I have been running GMS1.0 for sometime, now we upgraded to GMS 2.0, it
has been working untill today when I found an error message: From the
Admin Console, under Email Accelerator, it says:

"connection error", and when looking at the details it says: "An error
occured reading console configuration from
http://Server_Name/en/admin/config.jsp?ak=584...., the system could not
validate the user information provided."

So far we have changed nothing, and it had no error message after the
upgrade. Where can I validate the user ?