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I have been trying to set up an OpenID provider on my server which integrates with LDAP. I found Community-ID ( which seems to do exactly what I want with the exception that it does not work with the stackoverflow website. Whenever I try and log in to stackoverflow, I enter the identity URL, get taken to my servers login page, then redirected back to stackoverflow at which point I am presented with:

Unable to log in with your OpenID provider:
Unexpected HTTP status code 500 InternalServerError received in direct response.

The problem is easy to reproduce with the public community-id provider: The only other site I have tested it with is slashdot which works fine. I have filed a bug with the community-id team but based on some testing I did at ( I think the problem is that the community-id provider is not "sending properly formatted error responses to invalid direct request messages" (from test ( as the error message is the same. Logs have not been very helpful (apache error/access, community id logs, etc) and I obviously cannot see the stackoverflow server logs.

I am not sure who's bug this is, community-id's or stackoverflow's. Has anybody seen anything similar before? Any suggestions for an alternate OpenID provider which supports an LDAP backend?

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migrated from Jun 7 '10 at 14:46

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I just checked out Their site doesn't get much confidence from me. They fail at least one security test on and they take new user registration passwords in cleartext HTTP instead of HTTPS.

Their HTTP server also can't handle HTTP/1.1 POST requests that include a 417 Expect Continue header, which is what causes some RPs such as StackOverflow to fail while logging in a user. As it turns out, StackOverflow's OpenID library automatically "recovers" from this particular 417 failure by marking down to skip that header in the future. It only lasts for a little while though. What this means for you is that if you choose to continue using, and stackoverflow gives an error when logging in, try again immediately and it should work.

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