I have a standard Windows 2003 domain with 3 domain controllers and one member server - all Windows 2003 and all updated to the same SP and update via WSUS. Recently I started putting VIsta workstations on the network and noticed that they cannot communicate with the member server - can't ping it by IP, Netbios name, or FQDN. The FQDN does resolve to an IP - but there's no response from server. On the server I can ping the workstations but can't open the default shares on the workstation.
The Vista workstations all have Vista Business Ed - updated to the same level. All are dells but different models. Have either Intel or Broadcom 64 bit NICS. Windows firewall is disabled. All have Norton Internet Security 2009 installed - disabling that firewall causes the workstations to lose port 80 access and the server to no longer be able to ping them.
I've gotten it to the point where the workstation can intermittently connect to the server - but its like every hour for 1 minute and then nothing.
So any thoughts, comments, suggestions?