I can connect over Wi-Fi, but I cannot connect over 3G or from another network

If you're able to connect over your Wi-Fi connection but not over 3G (or Edge, GPRS), or if you've not tried Wi-Fi and simply can't connect over 3G, this is because you need to configure the network where your VNC Server computer is, to allow the connection.

When connecting over your own Wi-Fi connection from your iPhone to your computer, you are on the same "internal" network - this generally means that you aren't blocked from doing things on your own network, such as connecting from one computer to another, on a specific port.

When connecting over the internet, using 3G, Edge or a someone elses Wi-Fi connection (at a different location to your VNC Server computer), you are no longer on the same network, you are now connecting "externally", over the Internet. Because of this, your home network will block all connection attempts unless you configure it correctly. This is a good thing, if it did not do this, potentially malicious users could connect to your network.




To configure your network to allow connections over 3G, please see the following article for step-by-step instructions:

http://kb.realvnc.com/questions/1

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