Could not create SSL/TLS secure channel

[mcorbeel]

THIS THREAD CAN BE REMOVED -> OBSOLETE


I'm trying to establish a connection to a server that sends sms messages. To do this I need to use HTTP POST.
The protocol is HTTPS, without certificates, with basic authentication.
I've tried several sample of codes that I found on the internet, but always get " Could not create SSL/TLS secure channel".
What am I missing here?

I use VB.net (VS2010) and the System.Net.WebRequest...