Zebra TC8000 won't logoff from SAP ITS


I have a zebra tc8000 terminal configured for SAP ITS with Zebra Enterprise Browser 1.8

When I log in to the ITS site, I'm asked for a username and password and I enter it correctly in SAP.

The problem is that if I want to let another user enter: I use the F8 key and execute the logoff; when I open the browser I find myself already connected

I can not log off properly

Any suggestions ?

Massi !