So today was the day we uploaded all our macs to El Capitan: 2 laptops, 2 minis, and our server (with Server app already updated yesterday). Since the update everything is working fine except none of the machines can access the server anymore. They CAN access each other (both file sharing and screen sharing), but the macbook pros don't even see the server and the minis can see it in the sidebar but clicking on it results in a "connection failed" message after attempting to connect for half a minute (also can no longer connect to the server's iTunes library). Nothing was changed on the server settings (in fact, the upgrades were done from cached upgrade files from the cache server) and no network settings were altered in any way. Thoughts?