firefox sync is not working behind enterprise proxy

I've installed Firefox 4.0 and created a new sync account but while trying to sync my data with Firefox Sync server I always get an error saying that it's impossible to connect to server.

All HTTPS web sites are working well.

I've tryed to use UltraSurf proxy instead of enterprise proxy and sync is working, so I guess that the problem is the enterprise proxy authentication of Firefox sync application. Any suggestion to solve the problem???

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