RDS behind Azure Web App Proxy works through browser but not when RDP file downloaded

Amandala_admin 0

Followed this Microsoft guide to protect the RDwebclient we setup on windows 2022 with azure application proxy: https://zcusa.951200.xyz/en-us/entra/identity/app-proxy/application-proxy-integrate-with-remote-desktop-services

This is working perfectly when using the RDwebclient and starting the connection in the browser. But when downloading the RDP file we get an error upon connecting: "Your computer can't connect to the remote computer because authentication to the firewall failed due to missing credentials"

Drawback: Not able to use Multiple Monitors

BANDELA Siri Chandana 1,085 Reputation points Microsoft Vendor

2024-11-22T17:41:51.9733333+00:00

Hi @Amandala_admin

Thank you for posting your query on Microsoft Q&A.

I understand that RDwebclient is working in the browser. But when you are downloading the RDP file you are facing error upon connecting.

Check whether you are running the command correctly without any errors:

Set-RDSessionCollectionConfiguration -CollectionName "<yourcollectionname>" -CustomRdpProperty "pre-authentication server address:s:<proxyfrontendurl>`nrequire pre-authentication:i:1".

For reference: https://zcusa.951200.xyz/en-us/entra/identity/app-proxy/application-proxy-integrate-with-remote-desktop-services#publish-the-rd-host-endpoint

Then you can download and connect your RDP file successfully.

Hope this helps. Do let us know if you have any further queries.

Thanks,

B. Siri Chandana.
BANDELA Siri Chandana 1,085 Reputation points Microsoft Vendor

2024-11-25T11:11:20.2866667+00:00

Hi @Amandala_admin
Just checking in to see if above information was helpful. If you have any further updates on this issue, please feel free to post back.
Amandala_admin 0 Reputation points

2024-11-26T02:30:29.3366667+00:00

Hi Siri Chandana,

Thank you for the prompt reply. Now i get the following error message.
Amandala_admin 0 Reputation points

2024-11-26T02:56:42.8233333+00:00

Hi @BANDELA Siri Chandana still no luck. I get the following message now. Also noticed a lot more clients are in similar boat like me. Any more suggestions please ?
BANDELA Siri Chandana 1,085 Reputation points Microsoft Vendor

2024-11-28T13:50:30.1533333+00:00

Hi @Amandala_admin
Just checking in to see if above information was helpful. If you have any further updates on this issue, please feel free to post back.
BANDELA Siri Chandana 1,085 Reputation points Microsoft Vendor

2024-11-29T08:53:43.5866667+00:00

Hi @Amandala_admin
Just checking in to see if above information was helpful. If you have any further updates on this issue, please feel free to post back.

2 answers

BANDELA Siri Chandana 1,085 Reputation points Microsoft Vendor

2024-11-27T16:13:04.37+00:00

Hi @Amandala_admin

Thank you for posting your query on Microsoft Q&A.

I understand that you are issue is not solved.

Please ensure that the settings populated within the RDP file are correct and when trying with HTML5.

Verify whether you Allow access to these URLs?

Can you ensure that TLS 1.2 is enabled?

Do you have the RDS ActiveX add-on installed and enabled if using Internet Explorer or Edge IE Mode

When you published you published your RD host endpoint can you make sure these settings are correct within your configuration(s)?

For more information. Follow below link:

https://zcusa.951200.xyz/en-us/answers/questions/1312681/your-computer-cant-connect-to-the-remote-computer

Hope this helps. Do let us know if you have any further queries.

If this answers your query, do click `Accept Answer` and `Yes`.

Thanks,

B. Siri Chandana.
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Amandala_admin 0 Reputation points

2025-01-06T04:08:49.1533333+00:00

@BANDELA Siri Chandana , Found the following Q & A

https://zcusa.951200.xyz/en-us/entra/identity/app-proxy/application-proxy-faq

Amandala_admin 0 Reputation points

2025-01-06T22:45:23.7933333+00:00

Hi @BANDELA Siri Chandana no luck with above instructions yet.

TLS 1.2 Is enabled.

What you provide the URL list, the above link takes me back to the proxy setup link. that is no mention of the url's.

RDS ActiveX add-on is not installed..

Access is working perfectly when using the RDwebclient and starting the connection in the browser. But when downloading the RDP file we get an error upon connecting: "Your computer can't connect to the remote computer because authentication to the firewall failed due to missing credentials"

Almost read every post online about this topic and tried everything mentioned, yet no luck.

@BANDELA Siri Chandana would you think Downloaded RDP file is not an option now ?
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Martin 0 Reputation points

2024-11-28T13:28:49.5933333+00:00

We have been searching for a way to get this working for some time to. As we need to redirect smartcards.

I think it's because the RD file, doesn't go via the app proxy, so that's why. But i'm hoping theres a fix soon, or smartcard redirection appears in the HTML5 browser one day.

Changing it from Entra to passthrough might work, but then you loose MFA which is rather important.
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Amandala_admin 0 Reputation points

2025-01-06T03:25:36.83+00:00

Hi @BANDELA Siri Chandana no luck with above instructions yet.

TLS 1.2 Is enabled.

What you provide the URL list, the above link takes me back to the proxy setup link. that is no mention of the url's.

RDS ActiveX add-on is not installed..

Access is working perfectly when using the RDwebclient and starting the connection in the browser. But when downloading the RDP file we get an error upon connecting: "Your computer can't connect to the remote computer because authentication to the firewall failed due to missing credentials"

Almost read every post online about this topic and tried everything mentioned, yet no luck.

@BANDELA Siri Chandana would you think Downloaded RDP file is not an option now ?

BANDELA Siri Chandana 1,085 Reputation points Microsoft Vendor

2025-01-07T10:21:10.27+00:00

Hi @Amandala_admin
I agree that this issue looks strange, and I wasn't able to reproduce this issue. If you have a support plan, could you please file a support ticket for deeper investigation and do share the SR# with us? In case if you don't have a support plan, please let us know here.

Thanks,

B. Siri Chandana.

Amandala_admin 0 Reputation points

2025-01-09T02:44:53.9066667+00:00

Hi @BANDELA Siri Chandana , Dont have a support plan. Not sure how else to resolve this issue, happy to sign up for support too, if it offers more better remote assistance

BANDELA Siri Chandana 1,085 Reputation points Microsoft Vendor

2025-01-09T05:45:28.29+00:00

Hi @Amandala_admin
Follow the link to create Azure Support Ticket: Azure support. https://zcusa.951200.xyz/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request

if you are not able to login to your Azure Subscription to create an Azure support request the best option might be to call Microsoft's Global Support: Global Customer Service phone numbers

Thanks,

B. Siri Chandana.
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RDS behind Azure Web App Proxy works through browser but not when RDP file downloaded

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