Error: Communications Link Failure

Question

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

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.

Environment

Database Connectors

Answer

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.

Cause

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