j2ee service does not start

we are running WAS 6.20 on windows platform. I have problem bringing up the j2ee service.

The parameter for automatic startup is already set and the path to the go.bat is also correct.

I tried execting the go.bat and encountered below error.

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C:\usr\sap\CFP\D00\j2ee\cluster\dispatcher>go.bat

SAP J2EE Engine Version 6.20 SP1 is starting...

Loading: LogManager ...

Loading: R3StartupManager ...

[R3StartupManager]: ID000701: Couldn't start r3startup manager. Exception is : Cannot assign

equested address: connect

Loading: R3StartupManager returned false!

Kernel not loaded. System halted.

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any suggestions are most welcome

Srinivas