Post upgarde from Jenkins 2.73.3. to 2.1073, all the windows agents were down and not able to come up.

WMI agent version = 1.3.1

We have almost tried all suggestion mentioned in forum but it did not work. All the connectivity is in place. Please help and let me know if more information is needed.

Agent logs.

Feb 06, 2020 7:37:50 AM org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver resolveFeb 06, 2020 7:37:50 AM org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver resolveINFO: Remoting server accepts the following protocols: [JNLP4-connect, JNLP-connect, Ping, JNLP2-connect]Feb 06, 2020 7:38:21 AM hudson.remoting.jnlp.GuiListener$1 runINFO: Connecting to devops.xxx.xxx:50000 (retrying:2)java.io.IOException: Failed to connect to devops.xxx.xxx:50000 at org.jenkinsci.remoting.engine.JnlpAgentEndpoint.open(JnlpAgentEndpoint.java:242) at hudson.remoting.Engine.connect(Engine.java:686) at hudson.remoting.Engine.innerRun(Engine.java:547) at hudson.remoting.Engine.run(Engine.java:469)Caused by: java.net.ConnectException: Connection timed out: connect at sun.nio.ch.Net.connect0(Native Method) at sun.nio.ch.Net.connect(Unknown Source) at sun.nio.ch.Net.connect(Unknown Source) at sun.nio.ch.SocketChannelImpl.connect(Unknown Source) at java.nio.channels.SocketChannel.open(Unknown Source) at org.jenkinsci.remoting.engine.JnlpAgentEndpoint.open(JnlpAgentEndpoint.java:203) ... 3 more