[HTTPCLIENT-1882] NTLM authentication error: Unexpected state: MSG_TYPE3_GENERATED

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.5.1
• Fix Version/s: 4.5.6, 5.0 Beta2
• Component/s: HttpClient (async), HttpClient (classic), HttpClient (Windows)
• Labels: stuck volunteers-wanted
• Assignee: Unassigned
• Reporter: Matthias Schmalz
• Created: 22/Nov/17 13:09
• Updated: 15/Aug/18 17:55
• Resolved: 04/Jul/18 15:44

Description

We use the httpClient as part of our products to send http requests. One of our customers makes use of NTLM authentication. In most cases (as in commonCase.log), authentication works well.

In rare cases (as in rareCase.log), the HttpAuthenticator logs

ERROR org.apache.http.impl.auth.HttpAuthenticator: NTLM authentication error: Unexpected state: MSG_TYPE3_GENERATED

Note that in rareCase.log the http client does not log anything between 10:08:48.990 and 10:10:23.577. We have analysed numerous cases where the authentication was and was not successful. We have observed that this period of inactivity occurs if and only if the NTLM authentication error is logged.

Is this a bug?
If not, could you please provide further information on why this is logged and how this can be avoided?