FM CRYPTOGRAPHIC ERROR

[Cognos8]

When i change the  disptacher URL in cognos config and did save i got the below  error. i did following steps.
1- deleted the singlekeypair and CSK folder.
2- export other cogstartup.xml , which is working fine and placed.
Both above step did not help. is there any java files need to be deleted?

Error-1---
CAM-CRP-1132 An error occurred while attempting to request a certificate from the Certificate Authority service. Unable to connect to the Certificate Authority service. Ensure that the Content Manager computer is configured and that the Cognos 8 services on it are currently running. The HTTP result code '401' was returned from the server.

Error-2---
  CAM-CRP-1280 An error occurred while trying to decrypt using the system protection key. Reason: javax.crypto.BadPaddingException: Given final block not properly padded