I have two Sharepoint applications: a user portal and a MySites applications. Both are configured for local publishing through an internal FQDN and externally via SSL through Forefront TMG. I have configured the alternate access mappings for the external FQDN using the "Internet".
When I access the portal application locally and then select the MySites links, both applications work as expected, but when I access the site externally, the MySites application breaks because it is trying to connect to the internal FQDN.