Microsoft Root Certificate Authority 2011.cer |top| Jun 2026

This file is a "Trust Anchor"—a self-signed certificate that forms the very top of a chain of trust. It is primarily used by Microsoft to digitally sign Windows system files and software, ensuring that the code you run hasn't been tampered with.

If you are troubleshooting a "certificate chain processed but terminated in a root certificate which is not trusted" error, you may need to install it manually: : You can often find the official file directly from Microsoft's download servers Command Prompt (Admin) tool for a quick installation: microsoft root certificate authority 2011.cer

| Format | Detection | Typical use | |--------|-----------|--------------| | | Starts with 30 82 (ASN.1 sequence) | Linux, Java, manual import | | Base-64 (PEM) | Begins with -----BEGIN CERTIFICATE----- | Email, Apache, text-friendly | This file is a "Trust Anchor"—a self-signed certificate

Modern versions of Windows have transitioned to SHA-2 for this authority, following the retirement of SHA-1 signed content in 2021. Manual Installation Manual Installation certmgr

certmgr.exe /add MicrosoftRootCertificateAuthority2011.cer /s /r localMachine root Use code with caution. Copied to clipboard Important Technical Details Microsoft Root Certificate 2011.cer

The true "story" of this certificate is that for most people, nothing happened.