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To fix the issue, adjust the value of the UploadReadAheadSize in IIS settings. Do the steps below:

  1. Open Internet Information Services (IIS) Manager.
  2. Expand the Server field.
  3. Expand Sites.
  4. Select Default Web Site.
     
    By default, Apex Central / Control Manager is installed on Default Web Site.
     
  5. In the Features section, double-click Configuration Editor, located under Management.
  6. Under "Section", select system.webServer > serverRuntime.

  7. Adjust the uploadReadAheadSize to "52428800".
     
    The uploadReadAheadSize is in bytes.
     
  8. Re-deploy the policy to verify if the issue still happens.

Further information about the "Request Entity too large" message can be found in the following Microsoft KB article:
Large file upload failure for Web application calling WCF service - 413 Request entity too large

If the issue still happens after completing the steps above, do the following:

  1. Collect CDT Logs by following this KB article.
    • Apex Central Server CDT
  2. Submit support ticket to Technical Support.