I've been doing some searching on a macOS server and have noticed that there's an open port that I am able to access outside the network. When I go to this port it will ask for a username and a password, once logged in it provides a
Collection listing that looks kinda like the following:
Collection Listing Name Size Last Modified MIME Type .calendarsystem_version 1 2014-Jun-09 09:51 text/plain .well-used/ ? (collection) addressblocks/ ? (collection) user/ ? (collection) apns ? text/html .calendars/ ? (collection) .directory/ ? (collection, addressbook, directory) principals/ ? (collection) timezones ? text/xml (timezones) webcal ? (collection)
My only problem is, I have no idea what this is. It seems to be some sort of listing for development, from what I've gathered with nmap it shows as
8443/tcp open https-alt.
I have two questions regarding this:
- What is this port open for/what is it?
- Would it be a good idea to close this port?