In the change process through SAP JVM JVM Tool Switch appeared the following error message which prevented up to the instance:

transport error 202 could not find free port in debug port range

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This error appeared in the log std_server0.out

After an analysis could determine that the error was produced because JAVA instances of my portal had the same default debug port (1024):

Instance JC01

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Instance J02


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to resolve the error and conclude with changing JVM (JVM IBM to SAP JVM) disable debug options. finally change the instance worked and went up smoothly with the new JVM.

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