Fix Tengine SSL certificate reload failed error
2026-09-29
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When renewing SSL certificates, you run tengine -s reload and get reload failure. This is one of the most common SSL issues for Tengine users.
Common causes
- Certificate file permission problem, Tengine worker cannot read .crt or .key
- Broken certificate file after download or copy
- Wrong file path written in tengine.conf
- Private key file mismatch with certificate
Step 1 Check configuration syntax
Always test config before reload:
/usr/local/tengine/sbin/nginx -t
If nginx -t fails, fix the error message first.
Step2 Check file permission
Your cert and key files should be readable for Tengine user.
ls -l /etc/ssl/yourdomain.crt
ls -l /etc/ssl/yourdomain.key
Recommended permission:
sudo chmod 644 /etc/ssl/yourdomain.crt
sudo chmod 600 /etc/ssl/yourdomain.key
Step3 Verify cert and key match
openssl x509 -noout -modulus -in yourdomain.crt | openssl sha256
openssl rsa -noout -modulus -in yourdomain.key | openssl sha256
The two hash output must be identical.
Step4 Reload Tengine
/usr/local/tengine/sbin/nginx -s reload
Summary
Never skip nginx -t before reload. Most SSL reload errors are permission or file corruption problems, not Tengine bugs.
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