# SSL: certificate not yet valid: certificate is not valid until date

- **ID:** `nginx/ssl-certificate-not-yet-valid`
- **Domain:** nginx
- **Category:** auth_error
- **Verification:** ai_generated
- **Fix Rate:** 92%

## Root Cause

The SSL/TLS certificate used by nginx has a notBefore date in the future, so the system clock is ahead or the certificate is not yet valid.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| nginx/1.24.0 | active | — | — |
| nginx/1.22.1 | active | — | — |

## Workarounds

1. **Regenerate the certificate with a correct notBefore date using openssl: openssl x509 -req -in mydomain.csr -signkey mydomain.key -out mydomain.crt -days 365 -startdate $(date -d 'yesterday' +%Y%m%d%H%M%S)Z** (95% success)
   ```
   Regenerate the certificate with a correct notBefore date using openssl: openssl x509 -req -in mydomain.csr -signkey mydomain.key -out mydomain.crt -days 365 -startdate $(date -d 'yesterday' +%Y%m%d%H%M%S)Z
   ```
2. **Verify system date with command 'date' and synchronize using NTP: sudo timedatectl set-ntp true && sudo systemctl restart nginx** (80% success)
   ```
   Verify system date with command 'date' and synchronize using NTP: sudo timedatectl set-ntp true && sudo systemctl restart nginx
   ```
3. **Obtain a new certificate from Let's Encrypt with certbot: sudo certbot renew --force-renewal** (90% success)
   ```
   Obtain a new certificate from Let's Encrypt with certbot: sudo certbot renew --force-renewal
   ```

## Dead Ends

- **** — The certificate file itself is invalid; reloading does not change its notBefore date. (95% fail)
- **** — This controls client certificate verification, not server certificate validity. (85% fail)
- **** — This is a temporary workaround that breaks other time-sensitive services and is not a real fix. (60% fail)