I have a domain that is working fine with LE on the principal machine and now I have a second machine running a second service. Both servers have Apache and run web services. For this reason I have to access to the second server specifing a port different to 80 or 443 and on the principal server I have virtual hosts and a HTTP-301 redirect with index.php to access to the second server (same subdomain but specifing port) and I can create a LE certificate por principal server but not for the second one.
Then, is it possible to create a LE certificate for this second server? I now that I can use DNS challenge and cert only and putting it manually on the server but doing that I cannot renew automatically .