I am seeing quite a few posts regarding the DNS responder causing issues resolving network names with Snow Leopard. My issue is on an iMac with 8GB of RAM, and a brand new install of Snow Leopard. All updates are current. I have the iMac in a workgroup that is on the same subnet as the Windows domain, but not binded to AD. Accessing Windows file servers was as easy as domainname\username and password before. I was able to connect to file shares and set up aliases for the user on the iMac. The Windows file server was rebooted and now her connections to the Windows file servers are taking about 4 minutes to resolve. She also has sluggish response times working on files on that server. 3 or 4 reboots of the iMac seem to help but that is not a solution. I am going to try sudo killall mdnsresponder as suggested but would love any other suggestions on this. Thank you!