Configure Inter-System Publish/Subscribe (ISPS) connectivity
- Last UpdatedApr 24, 2025
- 2 minute read
By default, the Inter-System Publish/Subscribe (ISPS) connections dictate that a system starting with a higher order character will send a connection request to the system starting with a lower order character. For example, zetaSystem will send a connection request to alphaSystem.
If a system will not accept incoming requests, then you should initiate the ISPS connection. For example, a system with a firewall blocking externally initiated connections will not accept a connection request from a system located in the demilitarized zone. Therefore, a system named UnsecureSystem would, by default, attempt to connect to a system named SecuredSystem and the connection would fail.
To configure the ISPS connectivity
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Open the Network Management Console (NMC).
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Right-click the Systems node and select Configure ISPS Connectivity.
The ISPS System Connectivity dialog appears, and includes a list of systems that you can check to initiate an outgoing connection.

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Check the system from the table that displays to initiate an outgoing connection.
For example, in the image above, the es system will send a connection request to the main system.
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Select OK.
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Restart the ISPS services on all systems that are affected by your changes.
For redundant configurations, ensure that both ISPS services are restarted.
Note: When you change the configuration of systems that cross non-trusted domain boundaries, the same change must be performed using a server on each of the systems. The system and ISPS configuration is not replicated across non-trusted domain boundaries.