Over the weekend an issue with the .CO domain extension caused problems for Twitter’s URL shorteners t.co and vine.co.
According to a report by The Next Web, Twitter shortens all links on its service using the t.co URL. On Saturday, it was caused by a problem with the .co domain that affected a “select number of people”, the report said.
“If you’re affected by the problem, all other .co domain names also won’t load,” TheNextWeb said. “It’s not entirely clear where the issue lies, but it appears to be related to a problem with the .co DNS servers and not related to Twitter itself.”
Twitter Support (@Support) sent out a tweet around 2:30 pm on Saturday to let users know that its engineers were investigating the issue. Twitter sent out a follow-up tweet that said the issue was resolved later that day.
On Monday, however, some users were still reporting problems getting t.co or vine.co to load. A Twitter user in London reported issues with only being able to load t.co links sporadically, while a user based in Turkey was reporting similar issues.
It is unclear what the issue is exactly, and Twitter hasn’t posted any details on its support site on the issue.
Twitter’s link shortener allows users to measure information about how many times a link has been clicked and also provides protection against malicious sites since it checks its shortened links against “dangerous sites”, according to a FAQ on its support page.