Unable to Access Confluence Plugin Repository Client

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Symptoms

The plugin repository is inaccessible. The following appears in the atlassian-confluence.log:


2010-02-17 12:09:46,951 WARN [http-8080-5] [getaheadplugin.dwr.impl.ExecuteQuery] warn Method execution failed:
 -- referer: http://<confluence url>:8080/admin/plugin-repository/plugins.action | url: /plugins/servlet/plugin-repository/dwr/exec/RepositoryDWR.startCaching.dwr | userName: admin
com.atlassian.plugin.repository.model.RepositoryException: Error downloading: http://confluence.atlassian.com/plugin-repository/proxy.action?profile=confluence&decorator=none&buildNumber=1724&repoClientVer=2.1.6&os=x86&javaVer=1.6.0_10&javaVendor=Sun+Microsystems+Inc.
Unrecognized SSL message, plaintext connection?
	at com.atlassian.plugin.repository.datasource.ProxyDataSource.getData(ProxyDataSource.java:192)
	at com.atlassian.plugin.repository.datasource.ProxyDataSource.startCaching(ProxyDataSource.java:312)

Sometimes there will also be a connection timeout accompanied by an 'Error downloading' message in the browser:


Error downloading: http://confluence.atlassian.com/plugin-repository/proxy.action?profile=confluence&decorator=none&buildNumber=1724&repoClientVer=2.1.6&os=amd64&javaVer=1.6.0_14&javaVendor=BEA+Systems%2C+Inc.

Cause

The plugin repository client in Confluence downloads an XML file from http://confluence.atlassian.com. If the outgoing proxy of the server where Confluence is installed not allowed to download from that url, then the plugin repository client will produce a time out error.

Diagnosis

Try accessing the plugin repository destination directly using a browser from the same server where Confluence is installed.

A successful connection will result in a redirection to https://plugins.atlassian.com and an XML content returned.

Resolution

If the test failed, see Configuring Web Proxy Support for Confluence for instructions on how to set up confluence to use a proxy to access the internet. Further configurations and a patch may be required as per APR-160.


Last modified on Mar 30, 2016

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