Attempted to upgrade Jenkins from 1.653 to 2.107.3 - receiving the following error:

INFO: Winstone shutdown successfully

java.io.IOException: Failed to start a listener: winstone.Ajp13ConnectorFactory

at winstone.Launcher.spawnListener(Launcher.java:209)

at winstone.Launcher.<init>(Launcher.java:149)

at winstone.Launcher.main(Launcher.java:354)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.

java:62)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces

sorImpl.java:43)

"jenkins.log" 43 lines, 2563 characters

Found suggested solution - which did not work:

Setting JENKINS_AJP_PORT="-1" in /etc/sysconfig/Jenkins

Appreciate assistance.