Hi!
RequestedDeletion, PHPMyadmin requires a ssl connection and that is on port 443.
Charles, what happens, if you just drop the :443, since it is the default port for https:// ?
What browser (version) are you using? I just tested the latest version from Night Spirit with Firefox (take care of some of the Firefox extensions, which might cause problems) and it worked like a charm on my SME 6.01-01.