Cannot connect
Most connection problems come from the host, credentials, or transport. Use Test in the connection form to see the exact error.Connection timed out or host unreachable
Connection timed out or host unreachable
Check the host and port, and that the database is reachable from your machine (firewall, VPN, security group). If the database is behind a bastion, use an SSH tunnel.
Authentication failed
Authentication failed
Verify the username and password, the target database, and the auth method. On Amazon RDS you can use IAM authentication instead of a static password. For Redis 6+, remember the username can be blank with ACLs.
SSL / TLS errors
SSL / TLS errors
Match the SSL mode to your server. Managed and cloud databases usually need
verify-full with a CA certificate. See Secure connections.