Why am I getting a 401 or API-1029 error when using REST APIs?

Document ID : KB000012828
Last Modified Date : 14/02/2018
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Question:

Why am I getting a "401 unauthorized" or "API-1029 : Authentication Error" when trying to use the REST APIs?

Answer:

The user does not have the necessary rights.

In an environment that the REST API Access has not been disabled (in the CSA, Server properties > Application > Application Server > Disable REST API Access (unchecked)), please add the Global Access Right API - Access to the user trying to use the REST API.