On 11/06/2025 6:31 pm, Y Peng wrote: > Will the Let's Encrypt certificate remain valid for a long time if it > cannot access the internet? 90 days is the lifetime for LE. You can obtain the certificate using another host connected to the Internet and then manually copy the certificate (+Key etc) over to your Isolated machine. As noted by the first response, you probably don't need an LE cert if you are in isolation and only talking Internally. Mal