hi to all. when i work at my isa server, i see my connection to lan goes up-down-up-dpwn-up-down... i don't understand why! my isa server is w2k server english, sp3, sp1 for isa, all windows critical update, 3 nic (1 public - 172.24.x.y/16 - 172.16.x.y/16 with problem...) all nic are 3com, 2 hd scsi mirrorin hardware (mylex). i tried to change the nic, but the problem is persistent :-( the cable of 172.16.x.y go to a switch (it same with no problem) any idea? thank you in advance, gg