Skype engineering team has confirmed that it’s a software issue on the part of Skype, according to a message posted on Skype homepage. According to Skype Heartbeat, the software problem affects sign in and registration module and peer-to-peer network core, where there are problems with Skype login. Skype expects problems to be resolved within 12 to 24 hours.
Skype sign-in problem has reportedly felt by users in Malaysia, Colombia, Brazil, Germany, Finland, Singapore and the United States, and probably more. It may also be the longest outage of a single popular online service in history.
Skype asked users to simply leave your Skype client running and as soon as the issue is resolved, you will be logged in.