Dear Mr Snrub, Thanks for your clear reply. Affinity is set to none. What do you mean with the following ? >It is vital that you use a layer 2 switch, or a layer 2 VLAN if it is a layer 3 switch. >Almost every NLB issue I have dealt with has been a switch/network problem. You mean the problem is related to the network and not to the nodes. I didnt approach the problem this way. Anyway I'm honder procent sure its a cisco device. I'm not sure but I think its a swich. Only I'm not sure which type. I will check this I will run the "wlbs query" Iwant aware of this utility at that time. Hope to hear from you soon. Its hard to find someone with experience on this topic. Thanks a lot. Best Regards, Shiva