So I happen to be in UBD the other day and the typically open Guest@UBD wireless access point seemed to be proxied and requires authentication as shown below.
Normally it won’t ask for any authentication. Assuming that the access point is a legitimate one, a guest at UBD would not have any login credentials now would they? However I did notice that Twhirl did load some tweets (but gave the pop-up authentication dialog above) and that my Instant Messenger, Adium, was connected. So I tried a https connection to Gmail and it worked! Searched for an https proxy on my phone and found some here. Added a proxy to Firefox’s proxy setting (Preferences > Advanced > Network > Settings) and I’m back on the web.
In order to cover all network connections (e.g. via instant messenger, Adobe air applications) proxy settings will need to be changed in network settings.
Note: Online https proxies would be a temporary fix but that will only work in web browsers. They are best used to find the proper proxy settings and once the network settings are changed to use the proxy their job is done. Proxify (https://proxify.co.uk/) and Remainhidden (https://remainhidden.com/) are just 2 of many that you can find through Proxy.org (https://proxy.org/)