Windows slaves fail to start via JNLP

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In some specific situations, when trying to instantiate a slave through JNLP, Java Web Start may raise an error saying that it's unable to run the application "Slave agent for <your machine>":

This occurs because the Hudson master node has used the loopback IP address (127.0.0.1) rather than using the standard (non-loopback) one.
This is clearly shown when going to the slave node's page in the Hudson console:

Here we can see that the IP loopback address appears several times, depicting the problem that occurs.

To fix it:

  • Go to the E-mail Notification section of the Hudson main configuration panel.
  • Set the Hudson URL using the non-loopback IP address.

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Comments (1)

 

  1. Feb 16

    Jes struck says:

    it could also be that the port hudson trying to comunicate on is blocked in some...

    it could also be that the port hudson trying to comunicate on is blocked in some firewall, because that hudson takes a new random port each time you restart it. this can be overwritten under Managed hudson -> Configure system -> Select "Enable security"
    Then u swicht TCP port for JNLP slave agents from Random to fixed and type ind the port u wish to use