SAP Knowledge Base Article - Public

2782446 - Authentication Failure to access a Communication Arrangement Service URL


Using the communication user to access the Service URL (CDS endpoint) setup in communication arrangement, you may get alternately, 403 (Forbidden) or a 401 (not authorized) response.

For example:

URL: https://my***<TESTNAME>_CDS


  • S/4HANA Cloud

Reproducing the Issue

  1. Create a Communication Scenario and Communication Arrangement.
  2. Access the Service URL with the communication user and password.
  3. You may get '401 Not Authorized' or '403 Forbidden' error.


The communication user was locked or the password need to be reset.


  1. Go to Maintain Communication Users application.
  2. Unlock the user.
  3. If above is not working, please reset the password and save.

Note: There are user cases proved that sometimes a password including a slash character "\" may cause the user account being locked.

          Try to avoid using "\" in the password.


KBA , BC-SRV-APS-COM , Maintain Communication System and Arrangement , Problem


SAP S/4HANA Cloud 1902