Xqe-jdb-0001 Problem Establishing Connection. Please Check The Database Server - [repack]

Troubleshooting Guide: Error xqe-jdb-0001 (Problem Establishing Connection)

Ping & Telnet:

From the Cognos application server, ping the database server and use telnet to confirm the port is open and listening.

If at limit:

Preventive Measures & Best Practices