SSL / TLSChrome · Edge
ERR_CERT_AUTHORITY_INVALIDCertificate Authority Invalid
The server's SSL certificate was issued by an authority your browser doesn't trust. This could mean a self-signed cert, an expired root CA, or a MITM attack.
Why this happens
- Self-signed certificate (common in dev environments)
- Certificate issued by a private or internal CA not trusted by the OS
- Antivirus or corporate proxy inserting its own certificate (MITM)
- System date/time is wrong, making valid certs appear untrustworthy
- Root CA was revoked or removed from the trusted store
How to fix it
- 1
Check that your system clock is set correctly
- 2
If on a corporate network, the IT team may need to install a root certificate
- 3
Temporarily disable antivirus HTTPS inspection and retry
- 4
If managing the site, switch to a free Let's Encrypt certificate
- 5
Never click "Proceed anyway" on untrusted certs on banking or sensitive sites
Diagnose it faster
Use our free tools to check whether the issue is on your end or the server's: