POST request remote URL error "The underlying connection has been closed ... Authentication.authenticationexception ... Invalid Remote certificate "solution

When we sometimes write the POST request URL in code the remote address will report "The underlying connection has been closed: failed to establish a trust relationship for the SSL/TLS secure channel." ---> System.Security.Authentication.AuthenticationException: The remote certificate is not valid according to the verification process . This exception is due to the fact that the domain name used by the remote URL does not have a certificate purchased, so it is resolved in the following way:

PS: Set the "Get or set callback to validate server certificate" before the Create URL is always true, as follows

The POST request must be: System.Net.HttpWebRequest request = (System.Net.HttpWebRequest) System.Net.WebRequest.Create (URL);

Before this code, add: Servicepointmanager.servercertificatevalidationcallback + = remotecertificatevalidate;

The Remotecertificatevalidate event code is as follows:

private static bool Remotecertificatevalidate (object sender, X509Certificate cert,x509chain chain, sslpolicyerrors Error
{
In order to pass certificate validation, always return True
return true;
}

Get

POST request remote URL error "The underlying connection has been closed ... Authentication.authenticationexception ... Invalid Remote certificate "solution