How about the same fix for Regular Mavericks (NON-server versions!)
I had everything working fine until the update to 10.9. Now all my L2TP connections got screwed. Only PPTP is working.
Please help with any usefull tips to get me going again.
(Hint to Apple: Also fix your bug in Maverick (non-server version))
Mac mini, OS X Mavericks (10.9.1), Mini i5 8GB