Can not establish L2TP connection to Mac Server via VPN

Hi,
I am asking for some help on this VPN Problem:
since yesterday I have a new Mac mini Server running OS X 10.9.3 and Server Software 3.1.2 - my goal is to reach some deivces in my home network from outside, mainly with the iPhone or iPad.
Dyn.org
I registered with Dyn.com a hostname using my outside IP Address. Server Type: Host with IP Address and used the IP Address presented to me in the stup wizard. This one is shown as active and when I ping or Lookup the Host Name it is responding - so I think I am fine here.
Mac Mini Server
Next I have setup a user on the server who can use VPN. Next I have setup the VPN service with L2TP, using the Host name von dyn.org, a nice shared secret, IP range 10.0.1.190 to 10.0.1.199, DNS 10.0.1.1, no routs.
I exported this as config file to my iPhone.
The VPN Protocol in the Server says, it is listening for connections.
When I turn on VPN on the iPhone it replies always L2TP-VPN-Server has not answered.
AirPort Extreme
The AirPort Extreme is configured by the Server with Ports 500, 1701, 4500 and the Mac Server 10.0.1.26 as Privat IP Address.
The Internet Tab shows Router and DNS as 192.168.211.1 and IPv4 Address as 192.168.211.109
I actually do not understand why I have a 192.168.xxx.xxx DNS and router entry while I have the Privat Network on 10.0.1.xxx
The Protocol for VPN just says nothing at all, besides that it is listening. I guess something is blocking the connection to the server.
By looking at my above configutation - what am I doing wrong? Why do I get this L2TP-VPN-Server error message? I changed the password for the user to be sure I am not miss spelling it. Did not help.
Any idea?
Thank you for your support!
Regards
Klaus-Martin

According to your IP addresses you listed, you might have two devices that are trying to create a NATed network (one in the 10.0.0.0/8 and 192.168.0.0/16 networks). Can you list what devices you have between your server and the Internet?
I'm going to take a guess that you have a router/modem prodived by your ISP, and this is going to give you a 192.168.211.0/24 network (since it set up as a router to provide its own network). You then plugged an Airport into this router and configured it to set up its own wireless network on its own subnet (10.0.1.0/24). The server is on this network, sees the Airport (and lets you configure it). So while your hostname points to your external address (which is good), it's just that external address is the WAN side of the modem/router and not the Airport. I think your network is set up like this: Internet --> ISP modem --> Airport --> Server. If this is the case, you need to set up the ISP modem/router to port forward L2TP ports to your Airport (which in turn, port forward to your server). Or you could set your ISP modem/router into bridge mode and have the Airport dial the connection to the ISP (more complicated).
Have you tried VPN from the local network, say put the phone on wifi and make sure that works? This would be a quick test to make sure the phone and server are set up properly.
Also, have you tried port scanning your host from a computer outside your network, like from an iPhone on celluar? That would help you determine if you have routing configured properly for the L2TP VPN ports.

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