PowerShell SSL/TLS error with Invoke-RestMethod command

Question

I am trying to access Foreman API in Powershell version 5.1 using Invoke-RestMethod

I get following error:

Invoke-RestMethod : The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.

I tried following command before the this command but it didn't work.

[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

I tried with Tls, Tls11 also but it didn't work.

What version of Windows are you running on?

Mathias R. Jessen
– Mathias R. Jessen

2020-07-16 13:21:36 +00:00
Commented Jul 16, 2020 at 13:21 — Mathias R. Jessen
– Mathias R. Jessen, Commented Jul 16, 2020 at 13:21

Josh Wright · Accepted Answer · 2020-07-16 13:37:55Z

1

Are you connecting to an untrusted SSL certificate by any chance? You probably need to ignore trust errors as well as set the correct TLS version to use.

Add-Type @"
    using System.Net;
    using System.Security.Cryptography.X509Certificates;
    public class TrustAllCertsPolicy : ICertificatePolicy {
        public bool CheckValidationResult(
            ServicePoint srvPoint, X509Certificate certificate,
            WebRequest request, int certificateProblem) {
            return true;
        }
    }
"@
[System.Net.ServicePointManager]::CertificatePolicy = New-Object TrustAllCertsPolicy

answered Jul 16, 2020 at 13:37

Josh Wright

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3 Comments

KP Singh Over a year ago

I tried this but it didn't work. I am getting a different error: The underlying connection was closed: An unexpected error occurred on a send.

Josh Wright Over a year ago

Any chance that you are trying to connect via a Proxy Server? If so, try running this as soon as you open a new PowerShell session, then try the Invoke. Access web using Powershell and Proxy

KP Singh Over a year ago

The same code is working with Powershell Core 6 with -SkipCertificateCheck parameter.

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