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On ICS or later you can check this in your settings. Go to Settings->Security->Trusted Credentials to see a list of all your trusted CAs, separated by whether they were included with the system or installed by the user. Earlier versions of Android keep their certs under /system/etc/security in an encrypted bundle named cacerts.bks which you can ...

If you control the network, you can use Shark for Root to check whether the apps open port 80 (default port for HTTP) or port 443 (default port for HTTPS). IIRC, WireShark can also read HTTP headers. If you don't want to root your phone, and you're on a Wifi network that you owned; you can use Wireshark/Firesheep to snoop on the traffic of the Android ...

I found the following but I don't think this is a definitive answer though it looks close to what I need, secure end-to-end encryption with no chance of snooping/sniffing/MITM. http://en.wikipedia.org/wiki/Off-the-Record_Messaging#Phone_apps I wasn't fully aware of OTR though I had heard the term used elsewhere but didn't know the full implications. I ...

If Joe's device is rooted and Joe has a server (with full SSH access) running somewhere on internet, Joe should use SSH Tunnel app with socks proxy option checked (for dynamic port forwarding). There's no need to install VPN server or proxy server. There's no need to do complicated configurations on server. Plus, Joe's data will be secured inside powerful ...

I don't think there is a way to find out directly. The only thing I can think of is Check the log files and hope there is a mention of https, however this is not likely to be very succesful. Reverse engineer the app and look at the source code but to understand what your looking for you'll want to have some Android programming experience.

We had similar issues in our office router which had expired security certificate resulting in denial of HTTPS URLs. When we updated our certificate this issue was solved. I guess your issue should be similar. I stumbled on a web page that claims the solution. But looking at the solution I very much doubt its worth.

I don't think there is any widely known issue with this. I am able to sign in to StackExchange automatically on my Nexus S. I looked around at the Android Issue Tracker and while there are a lot of results for "browser https", none in the first 20 or so seemed pertinent. It might just be a problem local to your phone. I'd try resetting it.