//free\\ — Xqe-jdb-0001 Problem Establishing Connection. Please Check The Database Server

Once you resolve the issue, update your application config and restart the app. If the problem persists, enable JDBC driver logging ( java.util.logging ) to see the exact SQL exception.

: The connection string may be pointing to the wrong port (e.g., using a non-SSL port when SSL is required). Once you resolve the issue, update your application

Several technical factors can trigger this connection failure, ranging from driver incompatibilities to environment-specific settings: | ping db-host | | 2 | Is DB port open

: Update the JDBC connection string to ensure the correct port (e.g., typically for SQL Server or the dedicated SSL port) is specified. Troubleshooting Steps Test the Data Server Connection Cognos Administration Port 1433 for SQL Server

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A firewall between the application server and the database server may be blocking the specific port required for communication (e.g., Port 1433 for SQL Server, Port 1521 for Oracle, or Port 3306 for MySQL).

| Order | Check | Command / Action | |-------|-------|------------------| | 1 | Is DB server reachable? | ping db-host | | 2 | Is DB port open? | telnet db-host 5432 | | 3 | Is DB service running? | systemctl status postgresql | | 4 | Are credentials correct? | Try logging in with psql or mysql CLI | | 5 | Has max_connections been hit? | SELECT count(*) FROM pg_stat_activity; | | 6 | Is JDBC driver present? | Search for postgresql-42.x.x.jar in app’s lib folder | | 7 | Did SSL break? | Temporarily disable ?ssl=false for testing |