Failing to obtain http://master:8081/computer/slavecomputername/slave-agent.jnlp

[Victoria Wei Lei]

Due to our corporate security policy,  my jenkins slave computer is in an isolated network, with firewall to master.  I use fixed TCP port (8082) for JNLP agents, IT opened that port. 

tried to launch agent: java -jar agent.jar -jnlpUrl http://ca2-coverity:8081/computer/ca2-buildpc2-dc/slave-agent.jnlp

Failing to obtain http://ca2-coverity:8081/computer/ca2-buildpc2-dc/slave-agent.jnlp

java.net.ConnectException: Connection timed out: connect

        at java.net.DualStackPlainSocketImpl.connect0(Native Method)

        at java.net.DualStackPlainSocketImpl.socketConnect(Unknown Source)

        at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)

        at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)

        at java.net.AbstractPlainSocketImpl.connect(Unknown Source)

        at java.net.PlainSocketImpl.connect(Unknown Source)

        at java.net.SocksSocketImpl.connect(Unknown Source)

        at java.net.Socket.connect(Unknown Source)

        at java.net.Socket.connect(Unknown Source)

        at sun.net.NetworkClient.doConnect(Unknown Source)

        at sun.net.www.http.HttpClient.openServer(Unknown Source)

        at sun.net.www.http.HttpClient.openServer(Unknown Source)

        at sun.net.www.http.HttpClient.<init>(Unknown Source)

        at sun.net.www.http.HttpClient.New(Unknown Source)

        at sun.net.www.http.HttpClient.New(Unknown Source)

        at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)

        at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(Unknown Source)

        at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)

        at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)

        at hudson.remoting.Launcher.parseJnlpArguments(Launcher.java:490)

        at hudson.remoting.Launcher.run(Launcher.java:322)

        at hudson.remoting.Launcher.main(Launcher.java:283)

Waiting 10 seconds before retry

from slave computer,  I am not able to launch Jenkins web interface via ca2-coverity:8081. 

what is the problem? 

Thanks

Victoria 

[Avinash Desireddy]

Victoria,

Looks like the Jenkins server is not reachable from the agent machine.

Check if ca2-coverity is reachable from the agent node.

    - DNS resolution by performing $ nslookup on the hostname

If DNS resolution is successful, verify the incoming & outgoing ports 

IT has opened the ports, but check if there are multiple layers where port should be opened between client & server.

-Avinash

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[Victoria Wei Lei]

Hi, Avinash, 

Thank so much for the hint. I did know Jenkins server was not reachable from my agent machine. At the moment, in order to avoid interrupting the coming release work,  we had to move the Jenkins server back to the same network as agent.  Once we complete the task,  will experiment with what you suggested and update. 

I appreciate your help. 

Best

Victoria 

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