Microsoft has posted a service alert to notify users of an issue it is having with processing sign-ins for Xbox Live .

Update (11:15pm ET): The issue has now been resolved. We wish you happy gaming.

The company says the following platforms are affected: Games for Windows LIVE, Windows 8, Windows Phone, Xbox 360 Console, Xbox.com, Zune PC Client.

The alert also includes the following note:

“It looks like you’ve been disconnected from Xbox LIVE and worse, you can’t sign back in! We will get this fixed as quickly as possible. Thanks for being patient while we sort this out. Please check back in half an hour for more information.”

Gamers have taken to Twitter en masse to report the downtime and Microsoft’s Xbox Support accounts are in full gear. When I pinged one of the accounts, it responded that some users have been able to get back in, while noting that the issue isn’t yet fully resolved.

Microsoft says other services, including Xbox Music and Video and third-party apps based on Xbox live, are all up and running, but that presumably won’t do much good for any users that are unable to sign in.

Xbox Live was originally the dedicated online platform for Microsoft’s gaming console, and the company has expanded it to its Windows and Windows Phone operating systems as well. The move provides continuity and capitalizes on goodwill for the Xbox brand, but it also makes outages like tonight’s more severe.

See also: Call of Duty, Minecraft, CastleMiner and Grand Theft Auto score most users on Xbox Live in 2012

Image via Flickr / jamiemc