Postman error: "Unable to verify the first certificate" when try to get from my .net core api

Question

I have my brand new .NET Core service with API and I want to get list of items inside it. It's hosted on localhost and I always have this error:

16 ms
Warning: Unable to verify the first certificate
Network
Request Headers
User-Agent: PostmanRuntime/7.26.8
Accept: */*
Postman-Token: e64e10c3-8e3a-4b47-9427-d994e2bdc9fd
Host: localhost:44397
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Request Body
Response Headers
Transfer-Encoding: chunked
Server: Microsoft-IIS/10.0
X-Powered-By: ASP.NET
Date: Tue, 19 Ja

n 2021 14:06:14 GMT
Response Body

How to fix it? I disabled/enabled SSL certification but it no helps.

Answer 1

There are 3 places to disable ssl verification:

1. Request level: make sure it is off

2. Global level: (Request level will have precedence)

3. Remove client and CA certificate, turn it to off :

Answer 2

First, your OS (Windows, Mac, Linux) must trust this certificate.

Then, in Postman, go to Settings > Certificates, and enable CA certification, then select the same trusted certificate.

Answer 3

May be you forgotten to add this lines into Program.cs,

app.UseAuthentication();
app.UseAuthorization();