Azure web app iOS notifications are not working.

[madhavanadkat]

When we publish this code on Azure - we are getting below error.

We have talked, azure technical support and they are saying -> your code is trying to write something to server area and that is not possible in azure.

this code is generating error on azure server.
var apns = ApnsClient.CreateUsingJwt(new HttpClient(new WinHttpHandler()), options);

can you help with this, any help is much appreciated.

System.Security.Cryptography.NCryptNative.ImportKey(SafeNCryptProviderHandle provider, Byte[] keyBlob, String format)
at System.Security.Cryptography.CngKey.Import(Byte[] keyBlob, String curveName, CngKeyBlobFormat format, CngProvider provider)
at dotAPNS.ApnsClient.CreateUsingJwt(HttpClient http, ApnsJwtOptions options)
at FileReadDemo.Helper.PushNotification.d__1.MoveNext()

[alexalok]

Please try this workaround.

[mohitdangar]

Add Key into App settings but it doesn't work for me.

Is there any other solution

[madhavanadkat]

hey alex, thanks for reply but its not working still.

[alexalok]

@mohitdangar, if your problem is not related to the one described in the first message, please file a separate issue. Make sure to provide a full stacktrace of the exception.

@madhavanadkat, can you please provide a full stacktrace, including the exception message?

[madhavanadkat]

System.Security.Cryptography.NCryptNative.ImportKey(SafeNCryptProviderHandle provider, Byte[] keyBlob, String format)
at System.Security.Cryptography.CngKey.Import(Byte[] keyBlob, String curveName, CngKeyBlobFormat format, CngProvider provider)
at dotAPNS.ApnsClient.CreateUsingJwt(HttpClient http, ApnsJwtOptions options)
at FileReadDemo.Helper.PushNotification.d__1.MoveNext()

this is the exception and we got from cloud remote debugging.

[madhavanadkat]

alex, we both are in same team, just to avoid confusion.

[alexalok]

alex, we both are in same team, just to avoid confusion.

Oh, sorry, my bad :)

this is the exception and we got from cloud remote debugging.

So there is no exception message shown in the remote debugging? Like in an example below (notice there's a message in the very first line):

System.Exception: This is the exception message.
   at <Program>$.<Main>$(String[] args) in C:\sources\TestyTest\TestyTestConsole\Program.cs:line 8

[mohitdangar]

Exception Message: The system cannot find the file specified.

and its raise from below line
var apns = ApnsClient.CreateUsingJwt(new HttpClient(new WinHttpHandler()), options);

[alexalok]

@mohitdangar, thanks!

Please take a look at this question. Looks like one just cannot use CngKey.Import on Azure when running on a Free/Shared tier. Unfortunately, dotAPNS uses this call during a JWT generation.

There are 2 immediate workarounds for this:

1. Move to a Basic tier.
2. Use a certificate authentication instead of a JWT-based one.

I will try to drop the CngKey.Import usage if I have time next week but unfortunately I cannot promise you I will be able to. I'm not experienced enough in cryptographic features of the .NET ecosystem. Yet I will try my best!

[madhavanadkat]

thanks @alexalok it will be a great help .. thanks for the quick update.

[madhavanadkat]

@alexalok - for now we have converted our Azure plan from shared to basic B plan and notifications are working.

2 things we needs to do, 1st we need to convert azure plan to basic b1 and alos WEBSITE_LOAD_USER_PROFILE = 1 this key in azure app setting.

notifications are working .. for other to help I am updating here.

[alexalok]

Perfect, thanks for sharing!

[alexalok]

Going to close the issue since it seems the proposed workaround did work. Feel free to reopen should you have any more difficulties.