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

user_14625753 0
Viewed 78974

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.

postman .net-core api c#
7 Answers

There are 3 places to disable ssl verification:

  1. Request level: make sure it is off

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

enter image description here

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

enter image description here

user_67936370

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.

user_35287740

I had the same issue with the Postman unable to verify the first certificate. The same localhost endpoint worked within a browser, but not in Postman while running in debug in VS. In my case re-installing IIS Express fixed the problem.

user_51801310

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

app.UseAuthentication();
app.UseAuthorization();
user_59673600

If you face this error while Autherization, check your Auth Token first. Could be an issue with your token itself.

Just turning SSL off worked for me.

user_73849120

upload the root ca of the certificate issuer in postman and it will work

user_144555590

When in Development (i.e. localhost) then use http route to your ASP .Net server instead of https and ignore certificates completely. You will save yourself a lot of pain and time just using http for development.

enter image description here

As you see in the picture your App has 2 routes to connect to. Use the http one. (If you don't have one then set it up).

user_134356880
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