SSL/TLS issue cropped up in old code (visual studio 2013)

[Jet_Black]

I have some software that I wrote a long time ago and it has not been updated at all. The software communicates with a server to send files up and collect files and it worked fine until the 7th October, but on the 9th it broke (I didn't do anything to my software!) Here is a little code snippet of where it goes wrong:

Private Function CookieMonster(ByVal cookiestring As String) As Boolean

Application.DoEvents()
Dim stringlist As String() = cookiestring.Split("=")
Dim request As HttpWebRequest = Nothing

MakeRequest(request, stringlist)

Try
Dim myResponse As WebResponse = Nothing
myResponse = request.GetResponse()]

It's that last line that throws an error:

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

I have tried compiling this in Visual Studio 2019 as well (I just copied the project straight across) but I still can't get it to work and have no idea unfortunately. Does my code need updating? If this isn't enough, I can post other relevant bits.

[TysonLPrice]

Maybe the server was upgraded and now your program needs updated too?

[Jet_Black]

I have a feeling that is the case. I'm looking at the httpwebrequest stuff and one suggestion is using WebClient - I have no experience with that though (it's been 5 years since I've done any programming in any language, never mind VB so I'm really stuck here!). Essentially I have a string I want to upload to a URL in one case and a file I want to intercept from another.

[Inferrd]

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

It could be that you need to specify a higher security protocol level, especially if your OS is pre Windows 8.

See the remarks section in the documentation for the ServicePointManager.SecurityProtocol Property, particularly the fourth paragraph:

Your code should never implicitly depend on using a particular protection level, or on the assumption that a given security level is used by default. If your app depends on the use of a particular security level, you must explicitly specify that level and then check to be sure that it is actually in use on the established connection. Further, your code should be designed to be robust in the face of changes to which protocols are supported, as such changes are often made with little advance notice in order to mitigate emerging threats.