Thanks everyone for feedback. This could be something weird with the xen network-interface bridging. This problematic server-system is the only xen guest that shares *both* network cards on the machine. I asked my upstream ISP to check things from their side. I hope I will soon get a ssh account on some client where the error is reproducible. Then I could start testing. - Jussi -- Jussi Hirvi * Green Spot Topeliuksenkatu 15 C * 00250 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi at greenspot.fi * http://www.greenspot.fi