Windows 7 slave-agent.jnlp error: "Unable to launch application" ( FailedDownloadException: Unable to load resource ) ?

Ed of the Mountain

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Aug 25, 2014, 10:42:41 AM8/25/14

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I am setting up a new Jenkins build server and slaves at my new company. I tried three different methods to launch from slave. I tried disabling Windows 7 firewall.

When I use the "Launch" button from browser on slave I get an "Application Error" saying "Unable to launch the application". See details below.

<title>Slave Agent for esuttonwin7x32</title>

<vendor>Jenkins project</vendor>

</information>

<all-permissions/>

</security>

</resources>

<application-desc main-class="hudson.remoting.jnlp.Main">

<argument>esuttonwin7x32</argument>

</application-desc>

</jnlp>

com.sun.deploy.net.FailedDownloadException: Unable to load resource: http://127.0.0.1:8080/jnlpJars/remoting.jar

at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)

at com.sun.deploy.net.DownloadEngine.downloadResource(Unknown Source)

at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)

at com.sun.javaws.LaunchDownload$DownloadTask.call(Unknown Source)

at java.util.concurrent.FutureTask.run(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

java.net.ConnectException: Connection refused: 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 sun.net.NetworkClient.doConnect(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.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)

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

at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.AccessController.doPrivileged(Unknown Source)

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

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

at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source)

at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.security.AccessController.doPrivileged(Unknown Source)

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

at com.sun.deploy.net.HttpUtils.followRedirects(Unknown Source)

at com.sun.deploy.net.BasicHttpRequest.doRequest(Unknown Source)

at com.sun.deploy.net.BasicHttpRequest.doGetRequest(Unknown Source)

at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)

at com.sun.deploy.net.DownloadEngine.downloadResource(Unknown Source)

at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)

at com.sun.javaws.LaunchDownload$DownloadTask.call(Unknown Source)

at java.util.concurrent.FutureTask.run(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

Everything is running in a VM including the Jenkins master and slave:

Master: Jenkins 1.576 ( Ubuntu 14.04 LTS)
Master: java version "1.7.0_65"
Slave: Windows 7 x32
Slave: java version "1.8.0_05"

The following two commands fail to connect to server from slave:

javaws http://127.0.0.1:8080/computer/esuttonwin7x32/slave-agent.jnlp
java -jar slave.jar -jnlpUrl http://127.0.0.1:8080/computer/esuttonwin7x32/slave-agent.jnlp

Any tips or suggestions are much appreciated,

-Ed

Scott Evans

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Aug 25, 2014, 10:53:10 AM8/25/14

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Ed,

I would guess you have your Jenkins server configured to be considered at 127.0.0.1 (i.e. loopback) and so any referece to it from other machine (i.e. slaves) are trying to hit 127.0.0.1 for the URL which (since it's the loopback address) is trying to contact to itself rather than the master. I'd suggest looking in your jenkins master configuration and looking at the Jenkins Location URL. My guess is that it's pointing to 127.0.0.1. Change that to the actual ip/name of your Jenkins server and then the launch urls should be correct.

Scott

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Eddie Sutton

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Aug 25, 2014, 10:54:20 AM8/25/14

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Never mind. Sorry for the noise.

https://wiki.jenkins-ci.org/display/JENKINS/Windows+slaves+fail+to+start+via+JNLP

Go to Jenkins->Manage Jenkins->Configure System

Search page for 127 and replace 127.0.0.1 with server's actual IP address.

-Ed

On Mon, Aug 25, 2014 at 9:42 AM, Ed of the Mountain <edsu...@gmail.com> wrote:

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Eddie Sutton

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Aug 25, 2014, 10:55:46 AM8/25/14

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Thank you Scott. Your guess was correct.

Thank you for your patient and informative reply!

-Ed

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olivier Noumbi

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May 19, 2020, 4:35:16 PM5/19/20

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Hey Ed

I change the master ip address in the config but I am still getting this error:

com.sun.deploy.net.FailedDownloadException: Unable to load resource: http://11.16.114.193:31763/jnlpJars/remoting.jar

at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source)

at com.sun.deploy.net.DownloadEngine.downloadResource(Unknown Source)

at com.sun.deploy.cache.ResourceProviderImpl.getResource(Unknown Source)

at com.sun.javaws.LaunchDownload$DownloadTask.call(Unknown Source)

at java.util.concurrent.FutureTask.run(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

Note that 11.16.114.193 is my master IP address. Any suggestions please?

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makafui cudjoe

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May 21, 2020, 4:04:22 PM5/21/20

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Hi Olivier,

Can you confirm the port number 31763 is what Jenkins is configured to listen on ?

You also need to check if you are able to reach the master IP from the agent node. You can perform some ping test.

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