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Test Certbot renewal without replacing a working certificate
A currently valid HTTPS certificate does not prove that renewal will work. DNS, challenge routing...
Diagnose IPv6 connectivity without changing the network
A service can work over IPv4 while failing over IPv6. A published AAAA record may then cause inte...
Deploy a static website with a rollback directory
Uploading directly over a live website can leave a mixture of old and new files. A separate relea...
Diagnose an incomplete HTTPS certificate chain without disabling verification
A website may open on your laptop while a webhook, game plugin or fresh Linux installation reject...