Repost from Apple Developer Forums:
iTunes Connect unavailable December 23-December 28
Dec 11, 2009 11:26 AM
iTunes Connect, the tool you use to manage your applications and access your reports, will be unavailable December 23 through December 28, 2009. Access to iTunes Connect will resume on Tuesday, December 29, 2009.
Additionally, the In App Purchase sandbox environment will also be unavailable at this time.
Please plan accordingly.