We are a print company that offer an online service. One of our customers has been using the service for the last few months without a problem. But from last week all their users kept getting logged out seconds after they log in. The software is running on windows 2003 standard server. I went over to the company to try and sort out the problem and while waiting for the software developers to call me back i thought i'd check my email via Kerio webmail. This sits on a Linux Redhat Enterprise 3 box. I also get sessioned out of this straight away. I can access both applications from anywhere else (home, 2 other branches, developers). Both servers sit behind a Draytek Vigor 2910 firewall. The problem only seems to oocur from this one customer! Any help would be greatly appreciated as everyone seems to be scratching their heads!