Application Proxy - page can't be found

Frequent Contributor

I created an Application Proxy and it works as expected. I go to https://myapp.msappproxy.net/ and it takes me to my app on the internal webserver.

 

However, I want to use a custom domain to get to the app. I changed the external url to https://myapp.mycompany.com and uploaded the certificate.

 

The next step says to change the CNAME record to have https://myapp.mycompany.com point to https://myapp.msappproxy.net/ . However, as soon as I change the external url https://myapp.msappproxy.net/ no longer works. I get the message:

 

"This myapp.msappproxy.net page can’t be found

No webpage was found for the web address: https://myapp.msappproxy.net/"

 

Is this expected behaviour? I don't dare change the CNAME to point to somewhere I can't get to anymore.

 

Am I missing something?

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