RESOLUTION
If an application works though the 9080 port, but failed to run on 80, it is possible that Apache<->Tomcat (mod_jk) connector is not configured properly.
Make sure that the file $HTTPD_CONF_D/workers.properties which is included into $HTTPD_INCLUDE_D/zz010_psa_httpd.conf contains the following options:
worker.list=ajp13
worker.ajp13.port=9008
worker.ajp13.host=localhost
worker.ajp13.type=ajp13
worker.ajp13.port=9008
worker.ajp13.host=localhost
worker.ajp13.type=ajp13
If not, correct it and restart Apache.
If it doesn't help, check that you get an answer when run:
# telnet localhost 9008
Trying 127.0.0.1...
Connected to localhost.localdomain (127.0.0.1).
Escape character is '^]'. And if the connection to 9008 failed check that Tomcat itself is configured to listen on 9008. It should be the line in like:
<Connector port="9008" enableLookups="true" debug="0" protocol="AJP/1.3"/>
If you don't see it, run:
/usr/local/psa/admin/sbin/tomcatmng --install-psa command to configure needed by Plesk connectors.
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