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Power Automate - Connector Development
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Custom Connector using on-premises data gateway throws error 500 - bad gateway

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I created a custom connector using https and the on-premises data-gateway.

 

When testing the connector, the test fails with the following error:

... System.Net.WebException: The remote server returned an error: (502) Bad Gateway. ...

 

When analyzing the log-files of the on-prem data gateway I can see, that the protocol for the request was changed from https to http:

 

"[ {""ConnectorType"": ""HTTP"", ""FullPath"": ""http://esap001e21.xxxxx:44301/sap/opu/odata/SAP/Z_IM_RAUMVERRECHNUNG_SRV/ZCO_ODATA_ENTITY_GET_DATASet(Controllingarea='',Costcenter='',Orderid='69441036')""} ]",Fail,35660.50,36213,35108,DirectQuery,,,,2

 

Any ideas, what causes the on-prem data gateway to change the protocol?

Thanks a lot.

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