Hello,

I am using jenkins v2.105 and jre 1.8

I am using Linux as master and IBM AIX and windows server 2K12 as slaves. we are executing nightly builds on both slaves, yesterday i have restarted Jenkins instance after that agent which are configured on windows through JNLP went offline and not coming online. below is the error it's showing on windows, anybody has any workaround for this issue then please let me know.

Aug 29, 2018 1:43:04 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Locating server among http://x.x.x.x:x/jenkins/
Aug 29, 2018 1:43:04 PM org.jenkinsci.remoting.engine.JnlpAgentEndpointResolver resolve
INFO: Remoting server accepts the following protocols: [JNLP4-connect, Ping]
Aug 29, 2018 1:43:04 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Agent discovery successful
  Agent address: x.x.x.x
  Agent port:    37091
  Identity:      51:a8:0d:a8:18:dd:db:d8:ea:18:b7:98:da:76:b2:ae
Aug 29, 2018 1:43:04 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Handshaking
Aug 29, 2018 1:43:04 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Connecting to x.x.x.x:37091
Aug 29, 2018 1:43:35 PM hudson.remoting.jnlp.Main$CuiListener status
INFO: Connecting to x.x.x.x:37091 (retrying:2)
java.io.IOException: Failed to connect to x.x.x.x:37091
 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

Could you please help me out here?

just replaced master IP with x.x.x.x.

Thanks in advance.