Enterprise Manager 5.0

I would like to stop broker server. I dont have wmadminpage so I m trying to stop by going to file->properties->stop but before I could go to property I get error like Broker on failure message code 351.
I tried to stop from command promt by giving broker_stop command but
it gives message like
Initialising localhost:6850 connection timed out.
I even gave port number along with command but still it gives same error message. Please help