I have added the OpenID delegation code for VeriSign PIP to my website, and it is accepted on all websites except the Stack Overflow series. All attempts to add http://nullroute.eu.org/~grawity/ (my website's address) as an OpenID to Server Fault, Super User, or the rest result in:

Unable to log in with your OpenID provider:

No OpenID endpoint found.

It seems that Stack Overflow is looking for the <link> tags inside <html><head>. This fails, because my index.html does not have a <html> tag. (Optional in all HTML versions.) This has been already noticed by other users, and confirmed by me: I temporarily added <html> and stackoverflow.com happily accepted my new OpenID.


SE sites authenticate using DotNetOpenAuth, the bug-tracker for which can be found here.

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