Goals and Symptoms

The following error message appears in PowerLogic SCADA (PLS) v7.10 after starting Runtime:
Cannot Open Server <ServerName>. The port is in use or an attempt was made to access a socket in a way forbidden by its access permissions.

As a result, the IO Server will not start.

Causes and Fixes

The default port used by the I/O Server is 2078. The above issue can be resolved by assigning a different port to the IO Server in the Servers > I/O Server field in the Project Editor.



For a complete list of default ports used in PLS, refer to the System Integrator Manual (search for 'default port'). Here are a few:

2075 Reports server communications
2076 Alarm server communications
2077 Trends server communications
2078 Legacy I/O communications
2082 Publish subscribe I/O server communications

To determine which ports are already in use, open a Command Prompt window and run the command 'netstat -a'. This will list all of the TCP port numbers currently in use in the system.

For additional information, refer to RESL197082.

Keywords: PLSCADA, PL SCADA, PowerSCADA, Power SCADA, StruxureWare PowerSCADA Expert, SPE 7.1, 7.2, 7.10, 7.20, net stat