Thanks, for your answer…
Well…We decided for security reasons to keep administration interface just on lan…
Anyway dns looks fine…well…if u digit www.sardegnanuova.com everything works fine…and for webmail.sardegnanuova.com too…but the problem is that everything takes you to the same page (it seems…)…for example webmail… should takes you to https://sardegnanuova.com:20000.
81.208.57.107 is the master dns named "janas4.janas-tech.com" (same machine where virtualmin is running…)
81.208.57.105 is another machine on the network but for the moment doesn’t take part to the project…
Luca Prete