# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2011-05-12 12:04:18 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/68647684801708032) A customer is trying to track down why a sign-in page works in Mobile Safari, but not in an In-App browser. #iOSDev