Venus 6 upgrade HttpRequest error: Could not create SSL/TLS secure channel

I’m trying to use HSLHttp Library version 2.0 to send directly message to slack, using web_hook, and getting a error similar error about the SSL/TLS secure channel.

https://httpbin.org/post works just fine.

It seems to me like maybe it’s a .net error? I’m happy to get any suggestion regarding the OS / .net.

I have Windows 11 Pro, and VENUS 4.5.0.7977 with the following:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\CDF
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v2.0.50727
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4.0

Detailed log:
2024-07-31 11:15:21> HSLHttp : Initialize - progress; Creating Hamilton HTTP object: Hamilton.HSLHttp
2024-07-31 11:15:21> HSLHttp : Initialize - progress; Hamilton HTTP object Created.
2024-07-31 11:15:21> HSLHttp : SetAuthentication - progress; Http Authentication: BearerToken
2024-07-31 11:15:21> HSLHttp : HttpPOST - progress; Request Uri: https://hooks.slack.com/services/XXXX/XXXX/XXXX
2024-07-31 11:15:22> HSLHttp : HttpPOST - progress; Response Status Code: 0
2024-07-31 11:15:22> HSLHttp : HttpPOST - progress; Response Content: System.Net.Http.HttpRequestException: An error occurred while sending the request. —> System.Net.WebException: The request was aborted: Could not create SSL/TLS secure channel. at System.Net.HttpWebRequest.EndGetRequestStream(IAsyncResult asyncResult, TransportContext& context) at System.Net.Http.HttpClientHandler.GetRequestStreamCallback(IAsyncResult ar) — End of inner exception stack trace —