Session closing while executing NWBC

HI All,

After my system upgrade form NW 7.02 to NW 7.3. We are facing one issue with NWBC t-code. When ever we are executing the nwbc in the abap system we are re-directing to web browser. But at the same time abap system session is closing.

Shall we need to maintain any parameter for the same.

Thanks and Regards

Rajesh