I'm using ISA Server 2003 and I can't connect to VNC Server on another network.

This potentially affects all versions of Microsoft ISA Server, but we've only encountered it with ISA Server 2003. Your ISA Server may be configured to "police" the outbound connections of your network, essentially meaning that it's acting as a firewall for everything that attempts to go out of your network, as well as come in.

This can be resolved by setting the following options on your ISA Server:

• Protocol Definition: "VNC Viewer", Port 5900, TCP, Outbound
• Client Address Set: "VNC Clients", Specifying IP address of clients who wish to connect to VNC Servers
• Destination Set: "VNC Servers" specifying the VNC servers you wish to connect to (IP address).
• Protocol Rule allowing "VNC Clients" to use "VNC Viewer" protocol
• Site and Content Rule "VNC" allowing "VNC Clients" access to "VNC Servers"

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