I'm trying to login to stackoverflow using my wordpress openID. When I'm redirected back, I see the message
Redirects on POST requests that are to untrusted servers is not supported.
Is it by design or it's a bug?
Sadly, no progress right now beyond identifying that this is related to the domain redirect... somehow. I suspect it may have to be something broken on Wordpress's end.
I haven't been able to track down the source code for the exact version of dotNetOpenAuth we use, which stalled my debugging efforts. I'll try to set aside some time to give it another shot soon. I'll update this answer if/when there are any news to report.