...
Authentication-Denied-Reason →CAPTCHA_CHALLENGE; loginurl=http://abc.com/login.jspX-Content-Type-Options →nosniffX-Frame-Options →SAMEORIGINX-Seraph-LoginReason →AUTHENTICATION_DENIEDX-XSS-Protection →1; mode=block
Root Cause:
The authentication request from your application is denied by your Jira instance due to 3 incorrect login attempts using the user ID enabling captcha challenge.
Solution:
Login into your Jira instance using the same credentials and complete the Captcha challenge to login and then retry importing the results using the API.