After installing Patch 6 i am not able to connect QC from Service Test. I got error similar to “ Could not load file or Assembly... “ etc. When i searched in the HP support i came to know that this is a known issue after installing patch 6 for ST and connecting to QC. I unintall Service Test and all the patches and REINTALLED service test and Patch 6 only.
But now i am getting different error like "Failed to login" when i tried to connect to QC from Service test.
This is a known issue with ST 11 Patch 6, basically the problem was caused by previous patches (3 - 4) who omitted to install some dlls needed on ALM/QC connection.
In order to solve this problem you need to uninstall all the accumulative patches previously installed and then install only the Service Test Patch 6, this contains all the previous fixes since it's an accumulative patch.
For more information about the known issue please refers to the following knowledge base article:
Am working in HP service test. Not able to connect QC in HP service Test getting error msg " Failure in C:\Documents and settings\duraisamyma\Local Settings\Temp\Common.ALM-Platform-Loader.msi. view log".