Using VPN When Synchronizing Through the Internet

It is recommended that every synchronization occur within the corporate firewall. If your deployment must support synchronization to the Internet from outside the firewall, then it is recommended that you use a VPN (Virtual Private Network). If there is a firewall on the network between the remote client and the Siebel Server, or between the VPN Server and the Siebel Server, then the port for synchronizing with the Siebel Server must be opened on the firewall, and this port must be a port other than port 80.

If you do not use a VPN connection, then it is possible that your Internet Service Provider (ISP) or another host on the router could block communication on the port that you specify for synchronizing.