Unable to access service at URL

[GIAM_507]

Hi,

Everything was running fine until yesterday, while opening Transformer, framework Manager, it gets stuck at the logon part where it takes a long time verifying security settings and I get the error message - 'unable to access service at url'.
As cognos admin, I am unable to log into report studio either.
If I run as normal user, it is working fine.

And I have not made any changes to the Cognos configuration.

Anyone experienced the same problem?
Hope someone can help.