PMS uses a service called MyPlex for any Plex clients you have outside of your LAN (like iPhones, iPads or roaming MacBooks) to connect to PMS easily.

For this MyPlex-service to work I have made a Port Mapping in my Airport Extreme (AEX) pointing to my Mac Mini running PMS-software.

Although the Port Mapping looks as if it set correctly within Airport Utility, a port scan reveals that it isnt.

The Firewall in OS X server is off, according to System Preferences, but I figured that Apples Adaptive Firewall is blocking access through this port.

When the block was released and I could VPN back into my server I also noticed that mounted Network shares from within the LAN were ejected.

I dont know where to look to confirm wether or not it is true that the Adaptive Firewall is blocking, but maybe some of you can point out where to look.

Also I would like to learn how I can open up a specific port in OS X ServerMavericks, maybe using Terminal.

The things I found on the internet use the ipfw-command, which is deprecated in Mavericks.

Can anyone help me Many tanks in advance, Jannem System Information: Mac Mini (2009) running OS X Mavericks 10.9.4 (13E28) Airport Extreme (4th gen), Firmware 7.6.4 Plex Media Server, version 0.9.9.12.504-3e7f93c Note: the AEX is behind a cable modem which is in Bridge Modus.

An application or process is blocked unless it is given access in the list.

As for as port forwarding is concerned that must be configured in the router.

If its just a modem then the AEX is acting as the router in which case it should be configured there.

It blocks IP addresses that have tried and failed to log in to services too many times.

Port forwarding will only work if the server has a static address on the local network.

The built-in Firewall is switched off, so that should not hinder PMS.

I checked wether there was an exception for PMS when the firewall was switched on and there is; incoming connections are accepted for PMS, even when the firewall is switched on.

Also, the server has a static IP-address, of course, as it handles a few other services for client computers: my AEX has several reserved IP-addresses for network computers based on their MAC-addresses and this has never let me down.

The Port Mapping to the server is correct and corresponds to the static IP-address of the server.

Somehow OS X server (or something) seems to hinder or block the Port Mapping, as another Port Mapping to a second PMS running on a Synology NAS works just fine.

I even experimented by editingswitching the IP-addresses of the server and the NAS in the Port Mapping: the Port Mapping that points to the server does not open up, whereas the Port Mapping to the NAS is registered with every Port Scan that I make, on every edit.

So, for instance if I open external port 32401 up to point at the static IP of the NAS and port 32402 at static IP of the server, only port 32401 registers as opened upon a port scan.

If I switch 32401 to point at the server and 32402 at the NAS, then only 32402 is found open by a port scan.

BTW, both internal ports are both set at 32400 as the PMS-software expects incoming connections at this port.

So if it is not the adaptive firewall, and Port Mapping seems to work for one network client, then why not for the computer running OS X Server Any ideas or advices are very welcome.

Thanks.

Mac Open Up Firewall Access For Port