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Note that Let's Encrypt does require you to have certain ports open at the time of renewal. Our sysadmin tries to not keep unnecessary ports open, which for LE means either opening the port every 60-90 days or keeping that port open permanently. Neither are really optimal.
It does not. There are two validation methods available, HTTP and DNS. HTTP requires port 80 on the target server, but DNS just uses a TXT record on your already existing DNS server. The latter can be used for internal servers not on the Internet.
