An error occurred in the secure channel support - Classic ASP HTTP Request

Question

I have a classic ASP website running on a Windows Server 2012 box. One page makes a HTTP request to another application over https using code like this:

Answer 1

In a Windows Server 2016 Classic ASP script, fetching an HTTPS URL from Windows Server 2012 R2, I recently had to remove SSL 2.0 from SecureProtocols in order to stop this secure channel error -2147012739.

' Use the latest client
Set httpClient = Server.CreateObject("WinHttp.WinHttpRequest.5.1")

' allow only TLS 1.2 or TLS 1.1
Const WHR_SecureProtocols = 9
httpClient.Option(WHR_SecureProtocols) = &h0800 + &h0200 
' Other values: TLS 1.0 &h0080, SSL 3.0 &h0020, SSL 2.0 &h0008 
' NB Including SSL 2.0 stops https to Windows Server 2012 R2 working

' Other options you may want to set, from https://docs.microsoft.com/en-us/windows/desktop/winhttp/winhttprequestoption 

' Ignore certificate errors
Const WHR_SslErrorIgnoreFlags = 4
httpClient.Option(WHR_SslErrorIgnoreFlags) = &h3300 

' Don't bother checking cert, or risking failure if we can't check
Const WHR_EnableCertificateRevocationCheck = 18
httpClient.Option(WHR_EnableCertificateRevocationCheck) = False