A client is attempting to log in to a web application that requires authentication. The following HTTP headers are sent by the client:
GET /owa/ HTTP/1.1 Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ= User-Agent: curl/7.26.0 Host: 10.0.0.14 Accept: */* Accept-EncodinG.gzip,deflate
The web server is responding with the following HTTP headers:
HTTP/1.1 401 Unauthorized Content-TypE.text/html Server: Microsoft-IIS/7.5 WWW-AuthenticatE.NTLM DatE.Wed, 16 Aug 1977 19:12:31 GMT Content-LengtH.1293
The client has checked the login credentials and believes the correct details are being entered.
What is the reason the destination web server is sending an HTTP 401 response?