When creating a ssh tunnel with the local port differs from 3306 (for example 3307, or any other port) SQL Squirrel cannot connect and reports a timeout in the stack trace. When 3306 is used, it works fine. In the meanwhile any other tool connects successfully.
The port is specified like localhost:3307 in the URL.
The operative system is Ubuntu 12.04 LTS, Squirrel version is 3.5.0 final.