Could a firewall be causing DBeaver's SSL connection reset errors?

Yes, a firewall on your client machine, the server, or anywhere in between could be blocking the SSL connection. Ensure that the firewall allows outbound connections to the server's port (typically 3306 for MySQL, 5432 for PostgreSQL, etc.) using the SSL protocol (usually TCP port 443 or the standard database port with SSL enabled). Temporarily disabling the firewall (for testing purposes only!) can help determine if it's the source of the problem.