REST Invoke API returns HTTP 401 Unauthorized

Document ID : KB000125464
Last Modified Date : 29/01/2019
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When REST Invoke API call is tested in DevTest, sometimes get the "HTTP 401 Unauthorized" response.

Example API call is "http://host:port/api/Dcm/VSEs/VSE/"

The API call can be tested from Postman, DevTest, SoapUI..
Any DevTest environment.
Here are few causes could give the HTTP Unauthorized response:

. Incorrect header information.
. Incorrect Port number.
Providing the correct Authorization information/Port number should resolve the issue.