Issue
Syncs are failing intermittently in the sync history chart within the connector status page. One of the following error messages appears:
- SocketTimeoutException: Read timed out.
- [Amazon](500150) Error setting/closing connection: Connection refused.
- java.net.ConnectException: Connection timed out (Connection timed out).
Environment
Destination: Redshift (connecting with an SSH Tunnel.)
Resolution
Increase the concurrent connection limit on your SSH Tunnel server.
Cause
If you are using SSHD, the MaxSessions default limit is 10.