In jenkins with the upcoming 7.4.10 one can notice, in a specific testsuite (undertow-integration) ,a lot of WFLYPRT0053 errors which do not exist in previous version 7.4.9 : 

java.net.ConnectException: WFLYPRT0053: Could not connect to remote+

http://127.0.0.1:9990.

The connection failed at org.jboss.as.protocol.ProtocolConnectionUtils.connectSync(ProtocolConnectionUtils.java:129)

It could be possible that this could be caused via a potential leak .....