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The SourceForge signon page says I can associate an OpenID with my existing SourceForge account:

  1. I enter my currently-signed-in SourceForge account password
  2. I select the custom OpenID URL and enter
  3. I'm redirected to<session key bits>
  4. I enter my login information there
  5. I get the error message:

    Cannot Complete Login

    Detected an attempt to send an assertion when the identifier ( is not owned by the logged in user.

I don't understand what that means.

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I just reproduced this by trying to comment on this blog post, re-tagged as a (possible) bug. – Tim Post Dec 6 '12 at 3:35
Slightly different problem here - not even getting the redirect. SF error, There was an error using your OpenID. – dbreaux Sep 4 '13 at 18:32

I just tried to do this as well. It appears it's not possible to use Stack Exchange's OpenID in SourceForge without using delegation.

If you want to try delegation though, go to your open.stackexhange user page, click "Use your own URL to log in", and serve that HTML snippet somewhere on your own personal site. (I think that's how it works.)

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