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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