In my case, I accidentally added an AJP socket binding when using the standalone jboss_cli utility:
[ standalone@localhost :9990 /] /subsystem=undertow/server=default-server/ajp-listener=ajp:add(socket-binding=ajp)
This led to an "already in use" error, which prevents the launch of any application and signals a 503 error through the Apache web server.
I removed the binding:
/subsystem=undertow/server=default-server/ajp-listener=ajp:remove
And then everything worked fine.
Camilo
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