VNC^® Viewer for iOS

Troubleshooting connections

Note: These instructions are likely to apply irrespective of which VNC-compatible Server technology you are using.

If you cannot connect, check the following.

• On the computer you want to control:
1. Is it turned on and connected to a network to which your iPhone or iPod touch can also connect (for example a Local Area Network, or the Internet)?
2. Is VNC-compatible Server technology running on the computer? See how to start VNC Server.
3. Is the VNC-compatible Server configured correctly? If you are using VNC Server, the VNC Server Status dialog displays a green tick if it is ready to receive connections.
4. Are you sure you have the correct address? See how to find this out for VNC Server.
5. If you are connecting over the Internet, have you configured firewall(s) protecting the computer to allow network communications through to the port on which the VNC-compatible Server is listening? Find out more about this.
6. If you are connecting over the Internet, have you configured router(s) to forward network communications to the port on which the VNC-compatible Server is listening? Find out more about this.
• On your iPhone or iPod touch:
1. Is a network available (Wi-Fi or a 3G/GRPS/EDGE mobile data network)?
2. In the VNC Viewer application, have you entered the address correctly? If the computer is running VNC Server and it is listening on a port other than 5900, have you appended two colons and the port number to the IP address? Find out more about this.
3. Have you entered authentication credentials correctly, if prompted to do so?
4. If the computer is running VNC Server, did you enter the authentication credentials of an authorized computer user? By default, VNC Server specifies password-native authentication, which means you should be able to connect by specifying the user name and password you normally use to log on to the computer. However, your user name may not have been added to the authorization list.

Providing you have the necessary permissions on the computer, you can add yourself to the authorization list, or you can change the authentication mechanism. See the VNC Enterprise Edition User Manual for more information.

5. If the computer is running VNC Server, did you tap Yes to acknowledge the VNC Server signature (a message that appears the first time you connect)? Tapping No cancels the connection request.

If the computer is running VNC Server and you still cannot connect, try the Troubleshooting connection section of the VNC Enterprise Edition User Manual, available here, or the Support pagescontact Support. Visit www.realvnc.com for more information.

If you are using VNC-compatible Server technology from a third party, consult the manufacturer's documentation.