Symptoms
Clicking "Browse database manager" in CP throws 404 error, after a few minutes the error disappeared, but then some time later it comes back.
The error is generic:
HTTP Status 404 - /index.php
type Status report
message /index.php
description The requested resource (/index.php) is not available.
Apache Tomcat/7.0.29
Also at the time this mysql error happens, the postgresql equivalent (link to phppgadmin) also errors:
"Attempt to connect with invalid server parameter, possibly someone is trying to hack your system"
A new LB node was recently added to the NG cluster.
Cause
A comparison between config files on the load balancer nodes of the NG Cluster for phpPGAdmin and phpMyAdmin, shows two missing files on the newly added node:
/usr/local/pem/sysvhosts/phpMyAdmin4/config.inc.pem.php
/usr/local/pem/sysvhosts/phpPgAdmin/conf/config.inc.servers.php
Resolution
Please copy the contents of the two files from the other nodes and re-check the access to panels.