Here's a list of FTP applications that have been known to work with (mt) Media Temple servers. Click on the first link for a walkthrough specific to (mt) Media Temple. Once you've opened the article to your FTP client of choice, be sure to check the label at the top of the article to ensure you follow the instructions for your server type:
STATEMENT OF SUPPORT:
Please keep in mind that troubleshooting the configuration/functionality of third-party applications is not covered by our statement of support. These resources were provided as a courtesy to assist you to the extent of our abilities. For more information on our statement of support, feel free to click here.
Dreamweaver (Mac, Windows)
FileZilla* (Mac, Windows, Linux)