NOTE: I've never written vb.net code before this. I've googled for a solution but did not find anything that worked.
I'm trying to get access token from Salesforce. Below code worked just yesterday. And I have no idea why it is not working today. I've tried adding content-type as application/x-www-form-urlencoded but it did not work either. When I use curl I'm able to get access token. Also I'm able to get access token using advanced rest client in google chrome. Any ideas why it is returning 400 Bad Request unknown error retry your request?
Dim clientId As String = "clientId"
Dim clientSecret As String = "clientSecret"
Dim redirectUri As String = "https://test.salesforce.com"
Dim environment As String = "https://test.salesforce.com"
Dim tokenUrl As String = ""
Dim username As String = "firstname.lastname@example.org"
Dim password As String = "passwordtoken"
Dim accessToken As String = ""
Dim instanceUrl As String = ""
Console.WriteLine("Getting a token")
tokenUrl = environment + "/services/oauth2/token"
Dim request As WebRequest = WebRequest.Create(tokenUrl)
Dim values As NameValueCollection = New NameValueCollection()
request.Method = "POST"
Dim client = New WebClient()
Dim responseBytes As Byte() = client.UploadValues(tokenUrl, "POST", values)
Dim response As String = Encoding.UTF8.GetString(responseBytes)
Catch ex As Exception
Console.WriteLine("Press any key to close")
Well, appearently problem was about TLS version mismatch. All Salesforce sandboxes refuse TLS 1.0 connections. Our vb.net test code was using TLS 1.0 thus returning an error. It would be great if Salesforce would return better error code.
All I needed to do was add a line of code on top of the code block:
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls11