: Missing or incompatible JDBC driver .jar files.
The JDBC driver files ( .jar ) in the /drivers directory are missing, corrupt, or incompatible with the database version. : Missing or incompatible JDBC driver
Navigate to your Cognos server installation directory (typically \drivers ). Use the same credentials from a different tool
Use the same credentials from a different tool (like DBeaver, SQL Developer, or psql ). If that fails, the issue is on the database side—reset the password or check if the account is locked. Using an outdated driver, a driver for the
Your application must have a compatible JDBC driver JAR for the target database. Using an outdated driver, a driver for the wrong database version, or failing to load the driver class will lead to connection failures.
When the error is intermittent
Sometimes the database itself rejects the connection due to internal settings.