can only log on to opmanager fron the server

can only log on to opmanager fron the server

I have opmanager running on a 2003 server and i can use the web interface to access opmanager fine. but when i try to log on using my xp desktop it just says page cannot be displayed. this worked before. I'm not sure if there is a serice that needs to be running or what is going on. any help would be appreciated.

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