mod_cluster fails sending requests to Tomcat when using a connector executor

Solution Verified - Updated -


  • We're running JBoss EWS Tomcat fronted by Apache httpd via mod_cluster. We can see from the logging and mod_cluster-manager page that httpd and tomcat are successfully connecting:

    Auto Refresh show DUMP output show INFO output
    Node worker1 (
    Enable Contexts Disable Contexts
    Balancer: mycluster,Domain: ,Flushpackets: Off,Flushwait: 10000,Ping: 10000000,Smax: 1,Ttl: 60000000,Elected: 1,Read: 21645,Transferred: 451,Connected: 0,Load: -1
    Virtual Host 1:
    /, Status: ENABLED Disable
    /manager, Status: ENABLED Disable
    /docs, Status: ENABLED Disable
    /examples, Status: ENABLED Disable
    /host-manager, Status: ENABLED Disable
  • Requests through Apache/mod_cluster to Tomcat immediately fail with 503s, however, and the logging says all workers are in error state:

    [debug] mod_proxy_cluster.c(1253): proxy: byrequests balancer FAILED
    [error] proxy: CLUSTER: (balancer://mycluster). All workers are in error state


  • JBoss Enterprise Web Server (EWS)
    • Apache httpd
    • mod_cluster 1.0.10.GA_CP01 or later
    • Tomcat

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