Twitter gained a tighter security skin yesterday as it enabled a permanent HTTPS state, followed by an hour's downtime and a spike in error rates.
The new protocol allows users to tweet by default over Secure Sockets Layer (SSL), which encrypts data. Without SSL, user information and accounts are vulnerable to hijacking, especially when used over unsecured Wi-Fi networks.
The default service is still unavailable to mobile devices other than Apple's iPhone. Those users will need to visit https://mobile.twitter.com to access the SSL service.
Twitter acknowledged the outages on its website, but did not say if the new HTTPS feature was at fault.
"Some people may experience problems performing actions on twitter.com and Twitter clients. We are aware of the problem and are taking action."
Twitter has said that the undisclosed issue has now been resolved.
The new security move follows the decision by social networking giant Facebook to enable HTTPS for users, but the function is not yet on offer by default.