Hi all, New person to the list but a long time RH\FC user. My setup: ADSL modem/router | 5-port switch | ------------------------- | | | XP box FC2 box FC3 x86_64 box (AMD64) The FC3 Test 3 box used to be running 2003 Server and it worked fine, I have used exactly the same network settings as before. I installed FC3 last night, it seemed to install fine. When I boot it everything is fine, but when I try to browse the net or ping another machine it fails and then causes the rest of the lan to fail too (not able to browse net, log into the router, ping etc). If/when I take the FC3 machine offline everything returns to normal on the lan and the other machines can browse the net etc. I woke up this morning and thought it may have been a SMB issue, but I booted the FC3 machine and checked, SMB wasn't running and the symptoms are still the same. Does anyone have any ideas, please? Regards, Marc