Error when trying to connect (Error occurred in the document service: Error while downloading the document file to be converted.) (version 7.2.1.34)

Workspace
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I changed following properties to false in DocumentServer\config\default.json and now it is working for me.

 "request-filtering-agent" : {                               
     "allowPrivateIPAddress": false, 
     "allowMetaIPAddress": false              
  },