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I have this same problem when I Disable 'TCP port for JNLP slave agents' on the /configureSecurity page. Changing to Fixed or Random allows the 'help' command to complete (some other commands are failing due to separate issue, probably related to JENKINS-21086).
To reproduce on a naive installation:
Start the application:
$ java -jar jenkins.war
Test the cli jar ( war) :
$ java -jar jenkins-cli.jar -s http://127.0.0.1:8080 help
This prints the help menu. So far so good.
Then if I go to http://localhost:8080/configureSecurity/ and Disable 'TCP port for JNLP slave agents' and run the cli again I get the exception.