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RDWeb with MFA: Unable to Open Application on Non-IE Browsers

Recently we land up to the issue where were unable to open the RDWeb applications with the non-IE browsers which were downloading .rdp file. Let me share the small fix here as this is nowhere documented in the Microsoft internal and external or any blog.


We were getting the following popup which opening any application from RDWeb page.

Your computer can’t connect to the remote computer because authentication to the firewall failed due to missing firewall credentials. To resolve the issue, go to the firewall website that your network administrator recommends, and then try the connection again, or contact your network administrator for assistance.


I got the same popup in IE but I added RDWeb URL in the trusted sites and it went away.

For non-IE browsers from the internet, we were getting this error which means my non-Microsoft OS users can’t use RDWeb.

We opened a Microsoft case to fix this but Microsoft was clueless and reviewed multiple logs, involved WAP team, and other escalation teams.

At the same time, Microsoft referred me to the TechNet link.

After reviewing the link, I figured out that I had run the following command

Set-RDSessionCollectionConfiguration -CollectionName “MyAppCollection” -CustomRdpProperty “pre-authentication server address:s:’nrequire pre-authentication:i:1″`

But I should have run this command.

Set-RDSessionCollectionConfiguration -CollectionName “MyAppCollection” -CustomRdpProperty “pre-authentication server address:s: require pre-authentication:i:1″`

After running the correct command. RDWeb app started working from all browsers from the internet. I should rather say, .rdp file started connecting to the apps and the error mentioned above went away.


Prabhat Nigam

Microsoft MVP | CTO @ Golden Five


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