I just enabled Federated engine on MySQL 5.5 server. I set up a federated table on another server and made sure I had an IP passthrough setup on the server I'm connecting to on MySQL port. The connection is really slow. In MySQL workbench, initially selecting the table or especially right clicking on the table causes MySQL workbench to lock up and I have to force it to close. If it does finally let me click on it, I get an error when trying to query data:
Error Code: 1429. Unable to connect to foreign data source: Can't connect to MySQL server on 'server IP' (110)
I have another MySQL server where I set up the same Federated table to the same destination server and I have no problems querying data.