Jenkins won't start after plugin update?

[Michael Carter]

I was testing out my new changes to my plugin.   Did update all on all plugins.

Did systemctl restart jenkins.

Now starting I get: 

2021-04-26 16:08:28.416+0000 [id=86] INFO hudson.model.AsyncPeriodicWork#lambda$doRun$0: Finished Download metadata. 461 ms

2021-04-26 16:08:28.941+0000 [id=34] INFO jenkins.InitReactorRunner$1#onAttained: Completed initialization

2021-04-26 16:08:29.077+0000 [id=22] SEVERE hudson.util.BootFailure#publish: Failed to initialize Jenkins

java.net.SocketException: Permission denied

at sun.nio.ch.Net.bind0(Native Method)

at sun.nio.ch.Net.bind(Net.java:444)

at sun.nio.ch.Net.bind(Net.java:436)

at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:225)

at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)

at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:67)

at hudson.TcpSlaveAgentListener.<init>(TcpSlaveAgentListener.java:100)

at jenkins.model.Jenkins.launchTcpSlaveAgentListener(Jenkins.java:1298)

at jenkins.model.Jenkins.<init>(Jenkins.java:985)

at hudson.model.Hudson.<init>(Hudson.java:85)

at hudson.model.Hudson.<init>(Hudson.java:81)

at hudson.WebAppMain$3.run(WebAppMain.java:295)

Caused: hudson.util.HudsonFailedToLoad

at hudson.WebAppMain$3.run(WebAppMain.java:312)

2021-04-26 16:08:29.169+0000 [id=22] INFO jenkins.model.Jenkins#cleanUp: Stopping Jenkins

Tried disabling the plugin in question, disabling all nodes, copying over the jenkins.war file sync'ing the plugin directory from a working setup.... 

how do I track down the main cause?    

The other two servers I have using the same setup works fine so I'm assuming some file got corrupted somewhere.

[Gavin Mogan]

Permission denied sounds like your either using a port that is already used, or using below 1024. I don't think either are plugin related per say.

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[G. Michael Carter]

Funny never fails, searching for an answer on and off since Apr 20th...5 minutes after asking for help... actually found it... (was what you were basically saying) 

Turns out one of the other developers/admins quietly changed the slaveAgentPort port and didn't tell anyone.   When I asked in our team meeting everyone said they hadn't changed anything in months.   Someone lied.   Too bad this only tracks the user as "SYSTEM"... think people forget we have this thing enabled... good thing too.

2021-04-18_17-00-25/config.xml:  <slaveAgentPort>45001</slaveAgentPort>
2021-04-19_09-46-03/config.xml:  <slaveAgentPort>443</slaveAgentPort>

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G. Michael Carter
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