We have a issues with our bot
It was working fine during the last 4 months without any errors.
But today we receive the relevant error :
2018-12-17T17:50:25 PID[5736] Error
Error refreshing OpenId configuration: System.InvalidOperationException:
IDX20803: Unable to obtain configuration from: '[PII is hidden]'.
---> System.IO.IOException: IDX20804: Unable to retrieve document from: '[PII is hidden]'.
---> System.Net.Http.HttpRequestException: An error occurred while sending the request.
---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a send.
---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.
---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
The complete log file was shown at this link : https://pastebin.com/ZLx9G9W7
I think it's a exception due too IIS configuration but we have not changed anything on that.
Thanks you in advance.
Okay I have had a phone call with an engineer from Microsoft. They told me BotFramework doesn't support TLS 1.0 anymore and we have to migrate to version 1.2. They have anounced this in a blog post: https://blog.botframework.com/2018/11/06/announcement-azure-bot-service-enforcing-transport-layer-security-tls-1-2/
My bot was fixed by adding this line in the startup code (in my case it was Application_Start in Global.asax.cs):
System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;