Error when get token "The remote certificate is invalid according to the validation procedure"

Question

There are many similar topics with same issue, but nothing relevant to my issue on Identity server. Probably am still failing to understand this. I am trying to implement identity server authentication by recreating this sample

Sample GetToken() method is working fine, but when I call GetToken() method in my application I get error

The remote certificate is invalid according to the validation procedure. I am realy not sure how semple working fine, but my code does not.

This is code

public async Task<ActionResult> GetToken()
{
    var client = new TokenClient(
        "https://localhost:44331/connect/authorize",
        "codeclient",
        "secret");

    var code = Request.QueryString["code"];
    var tempState = await GetTempStateAsync();
    Request.GetOwinContext().Authentication.SignOut("TempState");

    var response = await client.RequestAuthorizationCodeAsync(
        code,
        "http://localhost/UniSrv.Client.Web/callback"
            );

    //... more code
   }

It breaks on RequestAuthorizationCodeAsync. I am using same certificate as sample aplication on identiy server host app. Do I need certificate on client? If yes, why than sample application working without that? Thank for help to resolve this issue.

Answer 1

It looks like SSL Certificate validation failed. Try Using HTTPS on the callback endpoint. Note: https transport security must be enabled when OAuth/OpenId connect tokens are used.