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Why two ports are opened for TCMP coherence cluster in 12.2.1.x.x version by default? (Doc ID 2177904.1)

Last updated on JUNE 07, 2023

Applies to:

Oracle Coherence - Version and later
Information in this document applies to any platform.


The documentation says that the second port (port2) is automatically opened and defaults to the next available port after port1 (port1 + 1 if available). Automatic port adjustment can be disabled; in this case, port1 must be available and the second port is always port1 + 1. Automatic port adjustment can also be used to specify the upper limit of the port range. But the second port is not automatically opened as per the manual on Coherence 12.2.1. It was opened as an unpredictable port, even if coherence.localport.adjust was set to false.(-Dcoherence.localport.adjust=false). What is this random second port?



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