I don't claim (yet) this be a bug but... Debugging shows that the exception is thrown at https://svn.apache.org/viewvc/httpcomponents/httpclient/tags/4.5.3/httpclient/src/main/java/org/apache/http/impl/auth/NTLMEngineImpl.java?view=markup#l217
I see that the class has been fairly stable over time - possibly because who the hell still uses NTLM (I'm forced to). I don't understand the code but have the feeling that the server sends data in a format/structure unexpected by the HTTP client. Btw, the reason why I'm trying to use Apache HTTP client rather than the JVM's Authenticator.setDefault() is https://stackoverflow.com/q/47197941/131929: that approach doesn't work with WebLogic Server. -- Marcel Stör, https://frightanic.com My PGP key: https://frightanic.com/pgp/ Couchsurfing: http://www.couchsurfing.com/people/marcelstoer O< ascii ribbon campaign - stop html mail - http://j.mp/1OThh9L
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