Just yesterday I had one of our users with the same error message while trying to run Host Checker connecting to a SA4500. So far it's only this one user out of about 100.
The login is running fine with Firefox, but fails with this error message when trying with IE or directly with the Network Connect utililiy.
Any ideas would be appreciated.
Removing the framework didn't work for me, but this did:
Essentially there's some hang-up with IE having too many values in a regkey causing the browser to hang up on stuff.
FWIW I was able to get HostChecker to work in FireFox.