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https://issues.apache.org/jira/browse/HTTPCLIENT-1545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14168571#comment-14168571
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Ka-Lok Fung commented on HTTPCLIENT-1545:
-----------------------------------------
There was a case in the original code where it was possible to get an infinite
loop if {{InitializeSecurityContext}} returned an error (doesn't matter what
error, I just chose {{SEC_E_DOWNGRADE_DETECTED}} because it happened in my
environment). I fixed it and added this test case to make sure a regression for
this error doesn't happen again.
I agree that the SPN should be {{HTTP/example.com}}. However, before 1619373,
it was using the provided service principle name (which in the default case
through {{WinHttpClients}} would have been {{null}}) OR the username.
While the MSDN documentation doesn't say that {{SEC_E_DOWNGRADE_DETECTED}} can
be returned, it certainly happens in our testing. Our server based
authentication provider only supports Kerberos and not NTLM; perhaps this is
the cause for this error message. When this unit test was run by Oleg on his
Windows machine, it didn't happen the {{SEC_E_DOWNGRADE_DETECTED}} didn't
happen for him either.
Hope this clarifies things.
-kl
> Possible infinite loop when WindowsNegotiateScheme authentication fails
> -----------------------------------------------------------------------
>
> Key: HTTPCLIENT-1545
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1545
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient
> Affects Versions: 4.4 Alpha1
> Environment: Windows
> Reporter: Ka-Lok Fung
> Fix For: 4.4 Beta1
>
> Attachments: HTTPCLIENT-1545.WinXP.diff, HTTPCLIENT-1545.patch.diff,
> HTTPCLIENT-1545.v2.patch.diff
>
>
> When {{WindowsNegotiateScheme}} authentication fails, it's possible for
> HttpClient to retry the authentication in an endless loop because the
> {{continueNeeded}} flag is not set to {{false}} when authentication fails.
> One possible way of causing authentication to fail is to use a service
> principle name that is outside your Windows domain (e.g., HTTP/EXAMPLE.COM).
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