Communications Link Failurelink

Updated 11 days ago

Questionlink

A database connector is failing with the following error in the dashboard:

 com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure\\n\\n  
 The last packet sent successfully to the server was 0 milliseconds ago.  
 The driver has not received any packets from the server.
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Environmentlink

Database Connectors

Answerlink

To troubleshoot, do the following:

• Check if your Firewall settings have changed and now prevent Fivetran from accessing.

• Check if your database is blocking Fivetran's access through permission changes.

Causelink

The connector is unable to establish a connection with the source database. This can happen when the database's firewall settings have changed.

For MySQL, the error visible on the dashboard is a secondary error to:

Lost connection to MySQL server at reading initial communication packet, system error: 0