Had the same issue on my network .. fix was to disable Back to My Mac on any Mac's since UPNP2 would override any port forwards I had setup and let the Mac have the port. Disabled it on the Mac and L2TP connection worked fine from external.
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Had the same issue on my network .. fix was to disable Back to My Mac on any Mac's since UPNP2 would override any port forwards I had setup and let the Mac have the port. Disabled it on the Mac and L2TP connection worked fine from external.