Yosemite server VPN authentication errors

I have tried a couple of different times to set up the VPN feature on OS X Server on Yosemite and can't get it working as it always fails to authenticate. I've searched here and on the web and cannot find a solution (though I've seen a few posts where other people have run into this. Both PPTP and L2P fail. I've pasted in a typical connection failure from the log below. Help would be greatly appreciated! Thanks.

Sat Feb 21 17:27:35 2015 : rcvd [CHAP Response id=0xa0 <97078d4d2c7e31be1597d93d2d943ab2000000000000000095fed4d27bf576de1736ca4a5d0fbe ad59b0a54acc8493cb00>, name = "trippin"]

Sat Feb 21 17:27:35 2015 : DSAuth plugin: unsupported authen authority: recved ShadowHash;HASHLIST:<SALTED-SHA512,SMB-NT,CRAM-MD5,RECOVERABLE,SALTED-SHA512-PB KDF2>, want ApplePasswordServer

Sat Feb 21 17:27:35 2015 : DSAuth plugin: MPPE key required, but its retrieval failed.

Sat Feb 21 17:27:35 2015 : sent [CHAP Failure id=0xa0 "S=A790D9EECD07AE85C40D1364135A1CB9E8242A85 M=Access granted"]

Sat Feb 21 17:27:35 2015 : CHAP peer authentication failed for trippin

Sat Feb 21 17:27:35 2015 : sent [LCP TermReq id=0x2 "Authentication failed"]

Sat Feb 21 17:27:35 2015 : Connection terminated.