Configure Firewall

If you have a firewall or a router between your cache clients (web/app servers) and the cache servers, then you must open up specific ports in your firewall. This will ensure that cache clients are able to talk to the cache servers.

NCache server uses the following TCP ports for communication.

  • Client/Server Port: 9800 (the default TCP port for cache client and server communication).
  • Management Port: 8250 (the default TCP port for PowerShell cmdlets and NCache Service).
  • Cluster Port: Cluster-port that you define in a cache cluster configuration. It is recommended to use a consecutive range of ports, (the default range is 7800-7900), and configure a Firewall to allow communication on this port range.
  • Cache Management Port: The port range for cache management. The default port range is 8300-8400.
  • SNMP Listeners Info Port 8256 the port at which SNMP listens to. NCache has now simplified the management of SNMP monitoring by supporting the publishing of counters on a single port. In previous versions, individual ports were required for each cache.


But, if there is a port conflict and the above default ports are being used by other applications then you must configure all the cache servers to use different ports.

  • Metrics Server Port: 8255 (Default TCP port for the Metrics Server). This port is configurable and can be changed in the Alachisoft.NCache.Service.dll.config file.

Step 1: Modify Cache Service configuration file

This cache service configuration file found in the NCache installation is Alachisoft.NCache.Service.dll.config located in %NCHOME%/bin/service.

Change the "Port" for Client/Server communication and "ManagementPort" for NCache management in the file below.

<appSettings>
      ...
      <add key="NCacheServer.Port" value="9800"/>
      ...
      <add key="NCacheServer.ManagementPort" value="8250"/>
      ...
</appSettings>

Step 2: Restart NCache Service

For the configuration changes made to take effect, restart the NCache Service. Make sure you have enough privileges to restart the service. If the user is not part of the Administrator's group, make sure to run PowerShell as administrator, otherwise, you might get an error message that Cannot open ncachesvc service on computer.

Execute the following command in PowerShell to restart the NCache Service:

Restart-Service -Name NCacheSvc

See Also

Run NCache Service as Administrator
Configure IP Binding in Multiple NICs