Endpoint don't receive a request from skype channel but it's ok in webchat

Question

My API endpoint don't receive any signal from Skype bot service but it's as expected with Web chat when i deploy my code into production. This API using: - .net core 2.2 - Bot builder v4.5.2 - host in IIS 7.5

The API is work fine in both 2 channels web chat & Skype at local using ngrok. At local i see request log in iis log beblow with each agent:

• Skype channel: Microsoft-SkypeBotApi+(Microsoft-BotFramework/3.0)

• Web Chat: BF-DirectLine+(Microsoft-BotFramework/3.2++https://botframework.com/ua)

At the production i only see requests come from Web Chat channel in iis log. I'm not sure about the firewall in production because this is server of 3rd.

I guess about 2 case:

1. the Skype bot service don't send request to my endpoint with a special reason?

2. Skype bot service sent out request but this request could not arrive my API end point (special restrict firewall).

I tried test for many cases but the result is the same:

• I tried use the same bot in at 2 environments (change endpoint URL).
• I tried create new bots.
• I tried deployed the code into another server which i sure about the income & outcome request (result as my expectation at this server).

IIS logs at local:

2019-09-23 04:07:17 ::1 OPTIONS /api/messages - 3978 - ::1 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:69.0)+Gecko/20100101+Firefox/69.0 https://botservice.hosting.portal.azure.net/botservice/?bundlingKind=PopularPartitioner&cacheability=3&extensionName=Microsoft_Azure_BotService&l=en&pageVersion=1.4.0.40&trustedAuthority=portal.azure.com 405 0 0 12

2019-09-23 04:07:32 ::1 POST /api/messages - 3978 - ::1 BF-DirectLine+(Microsoft-BotFramework/3.2++https://botframework.com/ua) - 200 0 0 13008

2019-09-23 04:08:19 ::1 POST /api/messages - 3978 - ::1 Microsoft-SkypeBotApi+(Microsoft-BotFramework/3.0) - 200 0 0 1431

IIS logs at production:

  2019-09-23 03:15:50 10.3.23.6 OPTIONS /api/messages - 7541 - 10.3.254.81 Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:69.0)+Gecko/20100101+Firefox/69.0 405 0 0 78

  2019-09-23 03:23:39 10.3.23.6 POST /api/messages - 7541 - 10.3.254.81 BF-DirectLine+(Microsoft-BotFramework/3.2++https://botframework.com/ua) 200 0 0 5981

Answer 1

The root cause of this issue is my server have not yet enabled TLS 1.2. After I enable TLS 1.2 for this server, every thing work as expected.

This is a requirement for the endpoint: https://blog.botframework.com/2018/11/06/announcement-azure-bot-service-enforcing-transport-layer-security-tls-1-2/