I'd like to allow users on my site to authenticate via StackExchange account. This page says SE OpenID endpoint should be https://openid.stackexchange.com, but I can't log in to any site using this endpoint. On the same sites, the Google OpenID endpoint works fine.

Are there any problems or limitations with SE OpenID provider?

  • when you say "any site" which sites are you referring to, specifically? We've tested it with a number of large, popular sites that support OpenID and it works. Jul 31, 2011 at 23:14
  • I've tried it from openid-consumer.appspot.com. It fails. Jul 31, 2011 at 23:26
  • clearbits.net fails too. Jul 31, 2011 at 23:35
  • I can confirm that openid-consumer.appspot.com fails. It says 'Login Cancelled'.
    – Soumya
    Aug 1, 2011 at 0:54
  • @Andrei Can't reproduce a problem on Clearbits.net, just signed up for a new account using SE OpenID.
    – user50049
    Aug 1, 2011 at 1:35

1 Answer 1


Clearbits.net seems to fail for purely internal reasons. If you create a new account with an OpenID everything seems fine; the whole exchange works properly from our end so far as I can tell.

After a brief exchange with Andrew Arnott (author of dotNetOpenAuth), it was found that openid-consumer.appspot.com is non-compliant with the OpenID spec; claiming to sign fields it does not actually send. It is impossible to securely complete authentication, so we send them an error (the cause of the "Login cancelled" message).

We only really care to support well written OpenID relying parties, such as...

  • Ourselves (more generally, anybody using dotNetOpenAuth semi-competently)
  • Disqus
  • Typepad

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .