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How do I get a valid HTTPS certificate for a box that is behind a firewall and does not have a DNS entry?

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How do I get a valid certificate for a box that is behind a firewall and does not have a DNS entry?

I was looking at letsencrypt.org but currently it looks like a valid DNS entry is needed, of which I don't have.

There is nothing special about my setup, its just a box that is not directly on the internet, no DNS entry but I need HTTPS to run correctly.

How do I generate a trusted certificate base on IP or something?

How can I do that? Thanks,

posted Sep 29, 2016 by anonymous

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2 Answers

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You create a self-signed certificate.

The first time a browser connects, it will give the user a warning. You can suppress that warning when connecting with scripts - either by globally accepting any self-signed certificate or by setting up your own CA that the script tools are scripted to trust.

I believe self-signed work with either IP or with a hostname on your local network.

answer Sep 29, 2016 by Vijay Shukla
0 votes

use most the PKI/SSL tool on the box to generate a certificate signing request (CSR), copy this small test file any way you want (copy/paste from a terminal session? put on a USB stick?) and send it to a certificate authority, they generate a signed certificate, you bring the resulting CRT back and import it back into the server's key store.

if this is https just for private use, you could run your own private root CA, sign your own certificates, it would simply be necessary to import your CA's public key into any browser that you want to trust the signed private keys.

answer Sep 29, 2016 by Kaushik
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