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This Guideline Shows How to Generate Self-Signed Ssl for Development and Install It on Your Operating System. We use this guideline as a starting point.

Visual studio .Net core setup

Follow guideline

MacOS

Follow guideline

Windows

We need to make a modification in the first step so that 127.0.0.1 works in addition to 'localhost'.

The full and correct steps for Windows are below:

# setup certificate properties including the commonName (DNSName) property for Chrome 58+
$certificate = New-SelfSignedCertificate `
    -Subject localhost `
    -KeyAlgorithm RSA `
    -KeyLength 2048 `
    -NotBefore (Get-Date) `
    -NotAfter (Get-Date).AddYears(2) `
    -CertStoreLocation "cert:CurrentUser\My" `
    -FriendlyName "Localhost Certificate for .NET Core" `
    -HashAlgorithm SHA256 `
    -KeyUsage DigitalSignature, KeyEncipherment, DataEncipherment `
    -TextExtension @("2.5.29.37={text}1.3.6.1.5.5.7.3.1", "2.5.29.17={text}DNS=localhost&IPAddress=127.0.0.1&IPAddress=::1") 
$certificatePath = 'Cert:\CurrentUser\My\' + ($certificate.ThumbPrint)  

# create temporary certificate path
$tmpPath = "C:\tmp"
If(!(test-path $tmpPath))
{
New-Item -ItemType Directory -Force -Path $tmpPath
}

# set certificate password here
$pfxPassword = ConvertTo-SecureString -String "YourSecurePassword" -Force -AsPlainText
$pfxFilePath = "c:\tmp\localhost.pfx"
$cerFilePath = "c:\tmp\localhost.cer"

# create pfx certificate
Export-PfxCertificate -Cert $certificatePath -FilePath $pfxFilePath -Password $pfxPassword
Export-Certificate -Cert $certificatePath -FilePath $cerFilePath

# import the pfx certificate
Import-PfxCertificate -FilePath $pfxFilePath Cert:\LocalMachine\My -Password $pfxPassword -Exportable

# trust the certificate by importing the pfx certificate into your trusted root
Import-Certificate -FilePath $cerFilePath -CertStoreLocation Cert:\CurrentUser\Root

# optionally delete the physical certificates (don’t delete the pfx file as you need to copy this to your app directory)
# Remove-Item $pfxFilePath
Remove-Item $cerFilePath