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Imagine you are running two IDE's, each GlassFish entry to same V2 server (therefore same HTTP monitor port and configuration). Start V2 in IDE #1 - HTTP monitor server inside IDE #1 starts up. Now stop V2 in this IDE. Start V2 in the IDE #2 -- HTTP monitor in IDE #2 tries to start up, but fails with a port binding exception because 8083 is in use (by http monitor in IDE #1, even though V2 in that IDE has been stopped). Shut down IDE #1 -- Restart V2 from within IDE #2 - HTTP Monitor in IDE #2 stays silent -- probably because once it fails to start, no retries are ever made. Resolving this requires shutting down both IDEs and restarting everything again. I think we can do much better than this for user experience. At least a shutdown of IDE #1 and then a restart of V2 should have caused IDE #2's monitor to work properly.
Accepted, valid bug. No time to fix for 6.1 - setting TM to future.
No other reports about this issue, so it does not seem to be a big problem. Downgrading to P4.