Does anybody know why Yahoo! OpenID login with DotNetOpenAuth stopped working?

Question

Yesterday I realised that Yahoo! OpenID login with DotNetOpenAuth wasn't working anymore on my site. Then I came to StackOverflow and tried to log-in here. Same problem.

Is this a temporary Yahoo! problem or is it a DotNetOpenAuth problem?

I tried using version 3.4.2 as well as the latest verstion, 3.4.6. I don't know what version does StackOverflow use.

EDIT

The details of what happens is the following (in both my site and StackOverflow)

1. I start a request do Yahoo OpenID IdP
2. Yahoo asks me to login
3. I log in successfully
4. The browser requests the following page and then gets stuck there:

https://open.login.yahoo.com/openid/op/start?z=Fi9ONwS5_ujGQwM.JCJN1IyY.5w.vlV7Ggr1yu..tHIkgZPpcVu68UMDlEWer5J9.mAVLddDMuOY8S5RZY31D3id.h7GMHHrgUT6RzniHCpAIj09Xrv5yAH2ltYe4Ubr9lvUu2MksoFCdBKfq7XjKALCT4Ln_ziCs9tQRAkHUDk4NdJqypZ.h16i8pnoUZIYXeX3XMLum4Xtk2ZdVr4CLNrIZWHN.Qxz3_GdG.P4hv1_ynq936zVeARvJZRB3EWhlXtX79eFF3d.JmUG.2zPAHa8L9UAbV6fug8r7qzYSLhhV2rNvhozoa5JuyZv5RY6jDFTeuG2NRv6KVNNi5iIrPA.j_KbjssQfGptofYct759pYkzEG_Adm0Jyo_RAER_MtXEXvWdlpffaL7q5ZEpglWTzw_Om7hYOB40WZuYVqXsMYtkSxGtOmk-&.scrumb=DcjHdwTmC5j

After the browser requests this page it does not return to my site neither to Stackoverflow. Either my site and Stackoverflow log successfully to Google.

Answer 1

I just logged into SO with Yahoo then - worked fine.

Answer 2

@Ciwee, You can try Yahoo! login out yourself with a DotNetOpenAuth RP here at this interop testing page.

I suspect what may have happened is perhaps your site has an XRDS page (very likely since you're testing with Yahoo!) and perhaps that XRDS page is missing an entry for your login page. Or perhaps even more likely, that XRDS file has your login page URL written using a particular capitalization and the one in your browser as you're logging in uses a different capitalization. If so, you can test that that is the problem by typing in the login URL yourself in the browser exactly as it appears in your site's XRDS file and see if it works that time.