Why do I receive license error 4401 when validating my MATLAB Parallel Server cluster?

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I am attempting to validate my MATLAB Parallel Server cluster from MATLAB. The validation fails and I receive license error 4401 (shown below). How can this be resolved?
Diagnostic Information:
Feature: MATLAB_Distrib_Comp_Engine
License path:
Licensing error: 4401,0.

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 22 Mar 2019
Edited: MathWorks Support Team on 22 Mar 2019
This error occurs when MathWorks fails to authenticate your license when using a LNU or Online Licensing with MATLAB Parallel Server license. Most often this authentication is caused be issues communicating from your local computer to MathWorks servers that perform the license validation. Please ensure that your network firewall is configured to allow communication over the following domains:
  • login.mathworks.com
  • services.mathworks.com
  • licensing.mathworks.com
Alternatively, if using a Online Licensing MATLAB Parallel Server license, this error may occur if you entered the wrong license or trial number in the 'LicenseNumber' field within your cloud Cluster Profile. Please see the steps below to change the profile:
  1. Open MATLAB and go to the 'Home' tab.
  2. Select the 'Parallel' dropdown menu, then select 'Manage Cluster Profiles'. This will open the Cluster Profile Manager.
  3. Select your MATLAB Job Scheduler Cluster Profile on the left.
  4. Look for the 'License number' field. Enter your MATLAB Parallel Server license or trial number into this field.
  5. Make sure this profile is set as the default profile. Select the 'Set as Default' button at the top of the Cluster Profile Manager window.
After this, try running your job or performing cluster validation again.
NOTE: Starting in R2019a the following name changes occurred: * MATLAB Distributed Computing Server was renamed to MATLAB Parallel Server * mdce_def was renamed to mjs_def * mdce binary was renamed to mjs

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