OS X Server VPN not working

Hi
I have had a problem when trying to set up the vpn service on os x server. I use OS X Mountain Lion server. The problem is that when I set up the vpn service in the server app, it won't let me connect to the vpn using my public ip address or outside my network. It will work if I type in the IPV4 address of the server inside the network. It just won't work outside the network. I looked up the port number for OS X Server VPN and did the port-forwarding in the router. Unless i have the port wrong (which is doubt), why would this not be working. I am using L2TP to connect to the server but I have also tried PPTP and that did not work either. I think that the problem must be something with getting the vpn on the internet since it works perfectly fine inside the network.
Thanks for any help.
Michael

If you have a port-mirroring switch (I use a Netgear GS105E), it is very handy.
This is the typical configuration for a VPN. Let us assume L2TP.
VPN Client (L2TP) -> WAN Router/Firewall (Outside) -> LAN Port Forwarding (inside) -> VPN Server (LNS = OS X server).
You may not be able decrypt packets, but you can see outer headers. If the WAN Router/Gateway has port mirroring functions, you can watch incoming packets at the WAN Interface. The Router/Gateway should just forward packets to the designated Port/IP.
If the packets make it past the Router/Gateway, the Server configuration should be checked. Temporarily, you can turn off the firewall and see if you can get to the OS X server. It will help in pinpointing where the issue might be. Shared secrets should also be checked.
If you are able to VPN from inside, it is a very strange configuration. Usually coming from inside to inside is not permitted.
If the clients and servers use the same intranet addresses, for example the client uses 192.168.x.x and the server is also on 192.168.x.x, you will run into issues. You may need to reserve address space for VPN clients.

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vpn:Servers:com.apple.ppp.pptp:IPv4:OfferedRouteTypes = _empty_array
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vpn:Servers:com.apple.ppp.l2tp:Radius:Servers:_array_index:1:SharedSecret = "2"
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vpn:Servers:com.apple.ppp.l2tp:PPP:AuthenticatorACLPlugins:_array_index:0 = "DSACL"
vpn:Servers:com.apple.ppp.l2tp:PPP:VerboseLogging = 1
vpn:Servers:com.apple.ppp.l2tp:PPP:IPCPCompressionVJ = 0
vpn:Servers:com.apple.ppp.l2tp:PPP:ACSPEnabled = 1
vpn:Servers:com.apple.ppp.l2tp:PPP:LCPEchoInterval = 60
vpn:Servers:com.apple.ppp.l2tp:PPP:LCPEchoEnabled = 1
vpn:Servers:com.apple.ppp.l2tp:PPP:AuthenticatorProtocol:_array_index:0 = "MSCHAP2"
vpn:Servers:com.apple.ppp.l2tp:PPP:AuthenticatorPlugins:_array_index:0 = "DSAuth"
vpn:Servers:com.apple.ppp.l2tp:PPP:Logfile = "/var/log/ppp/vpnd.log"
vpn:Servers:com.apple.ppp.l2tp:PPP:DisconnectOnIdleTimer = 7200
vpn:Servers:com.apple.ppp.l2tp:IPSec:SharedSecretEncryption = "Keychain"
vpn:Servers:com.apple.ppp.l2tp:IPSec:LocalIdentifier = ""
vpn:Servers:com.apple.ppp.l2tp:IPSec:SharedSecret = "com.apple.ppp.l2tp"
vpn:Servers:com.apple.ppp.l2tp:IPSec:AuthenticationMethod = "SharedSecret"
vpn:Servers:com.apple.ppp.l2tp:IPSec:RemoteIdentifier = ""
vpn:Servers:com.apple.ppp.l2tp:IPSec:IdentifierVerification = "None"
vpn:Servers:com.apple.ppp.l2tp:IPSec:LocalCertificate = <>
vpn:Servers:com.apple.ppp.l2tp:IPv4:ConfigMethod = "Manual"
vpn:Servers:com.apple.ppp.l2tp:IPv4:DestAddressRanges:_array_index:0 = "192.168.15.241"
vpn:Servers:com.apple.ppp.l2tp:IPv4:DestAddressRanges:_array_index:1 = "192.168.15.249"
vpn:Servers:com.apple.ppp.l2tp:IPv4:OfferedRouteAddresses = _empty_array
vpn:Servers:com.apple.ppp.l2tp:IPv4:OfferedRouteTypes = _empty_array
vpn:Servers:com.apple.ppp.l2tp:IPv4:OfferedRouteMasks = _empty_array
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Issue is resolved. I used the initial random generated shared secret that was generated by Lion Server. The shared secret has special characters. IOS did not like the special characters. See iPhone Console Log below:
Jul 26 20:00:36 iPhone-4 racoon[718] <Info>: [718] INFO: @(#)This product linked OpenSSL 0.9.7l 28 Sep 2006 (http://www.openssl.org/)
Jul 26 20:00:36 iPhone-4 racoon[718] <Info>: [718] INFO: Reading configuration from "/etc/racoon/racoon.conf"
Jul 26 20:00:36 iPhone-4 racoon[718] <Info>: [718] ERROR: /var/run/racoon/68.9.232.78.conf:6: "?gLA" syntax error
Jul 26 20:00:36 iPhone-4 racoon[718] <Info>: [718] ERROR: fatal parse failure (1 errors)
That is why I never saw any attempt to connect. The actual process would bomb out before attempting to make a connection to the server.
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Y|WNwvM_O"?gLA$F@adT
Looks like it was the " or the ? symbols.
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Figured I'd let you all know

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I have experienced exactly same problem, and I found this page.
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Summary
Click following link and install it. OS X Server 3.2.2
ps. Sorry for my bad English.

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