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Asp.net – How to Create HTTPS SSL Certificate on MacOS?

I am using MacOS 15.0 and need to set up a SSL ASP.NET Core developer certificate in order to work on my current project in the Rider IDE. I have no localhost or ASP.NET certificate preexisting in my keychain, but every time I try to run the command(s) in order to create a SSL certificate, I will get an error message such as:

There was an error creating the HTTPS developer certificate.

There are also screenshots with the errors from the IDE and console.

error in console

I have already tried to set up / create the certificate manually in the keychain and running commands in the console, but as soon as I get to the part to import the .pfx file to the keychain ("sudo security import ~/localhost-dev.pfx -k ~/Library/Keychains/login.keychain-db") I will also get an error message despite of using the right / using no password:

security: SecKeychainItemImport: MAC verification failed during PKCS12 import (wrong password?)
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Answers


  1. Chosen as BEST ANSWER
    0

    I have actually found a work-around to add a functioning localhost certificate posted yesterday!

    https://dev.to/michaelcharles/fixing-the-https-developer-certificate-error-in-net-on-macos-sequoia-516h

    Big props to pvasek and kalebzettl (GitHub)!


  2. 0

    Apple introduced a breaking change in macOS that breaks existing .NET SDK. You have to wait for updated .NET SDK releases.

    Workarounds are being collected in this GitHub thread.

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