What Is My VNC Server Port?

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    Normal action

    • When a user launches a VNC Client, they will enter an IP Address of the VNC Server and have to provide a log in password. During the initial connection establishment, the VNC Client will use port 5900 across the network to verify the provided credentials. Once the VNC Server and VNC Client have correctly created a connection, the VNC Client user can manipulate the remote server as if they were directly in front of the computer.

    Errors or problems

    • During the connection process, errors may possibly be presented. Typical errors like, connection refused, connection closed unexpectedly or connection failed may be presented. If any of these problems arise, then you'll need to trouble shoot one of several potential problems. Port assignment, network connectivity, firewalls and passwords are the most common issue.

    Network Issues

    • The most common concern is network connectivity. Depending on where the VNC Client and VNC Server are located, they require direct network access by both IP address and port. If routers and firewalls are in between these two locations, the IP addresses may not connect properly or port 5900 may be blocked, requiring this to be modified. Port reassignment. Some VNC Servers allow the default port, 5900 to be changed. Double check that this is not the case. If the default port has been modified, then change the client settings.

    Server Issues

    • Password authentication is another common problem. If networking is not an issue, then double check that the password is correct. VNC Server is not running. Some variations of VNC require that the server run as a stand alone application and it may simply not be running or configured. VNC Server may have crashed. Double check that the VNC Server and VNC Client versions are compatible.


    • VNC is a great software tool for remotely managing computer devices. Administrators and home users alike can benefit from VNC as it's relatively inexpensive or free in most cases. Some operating systems have a VNC Server built in, such as Linux, Unix and OSX. Setup is relatively easy and connectivity has low impact on networks. While some functionality is limited, for the majority of users, VNC will suffice as a remote management tool.

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