This means that Lets Encrypt wont be able to obtain the token from the server and validate it.This however is not exactly secure, since the entire traffic between your computer and your server is transmitted in plain text (even passwords).So an attacker could obtain sensitive data as soon as they manage to break into your local network.
I use Apache 2 on Ubuntu Server but other Linux distros work too. Lets Encrypt only supports creating certificates that are associated with a domain. If you dont own a domain yet, you can register one for cheap. I have even seen some registrars offering free domains, which are sufficient for this project. Therefore you will have to give your server a domain (like myserver.example.com). Dont worry, your server wont be accessible from outside your network, since well only point that domains DNS record to a local IP address. ![]() To do that, just enter following command into your servers shell. If you dont want to use a subdomain but make the server available directly at example.com, just enter an as the host. By default this is located in etcapache2sites-available000-default.conf. If you never changed the configurations it should look about like this. Just insert the ServerName option into the file so that it looks like this. If your server is reachable by its IP address but not by the domain, you might have to set an exception in your routers configuration. If youre running a Linux distro that features the APT package manager, you just run following command for installing it. Set Up Intranet How To Install CertbotCertbots website has a nice command generator which you can use to find out how to install Certbot on you OS. Lets Encrypt needs to verify that we own the website that we want to generate the certificate for. This is neccessary, so that an attacker cannot generate a certificate for your website and thereby steal your visitors data by a man-in-the-middle attack (Im not going into detail about this). Lets Encrypt will then visit this our website and obtain the token from there. If its the same token that Cerbot transmitted to Lets Encrypt, then Lets Encrypt knows that we are the legitimate owner of the website. DNS-01 challenge: For this challenge Certbot will hand us the token it generated. We then have to create a new DNS record (a TXT record) that contains this token. Lets Encrypt will then make a DNS request for our domain and check if the record with the token exists and matches with the token that Certbot transmitted to Lets Encrypt. If that is the case, Lets Encrypt knows that we own the domain. Utf 8 character setIn fact it is easier (and also easier to automate), but there is a problem: Since our server is only available on our local network, Lets Encrypt cannot access it.
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