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  1. Jenkins
  2. JENKINS-5177

Hudson startup fails when (udp) port 33848 is in use.

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    • Icon: Bug Bug
    • Resolution: Fixed
    • Icon: Major Major
    • core
    • None

      After upgrading to 1.339 Hudson startup fails when udp port 33848 is in use (e.g. because another Hudson instance is running). When this happens any Hudson page shows the following error:

      java.net.BindException: Address already in use
	at java.net.PlainDatagramSocketImpl.bind0(Native Method)
	at java.net.PlainDatagramSocketImpl.bind(PlainDatagramSocketImpl.java:82)
	at java.net.DatagramSocket.bind(DatagramSocket.java:368)
	at java.net.MulticastSocket.(MulticastSocket.java:147)
	at java.net.MulticastSocket.(MulticastSocket.java:112)
	at hudson.UDPBroadcastThread.(UDPBroadcastThread.java:58)
	at hudson.model.Hudson.(Hudson.java:606)
	at hudson.WebAppMain$2.run(WebAppMain.java:224)

      Before 1.339 the following warning was logged: 

      WARNING: Failed to listen to UDP port 33848
java.net.BindException: Address already in use
        at java.net.PlainDatagramSocketImpl.bind0(Native Method)
        at java.net.PlainDatagramSocketImpl.bind(PlainDatagramSocketImpl.java:82)
        at java.net.DatagramSocket.bind(DatagramSocket.java:368)
        at java.net.MulticastSocket.<init>(MulticastSocket.java:147)
        at java.net.MulticastSocket.<init>(MulticastSocket.java:112)
        at hudson.UDPBroadcastThread.run(UDPBroadcastThread.java:61)

      As a workaround I've set -Dhudson.udp=33849 which avoids this issue altogether.

            Unassigned Unassigned
            avee0 avee0
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              Created:
              Updated:
              Resolved: