Just a follow-up as the issue appears not to be related to App World but the BlackBerry Browser itself:-
The title of the article has been changed:-
Title: Access to web sites is bypassing the proxy setting configured for MDS Connection Service on the BlackBerry Enterprise Server
Issue Number: DT1200000
Link:
KB26655-Access to web sites is bypassing the proxy setting configured for MDS Connection Service on the BlackBerry Enterprise Server
There is another article that document the similar error and this is really affecting the App World:-
Title: Unable to log in to BlackBerry App World for BlackBerry smartphones when the BlackBerry MDS Connection Service is pointing to a proxy server
Issue Numbers: SDR120234, SDR128091, DT 914899
Link:
KB24693-Unable to log in to BlackBerry App World for BlackBerry smartphones when the BlackBerry MDS Connection Service is pointing to a proxy server