It looks like Xbox Live is down currently, and has been having issues all day. Several other services across Microsoft’s cloud are experiencing outages as well, including Games for Windows Live, Windows 8, Windows Phone, Xbox 360 Console and the Xbox website.
The most recent update at the time of this post confirms that Live is down:
Users may experience difficulties with the following services:
Posting or viewing entries in the LIVE forums
Affecting the following LIVE Platforms:
7/23/2013 2:15:04 PM PDT:
If you are unable to use the search function in the forums, please know that we’re hard at work on this issue. We appreciate your patience! As always, we’ll keep you updated right here every half-hour.