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Could not create ssl tls secure channel .net library api
Hello my friends I write simple winform application for download files from my account dropbox . After few hour exception is raised : Could not create ssl/tls secure channel . I test on vps serve...
Greg-DB
Dropbox Community Moderator
Dropbox Community ModeratorIf there's an issue with the official Dropbox .NET SDK, we'll be happy to look into it, but we'll need some more information. Please reply with:
- the name and version number of the platform and SDK you are using
- the steps to reproduce the issue, including relevant code snippet(s)
- the full text of any error or unexpected output
I've encountered the same issue as you. I managed to fix it by adding the following lines of code
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
before calling the dropbox functions, e.g. in the Main() function of the application.
The error is generic and there are many reasons why the SSL/TLS negotiation may fail. ServicePointManager.SecurityProtocol property selects the version of the Secure Sockets Layer (SSL) or Transport Layer Security (TLS) protocol to use for new connections; existing c# socket connections aren't changed. Make sure the ServicePointManager settings are made before the HttpWebRequest is created, else it will not work. Also, you have to enable other security protocol versions to resolve this issue:
ServicePointManager.Expect100Continue = true;
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12
SecurityProtocolType.Tls
SecurityProtocolType.Tls11
SecurityProtocolType.Ssl3;
//createing HttpWebRequest after ServicePointManager settings
HttpWebRequest request = (HttpWebRequest)WebRequest.Create("https://google.com/api/")If you create HttpWebRequest before the ServicePointManager settings it will fail and shows the error message.
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