled TFS

and nothing worked.

I've checked the port 8080 in windows firewall, and was allowed through the firewall but the rule was set to PUBLIC and the network is PRIVATE. Added "private" to the rule and everything works again.

Error when changing an applications Target Framework from 2.0 to 4.0

I've had a problem with Crystal Reports when changing an applications Target Framework from 2.0 to 4.0 

Error:
Could not load file or assembly 'file:///C:\Program Files (x86)\SAP BusinessObjects\Crystal Reports for .NET Framework 4.0\Common\SAP BusinessObjects Enterprise XI 4.0\win32_x86\dotnet1\crdb_adoplus.dll' or one of its dependencies. The system cannot find the file specified.

Resolution:
Add the following to app.config:

<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime Version="v4.0" sku=".NETFramework, Version=v4.0" />
startup>

System: VS 2010, Crystal Reports 13, Windows 7 x64