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Error while calling on-prem api from custom connector

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Posted on by roshanma

I have created a custom connector to call on-prem API, this API is my test instance of the ERP system which uses HTTPS as scheme.

I have installed the on-prem data gateway on my laptop and custom connector is configured as bellow,

I have created a connection with Username, Password and DataGateway.

When i test the connector it gives bellow error

"status": 500,
"message": "Received error payload from gateway service with ID 2016645: Substituted: HttpRequestException:<ccon>System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. ---> System.Security.Authentication.AuthenticationException: The remote certificate is invalid according to the validation procedure.

Can anyone help on this?

Thanks,

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Using connectors

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Michael E. Gernaey 53,454 Super User 2025 Season 2 on at

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Hi,

The problem seems pretty clear, your SSL cert is not valid for what you are trying to do.

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Thank You
Michael Gernaey MCT | MCSE | MCP | Self-Contractor| Ex-Microsoft
https://gernaeysoftware.com
LinkedIn: https://www.linkedin.com/in/michaelgernaey

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roshanma 43 on at

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Hi,

Could you please provide any web resources to resolve this issue?

Thanks

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Michael E. Gernaey 53,454 Super User 2025 Season 2 on at

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HI,

If you cert is invalid you need to install a Cert on your Gateway/Internal that would be valid. Apologies, I dont have a link its just standard SSL.

If I can ask, try browsing to your End Point that the Flow is calling. See if when you browse you get an SSL error. That would be where you would install a fresh one (or a valid one for this type of communications)

Cheers
If you like my answer, please Mark it as Resolved, and give it a thumbs up, so it can help others
Thank You
Michael Gernaey MCT | MCSE | MCP | Self-Contractor| Ex-Microsoft
https://gernaeysoftware.com
LinkedIn: https://www.linkedin.com/in/michaelgernaey

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roshanma 43 on at

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Hi ,
Thanks for replying, yes i can browse the end point using the browser.

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Michael E. Gernaey 53,454 Super User 2025 Season 2 on at

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@roshanma

The question was do you get an HTTPS SSL error?
From the Power Automate system, all the way to the System it is talking too, has to have a Valid SSL Cert. You can still browse, even if its not valid, but power automate won't do it as a valid one is required.

So something is broken in between the Power Automate Service and your endpoint internally

Cheers
If you like my answer, please Mark it as Resolved, and give it a thumbs up, so it can help others
Thank You
Michael Gernaey MCT | MCSE | MCP | Self-Contractor| Ex-Microsoft
https://gernaeysoftware.com
LinkedIn: https://www.linkedin.com/in/michaelgernaey

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roshanma 43 on at

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Sorry if I'm bothering you. I'm quite new to the power platform.

For testing purposes, I have created an asp.net web app (an API) and added the below record to applicationhost.config.
<binding protocol="http" bindingInformation="*:58938:<my local ip>" />
<binding protocol="https" bindingInformation="*:58938:<my local ip>" />

To enable access from the local network, now local network users are able to access the API with the http, but when they use the https, the error

<my local ip> sent an invalid response.

Try running Windows Network Diagnostics.
ERR_SSL_PROTOCOL_ERROR

also i have created a custom connector to this sample api , and it works with http as expected, but not with https.

yes i understand i need to install an SSL certificate on my local machine.
Is it needed to be installed at Truested Root Certifications or Personal? I have installed both stores but have had no luck.

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roshanma 43 on at

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Hi ,
It is the Gateway Service Account, by default Gateway Service Configured to user NT SERVICE\PBIEgwService,
then i changed the service account to my login account domain\myusername then i checked the connector and then it worked,
as a beginner can i know the reason for that and is it okay to use my account as a service account?

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roshanma 43 on at

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Hi ,
It is the Gateway Service Account, by default Gateway Service Configured to user NT SERVICE\PBIEgwService,
then i changed the service account to my login account domain\myusername then i checked the connector and then it worked,
as a beginner can i know the reason for that and is it okay to use my account as a service account?

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