Trouble Accessing Work Email Since Service Pack Was Installed

I used to be able to access my work email from home. I first log in to a
WatchGuard Authentication window, then I log in to Outlook.
Ever since the Service Pack 2 was installed, I have been unable to access my
email. I log in to the WatchGuard Authentication window, and it reads
"Authenticated", but when I type in the next address for Outlook, the page
never turns over.
I am able to access my email remotly from other computers, so I know it is
not a problem with the company end.

Can anybody suggest a way to get around this?