[SOLVED] Does ISPConfig 3 support aspx websites and how to config them?

My server was installed with the HowTo https://www.howtoforge.com/perfect-...2-php-mysql-pureftpd-bind-dovecot-ispconfig-3
ok and it's a multiserver setup. My questions are:
1. Can I host aspx pages and if yes what site config do i need to set?
2. How can I test/view websites before the DNS points on my server? The reason is that I need to test and view a site that is live on a different server but it wants to move to my server with min downtime. Can I also view the page from outside my local network?