ContributionsMost RecentMost LikesSolutionsAccess is denied due to invalid credentialsHi, I have been using testcomplete to automate the APIs in my application. The authentication method used in the application is windows authentication . The GET APIs have been automated successfully but once i started automating POST and PUT calls, i am getting unauthorized access errors. Everytime the XmlHttpRequest.send is executed, the following reponse I get <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/> <title>401 - Unauthorized: Access is denied due to invalid credentials.</title> <style type="text/css"> <!-- body{margin:0;font-size:.7em;font-family:Verdana, Arial, Helvetica, sans-serif;background:#EEEEEE;} fieldset{padding:0 15px 10px 15px;} h1{font-size:2.4em;margin:0;color:#FFF;} h2{font-size:1.7em;margin:0;color:#CC0000;} h3{font-size:1.2em;margin:10px 0 0 0;color:#000000;} #header{width:96%;margin:0 0 0 0;padding:6px 2% 6px 2%;font-family:"trebuchet MS", Verdana, sans-serif;color:#FFF; background-color:#555555;} #content{margin:0 0 0 2%;position:relative;} .content-container{background:#FFF;width:96%;margin-top:8px;padding:10px;position:relative;} --> </style> </head> <body> <div id="header"><h1>Server Error</h1></div> <div id="content"> <div class="content-container"><fieldset> <h2>401 - Unauthorized: Access is denied due to invalid credentials.</h2> <h3>You do not have permission to view this directory or page using the credentials that you supplied.</h3> </fieldset></div> </div> </body> </html> I am quite a newbie in API automation so can anybody help me to figure out the problem in the PUT method that i have attached. Here is the method var URL,data; var ResponseStatusCode=null; function Add_RemoveFlags() { URL = "http://10.0.0.0.1002/api/Accounts/16611/EnrolledPrograms/UpdateEnrolledProgram" data = '{"IsActive":true, "EnrollmentProgramId": "16"}'; PUT_Call(URL,data); } function PUT_Call(requestURL, requestBody) { var response; var XmlHttpRequest = Sys["OleObject"]("MSXML2.ServerXMLHTTP.3.0"); XmlHttpRequest.open("PUT", requestURL, false); XmlHttpRequest.setRequestHeader("Content-Type", "application/JSON"); XmlHttpRequest.setRequestHeader("X-FPSSO", Project.Variables.Token) try { XmlHttpRequest.send(requestBody); response = XmlHttpRequest.responseText; } catch (e) { //Log.Error("Error"); } return response; } Any help will be useful. P.S. I have tried using ntlm authentication already but same problem persists Thanks, Saira.