Why my website not working properly if I use custom domain?

Mahmudul Hasan 1

I have created an app service using the B1 tier and hosted a Blazor app for testing purposes.
After that, I've added a custom domain and configured an additional SignalR service, and pushed the app via Visual Studio.

Everything is fine, the app is up and running, I can navigate to the website using the domain.

But the problem is if I navigate to my website via the custom domain, the site doesn't work properly, the button doesn't work, SignalR seems slow, etc.

The following screenshots may help to understand properly -

Counter button and the hamburger button working if I navigate to the site using azure's free domain - https://saffron.azurewebsites.net/counter

Counter button and the hamburger button is not working if I navigate to the site using my custom domain - https://saffron.pienteger.com/counter

The problem happening on both desktop and mobile platforms. I took the screenshot using the mobile view to bring the hamburger button. Also, I've changed the browser, platform, cleared cache and cookies, but the result remained the same.

So what could be the reason and how can I solve this issue?

ajkuma 25,626 Reputation points Microsoft Employee

2021-05-20T11:49:41.953+00:00

@Mahmudul Hasan , Thanks for the detailed description of the issue.

From my initial check, it looks like Always On is not turned on. Enable Always On and then check.
I have seen few issues with B1 tier on blazor/ just to isolate - Switch the plan -B1 -> B2 -> B1 or just switch to B2 plan.

I understand you’re reviewing the app with minimal compute for testing purposes. Look like you’re using a small instance, you can avoid the outbound TCP limits is easier to solve, as the limits are set by the size of your worker. You can see the limits in Sandbox Cross VM Numerical Limits - TCP Connections- - To avoid outbound TCP limits, you can either increase the size of your workers, or scale out horizontally.
ajkuma 25,626 Reputation points Microsoft Employee

2021-05-20T11:59:17.53+00:00

@Mahmudul Hasan ,

Also, On the App Service App, in the left navigation, click on Diagnose and solve problems – Checkout the tile for “Diagnostic Tools” > “Availability and Performance” & "Best Practices" and review to fetch additional information to isolate further.

Kindy let us know how it goes, we will follow-up with you further.
Mahmudul Hasan 1 Reputation point

2021-05-20T12:01:49.78+00:00

I turned the Always On -> On but the problem remained the same. And if I turn the WebSocket On too, the problem occurs to the https://saffron.azurewebsites.net/counter URL too.
Mahmudul Hasan 1 Reputation point

2021-05-20T12:10:20.55+00:00

Can you be more detailed?
Mahmudul Hasan 1 Reputation point

2021-05-20T12:16:53.14+00:00

This is my current configuration.
ajkuma 25,626 Reputation points Microsoft Employee

2021-05-20T19:09:49.837+00:00

Thanks for the update and sharing additional details. Just want to check if switching to B2 tier showed any difference.
I'm investigating on this and will also reach out to you privately.
Mahmudul Hasan 1 Reputation point

2021-05-20T19:17:33.713+00:00

Hello, I switched to B2, faced the same problem, went back to B1, still facing the same problem. I restarted the app after every migration.

Here is my ss of my dashboard. I took it after I switched to B2.

Thanks.
ajkuma 25,626 Reputation points Microsoft Employee

2021-05-20T19:19:56.217+00:00

Apologies! if it was not clear. The App Service diagnostics from Azure Portal, it reduces the chance of trial and error and expedites problem resolution by recommending potential solutions. The tile for “Diagnostic Tools” > “Availability and Performance” & "Best Practices" > has the detectors that I have highlighted ( and more). If you haven't tried these already, you may run those to fetch recommendations and possible causes.

Just as an example - For e.g SNAT Port Exhaustion would show any SNAT Port exhausion
Mahmudul Hasan 1 Reputation point

2021-05-20T19:27:53.493+00:00

Here is the report.
ajkuma 25,626 Reputation points Microsoft Employee

2021-05-21T09:50:24.39+00:00

Thanks for sharing the report. It looks like from the detectors, no specific issues were identified. As a quick test and as indicated by the diagnostic -kindly scale-up to Standard tier. After the test, you can immediate scale-down to Basic tier as required.

Also, kindly enable diagnostic logging (Application, Web Server, detailed error messages, failed request tracing -logs ) to identify more details on where the underlying issues lies. See, this doc for more details - https://learn.microsoft.com/azure/app-service/troubleshoot-diagnostic-logs - Azure provides built-in diagnostics to assist with debugging an App Service app.
Having mentioned above, I' have followed with you privately to help perform a deeper investigation.
ajkuma 25,626 Reputation points Microsoft Employee

2021-06-19T18:07:28.827+00:00

Posting an update from offline discussions: Currently Linux server image to host the blazor app isn't available. Work is in progress to enable this scenario. We recommend to use own Docker image and deploy it as a custom container if you wish to use Linux App Service to run your application.

1 answer

Tim vd H 1 Reputation point

2021-05-19T14:07:44.043+00:00

Could there be some CORS limitations on your api and/or SignalR endpoint?
It was not visible in the console/network output though.
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Mahmudul Hasan 1 Reputation point

2021-05-19T14:24:41.893+00:00

I didn't touch the code of the app. It's the default template that Visual Studio generates on the project creation.
I created the app and pushed it to Azure to test.

Also yea, nothing shows up in the console.
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Why my website not working properly if I use custom domain?

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