Known Firewall Check

 
 
 

Verify that any firewall you detect on the server does not block http port 80.

Windows XP and Windows Server 2003 Firewall Settings
Windows Server 2008 Firewall Settings
Windows 7

If you are using SSL with Autodesk Vault server, make sure that port 443 is also on the list of programs and services not being blocked. If it isn't, repeat the steps for port 443.

If a third-party firewall is in use, verify that it is configured to allow access on port 80 (and port 443, if you are using SSL). Also, verify that the firewall is configured to allow you to connect to your DNS server and to the host.