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Helper I
Helper I

On premises API for web service Custom Connector - 404

I have a web service installed on a server where I can pull API data via


It is limited to on premises access and I'm able to use the API via Postman so long as I'm on the corporate wifi but not when off.


I'm trying to create a custom PowerApps connector which utilizes the API. I've installed the On-Premises data gateway onto my server but not sure what I need to configure. 


My connector settings are:


  1. General
    1. Connect via on-premises data gateway - Checked
    2. Scheme - HTTP
    3. Host -
    4. Base URL - /REST/
  2. Security
    1. Windows Authentication
  3. Definition - Configured for API
  4. Test
    1. Selected connection - Gateway connection
      1. Connection Settings:
        1. Authentication Type: Windows
        2. Username/Password: local admin account
        3. Choose a gateway: API Gateway





Status - (404)


"strict-transport-security": "max-age=31536000; includeSubDomains;,max-age=31536000; includeSubDomains",
"x-content-type-options": "nosniff,nosniff",
"date": "Thu, 05 Sep 2019 20:55:47 GMT",
"x-frame-options": "SAMEORIGIN,DENY",
"content-type": "application/json; charset=utf-8",
"x-ms-request-id": "82355ed7-9af3-4540-84ba-b095-c70d0431",
"cache-control": "private,no-store",
"content-length": "527"



"Status": 404,
"URL": "/rest/server/authenticationtokens",
"Method": "POST",
"Exception": {
"Name": "NotFoundException",
"Message": "Exception of type 'MFWS.NotFoundException' was thrown."
"Stack": "Error reference ID: ea3ac03b-72c5-40a3-9583-6cc867373058",
"Message": "Exception of type 'MFWS.NotFoundException' was thrown.\r\nclientRequestId: 82355ed7-9af3-4540-84ba-b095-c70d0431",
"IsLoggedToVault": false,
"IsLoggedToApplication": false,
"ExceptionName": "NotFoundException"

Community Support
Community Support

Hi @CamSims ,


Did you follow steps in below documentation correctly?




Community Support Team _ Mona Li
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

I have. With the exception of creating a web application in VS since I already have a platform running the api (M-Files). 


Do I need to create a separate application in VS?

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