Webgui doesn't work from the Remote place.

Hello, would you be so kind to help me in my problem.

I have sap web as 7.00, and i have published a service for using "sap gui for html" via browser from the Remote Place.

http://........./sap/bc/gui/sap/its/webgui

icm/server_port_0 i made 80 in the profile

(icm/server_port_0 = PROT=HTTP,PORT=80).

But there is such a problem.

When u try to connect using this url it gives u the log on screen to enter your user/password (it is possible even to change it!

Does anybody know what can be the solution of this problem?