Use network ports below 49152

Ports in the range 49152 to 65535 are reserved by the Windows operating system. Windows actively uses ports within that range for its dynamic ports, also known as private ports or ephemeral ports.

If you use such a reserved port for a Zylinc-related service, there's a risk that Windows will block the port, and that the Zylinc-related service won’t be able to work correctly. If that's the case, you'll see periodic errors due to the random nature in which private ports are used by the operating system. A reboot, a service restart, or even a restart of a different service, may temporary fix the problem.

However, to permanently fix the problem, make sure that all ports that you use in your Zylinc solution are outside of the reserved port range between 49152 and 65535.

  1. In the Administration Portal menu, select INSTALL > Network Overview

  2. Check that all modules use a port that's lower than 49152 in Port1 or Port2 on Server Address for a Windows server.

    If a port number is too high, go to the respective page in the Administration Portal and reduce the port number to a value below 49152.

Zylinc solutions have historically used some ports in the range 49512 to 65535 that's reserved by the Windows operating system. Here's how you can make sure that your solution doesn't use those ports anymore:

Some of the modules listed in the following, for example ZyCore Device, are so old that they're not used in recent Zylinc versions. It's still a good idea, however, to quickly check the port numbers.

  • In the Administration Portal menu, select NETWORK > Exchange Sync Webservice. Absence Port. The original port number 49500 is too high. Reduce the port number to a value below 49152.

  • In the Administration Portal menu, select SYSTEM > Interface Configuration. Absence Address/Port (Domino). The original port number 49291 is too high. Reduce the port number to a value below 49152.

  • In the Administration Portal menu, select NETWORK > Google Sync. Access Port. The original port number 49230 is too high. Reduce the port number to a value below 49152.

  • In the Administration Portal menu, select FORWARDING > Connection Settings. Ctrl. Port. The original port number 49395 is too high. Reduce the port number to a value below 49152.

  • In the Administration Portal menu, select FORWARDING > Connection Settings. Admin. Port. The original port number 49396 is too high. Reduce the port number to a value below 49152.

  • In the Administration Portal menu, select NETWORK > BroadWorks Interworking. Callback Address (Presence) Callback Port. The original port number 49325 is too high. Reduce the port number to a value below 49152.

  • ZyCore Device. Two of the original port numbers in the configuration settings are too high (server.ports=49295,49296). Reduce the port numbers to values below 49152.

  • In the Administration Portal menu, select NETWORK > Cisco Interworking. ZyCore Device Client Port. The original port number 49295 is too high. Reduce the port number to a value below 49152. The new value must match one of the new ports in the ZyCore Device configuration settings (see in the previous).