CL_GUI_FRONTEND_SERVICES hang up

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Hi Gurus

I tried to get the client computer name when executing a program though WEB GUI. Inside the program I used the class CL_GUI_FRONTEND_SERVICES, method GET_COMPUTER_NAME to get client computer name. The problem is the program get hang forever everytime it executes the method GET_COMPUTER_NAME. When trying to debug, I found that it hangs at call screen 650 in function ITS_GET_COMPUTER_NAME when the method is called.

Anybody has any idea? Do I have to install Java since I heard tjhat we have to installed Java? I searched SAP notes including SDN but no solution has been found

I already tried to use methos GET_IP_ADDRESS and function RFC_IP_TO_HOST but the computer name returned simply does not match the client computer name for some unknown reason.

Thank you for you help