VB. NET: The request was aborted: Could not create SSL/TLS secure channel

Question

I have an application coded in VB.net that has this method of accessing Webservice, i have this error and after searching fixes i still have no luck.

Error: The requ

Answer 1

I'm going to add something here in case it helps others. I have to support some legacy code that is written in VB.Net and targets .NET Framework 4.6.1. The same piece of code runs in both an .exe, and in IIS as a web page.

In the website, this call:

Dim dataStream As Stream = request.GetRequestStream()

would throw this exception

The request was aborted: Could not create SSL/TLS secure channel.

but it worked fine in the .exe.

Forcing the TLS protocol fixed it in the website.

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12

Of course if the host ever deems TLS 1.2 unworthy I'll have to fix/recompile/redeploy, but it solved the error for now.

Answer 2

Obviously the URL you're calling requires TLS 1.1 or TLS 1.2.

You can enable TLS 1.1 or TLS 1.2 by setting the security-protocol with ServicePointManager.SecurityProtocol:

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12

.NET 4.0 supports up to TLS 1.0 while .NET 4.5 or higher supports up to TLS 1.2
For reference:

• Default SecurityProtocol in .NET 4.5
• Are there .NET implementation of TLS 1.2?