OS X Server (Mavericks): Clients cannot connect to VPN service using L2TP

With OS X Server (Mavericks), the VPN service may no longer accept L2TP connections. This can happen if the client and server are behind different network address translation (NAT) gateways.
This article has been archived and is no longer updated by Apple.

Update to OS X Mavericks v10.9.1, then install the VPN Update for OS X Server.

This document will be updated as more information becomes available.

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