I am using Chrome and Edge to visit a web site that requires client certificate (mTLS). For the first time, both Chrome and Edge pops up a panel that asks me to select a certificate. There was only one to choose, the sole one in my Personal store (Windows 10). I could visit the web site.

After I rebooted my computer, when I tried to do the same, I received a 400 error response with the message "No required SSL certificate was sent". How do I include the certificate in the request again?

1 Answer

If the certificate has disappeared from the Personal store, it should still exist somewhere on your computer from when you received it.

Try to import again the certificate to the Personal store:

• Open Chrome
• Click the three-points menu at the top right corner
• Select Settings > Privacy and security > Manage certificates
• In the Certificates dialog, click Import...
• Click Next, browse to the certificate file
• Continue as indicated to import the certificate.

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