Users are on one domain, connecting through a B2 firewall to a resource domain containing servers. 2 Weeks ago users started getting "Network Name is no longer available" to all of our Net Appliance servers to about 25% of their request. Access to all Windows boxes have not been affected. Reproduction of the problem has been achieved by doing a large copy of files from the client to the servers affected. Logs on the servers show successful logins, connections and no errors. A trace from the client to the B2 is not under our control. Performing the test by only mapping the drive by IP/Share and testing is completely successful. NetAppliance experts have been on site and cannot determine cause and all NetApp equipment has been swapped including cabling, NICs, etc. Problem appears to be network related.. Has anyone ever experienced something like this? Thanks!

I Had something of a similar problem (it may or may not be the case with your site) at a client site. One day they started periodically getting name resolution errors, etc. I was able to catch one PC at the time and "lo and behold" I found I was getting the wrong dhcp and dns server. Turned out one of the clients had brought in a small dsl/cable router to use it so he could have more network ports...thing is he forgot to turn off the dsl/cable services which includes: dhcp and dns to the network. So any time another client's PC started up sometimes it would go to his dsl/cable router for info rather than the network dhcp/dns and get the wrong information. It wouldn't happen all the time but it would happen some of the time. A quick check would be to do an ipconfig on a PC having the problem and seeing if it's dns and dhcp matches your network resources. D