The underlying connection was closed: An unexpected error occurred on a send.

[kellyrford]

Followed the example to the letter and the above error message was returned for all calls to httpClient.PostAsync.

Finally resolved the problem. Need to add this line above the call:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

[jmprieur]

Hi @kellyrford : this is not the right fix. See https://docs.microsoft.com/en-us/dotnet/framework/network-programming/tls
What we need to do is change the project to be a .NET Framework to be 4.7+
cc: @kalyankrishna1 @TiagoBrenck

[TiagoBrenck]

@jmprieur this sample is already .NET 4.7.2. Check this PR: 14f9136

[jmprieur]

@kellyrford : did you change the version of the .NET framework in the project?
cc: @TiagoBrenck

[kellyrford]

I did not change the .NET framework of the project. It is 4.7.2 Get Outlook for Android<https://aka.ms/ghei36>

…

________________________________ From: Jean-Marc Prieur <notifications@github.com> Sent: Wednesday, July 24, 2019 7:00:23 PM To: Azure-Samples/active-directory-dotnet-daemon <active-directory-dotnet-daemon@noreply.github.com> Cc: kellyrford <kellyford@outlook.com>; Mention <mention@noreply.github.com> Subject: Re: [Azure-Samples/active-directory-dotnet-daemon] The underlying connection was closed: An unexpected error occurred on a send. (#41) @kellyrford<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fkellyrford&data=02%7C01%7C%7Ccf96954a521f4e4d133608d7108ab669%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636996060257848351&sdata=kr3m5th8TFic18S1mZLPyAv3dBR8%2BogRCgnjnKjn004%3D&reserved=0> : did you change the version of the .NET framework in the project? cc: @TiagoBrenck<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FTiagoBrenck&data=02%7C01%7C%7Ccf96954a521f4e4d133608d7108ab669%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636996060257858356&sdata=tTMMzVv3DNJZJSPBcs7xPGcYbYFobZ8%2FPQHmqoTF4QE%3D&reserved=0> — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FAzure-Samples%2Factive-directory-dotnet-daemon%2Fissues%2F41%3Femail_source%3Dnotifications%26email_token%3DAJMVOT5FHWTZFDCITSO2ZITQBDNIPA5CNFSM4IGTQ6Y2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD2X263A%23issuecomment-514830188&data=02%7C01%7C%7Ccf96954a521f4e4d133608d7108ab669%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636996060257868361&sdata=zRIzm%2B0r7OgOIg6kqU3fC0in4xNxtv6jVnqDUg3gnkI%3D&reserved=0>, or mute the thread<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAJMVOT6OVGAMYFFT6ZXBFA3QBDNIPANCNFSM4IGTQ6YQ&data=02%7C01%7C%7Ccf96954a521f4e4d133608d7108ab669%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636996060257878372&sdata=gP8awMTuMQI0NKfM%2FDRFQaLsbLYfRrtiGDsr1EIeYko%3D&reserved=0>.

[TiagoBrenck]

@kellyrford I believe you are having this problem when you deploy to Azure right?
On the step to create the web app resource, Azure AD asks you to select a Runtime stack. What option did you choose?

[TiagoBrenck]

@kellyrford should I close this issue?

[kellyrford]

Yes. It is fine to close it. Not sure why it was not detecting the right tls version but without declaring it, the azure site would reject the connection. Get Outlook for Android<https://aka.ms/ghei36>

…

________________________________ From: Jean-Marc Prieur <notifications@github.com> Sent: Monday, August 26, 2019 8:26:50 AM To: Azure-Samples/active-directory-dotnet-daemon <active-directory-dotnet-daemon@noreply.github.com> Cc: kellyrford <kellyford@outlook.com>; Mention <mention@noreply.github.com> Subject: Re: [Azure-Samples/active-directory-dotnet-daemon] The underlying connection was closed: An unexpected error occurred on a send. (#41) Closed #41<https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FAzure-Samples%2Factive-directory-dotnet-daemon%2Fissues%2F41&data=02%7C01%7C%7C9f0cb5d969ea4780098e08d72a20abfe%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637024192113327817&sdata=IPt1atiHibiaWBQ7lWetxFyH36Nb9ZoiesoWJo2txMI%3D&reserved=0>. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2FAzure-Samples%2Factive-directory-dotnet-daemon%2Fissues%2F41%3Femail_source%3Dnotifications%26email_token%3DAJMVOTZ6772Z3WJQZA7GLLDQGPDYVA5CNFSM4IGTQ6Y2YY3PNVWWK3TUL52HS4DFWZEXG43VMVCXMZLOORHG65DJMZUWGYLUNFXW5KTDN5WW2ZLOORPWSZGOTH6UVEA%23event-2583513744&data=02%7C01%7C%7C9f0cb5d969ea4780098e08d72a20abfe%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637024192113327817&sdata=A7lVJeUIcC28ls0Gyd%2BG1uFUpMMjFxaXHEFQaaAh3LE%3D&reserved=0>, or mute the thread<https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAJMVOT7IBQVKXQKO6U52ZWTQGPDYVANCNFSM4IGTQ6YQ&data=02%7C01%7C%7C9f0cb5d969ea4780098e08d72a20abfe%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637024192113337826&sdata=PSHbzUnT6SqOVN0UlXc4iowj2EWDHeaBftfUDVg88yo%3D&reserved=0>.