The database server itself might be down, or network restrictions (firewalls/security groups) might be blocking the connection from the Cognos server. 2. Database Server & Connectivity Checks
Have you encountered this error before? Did you find a solution not listed here? Let us know in the comments! The database server itself might be down, or
But Nora didn’t believe in ghosts. She believed in packet traces. She ran tcpdump -i eth0 port 5432 and watched the stream. Every few minutes, a tiny SYN packet emerged from nowhere—no source MAC address she could trace, no PID on the app server—just a perfect, impossible attempt to handshake with the database on port 5432. Then: timeout. Then: the error. Did you find a solution not listed here
: Using an unsupported version of the IBM JCC JDBC driver (such as version 4.33.31 for certain Db2 connections) can trigger this error. She believed in packet traces
To avoid the error in the future, implement these practices:
Run a connection test to see if it fails for both JDBC and Native clients. :