Communications Link Failurelink
Updated November 29, 2023
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.
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.
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