What to check
An unknown-session message can follow another startup or connection error. Repeatedly reconnecting a component may leave the original failure hidden behind a later symptom. Preserve the first error and restore a clean client context.
Troubleshooting steps
- Record the earliest message, its timestamp, and the operation that preceded it before trying another connection.
- Save work and close the affected SAP client and integration processes normally, then start a new client session.
- Reconnect once. If the message returns, compare licensing and landscape logs with the original failure time.
Confirm the result
Confirm the intended company and user are active. If the failure repeats, investigate the first connection error instead of treating repeated restarts as a permanent fix.