10/13/22, 10:38 PM JBoss EAP 7 fails to connect to Apache httpd/mod_cluster due to a bad source port caused by port-offset - Red Hat Custo...

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JBoss EAP 7 fails to connect to Apache httpd/mod_cluster due to a bad source port caused by port-off...

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$ SOLUTION VERIFIED - Updated May 28 2020 at 10:53 PM -

Red Hat JBoss Enterprise Application Platform (EAP) 7 mod_cluster

JBoss fails to connect to Apache httpd/mod_cluster due to permissions issues like the following:

It starts successfully as root

JBoss fails to connect to Apache httpd/mod_cluster due to "java.net: Cannot assign requested address (connect failed)" like the following:

English

ERROR [org.jboss] (UndertowEventHandlerAdapter - 1) MODCLUSTER000043: Failed to send INFO command to 127.0.0.1/127.0.0:6666: Permission denied (Bind failed)

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10/13/22, 10:38 PM JBoss EAP 7 fails to connect to Apache httpd/mod_cluster due to a bad source port caused by port-offset - Red Hat Custo...

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Product(s) Red Hat JBoss Enterprise Application Platform Component httpd jbossas

Category Troubleshoot

Tags apache eap jboss jboss_eap load_balancing mod_cluster

I suspected ephemeral port exhaustion but I could not see such exhaustion from netstat output.

Update to EAP 7 CP 8 or later.

Remove source-port="0" fixed-source-port="false" setting (the bad source-port setting) or give it a usable port number (greater than 1024 for non-root users):

setting for the mod_cluster proxy has source-port="0" fixed-source-port="false" setting but the port-offset feature changes the source port from ephermeral port to some bad port:

This issue is reported in the following JIRAs:

Upstream: [WFCORE-2026] source-port is wrongly offsetted when configured to 0, i. ephemeral port; results in "Permission denied (Bind failed)" - JBoss Issue Tracker EAP 7.1: [JBEAP-7433] Mod cluster not working with non-root user - JBoss Issue Tracker EAP 7.0: [JBEAP-12241] GSS Mod cluster not working with non-root user

ERROR [org.jboss] (UndertowEventHandlerAdapter - 1) MODCLUSTER000043: Failed to send STATUS command to 127.0.0.1/127.0.0:6666: Cannot assign requested address