Server VPN not forwarding traffic after upgrade to Sierra

I don't find any logs for process -> pppd. Searching racoon I find successful connections. In the server logs, I don't see anything that stands out...

Mon Sep 26 21:28:41 2016 : sent [IPCP ConfReq id=0x1 <addr 199.19.xxx.xxx>]

Mon Sep 26 21:28:41 2016 : sent [ACSCP ConfReq id=0x1]

Mon Sep 26 21:28:41 2016 : rcvd [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]

Mon Sep 26 21:28:41 2016 : ipcp: returning Configure-NAK

Mon Sep 26 21:28:41 2016 : sent [IPCP ConfNak id=0x1 <addr 10.0.0.151> <ms-dns1 10.0.0.1> <ms-dns3 10.0.0.1>]

Mon Sep 26 21:28:41 2016 : rcvd [LCP ProtRej id=0x2 82 35 01 01 00 04]

Mon Sep 26 21:28:41 2016 : rcvd [IPV6CP ConfReq id=0x1 <addr fe80::6aa8:6dff:fe00:06b6>]

Mon Sep 26 21:28:41 2016 : Unsupported protocol 0x8057 received

Mon Sep 26 21:28:41 2016 : sent [LCP ProtRej id=0x2 80 57 01 01 00 0e 01 0a 6a a8 6d ff fe 00 06 b6]

Mon Sep 26 21:28:41 2016 : rcvd [IPCP ConfAck id=0x1 <addr 199.19.xxx.xxx>]

Mon Sep 26 21:28:41 2016 : rcvd [IPCP ConfReq id=0x2 <addr 10.0.0.151> <ms-dns1 10.0.0.1> <ms-dns3 10.0.0.1>]

Mon Sep 26 21:28:41 2016 : ipcp: returning Configure-ACK

Mon Sep 26 21:28:41 2016 : sent [IPCP ConfAck id=0x2 <addr 10.0.0.151> <ms-dns1 10.0.0.1> <ms-dns3 10.0.0.1>]

Mon Sep 26 21:28:41 2016 : ipcp: up

Mon Sep 26 21:28:41 2016 : found interface vlan0 for proxy arp

Mon Sep 26 21:28:41 2016 : local IP address 199.19.xxx.xxx

Mon Sep 26 21:28:41 2016 : remote IP address 10.0.0.151

Mon Sep 26 21:28:41 2016 : Received protocol dictionaries

Mon Sep 26 21:28:41 2016 : Received acsp/dhcp dictionaries

Mon Sep 26 21:28:41 2016 : Committed PPP store

Mon Sep 26 21:28:41 2016 : Received acsp/dhcp dictionaries

Mon Sep 26 21:28:41 2016 : Committed PPP store

Mon Sep 26 21:28:41 2016 : l2tp_wait_input: Address added. previous interface setting (name: en0, address: 199.19.xxx.xxx), current interface setting (name: ppp0, family: PPP, address: 199.19.xxx.xxx, subnet: 255.255.255.0, destination: 10.0.0.151).

Mon Sep 26 21:29:33 2016 : rcvd [LCP TermReq id=0x3 "User request"]

Mon Sep 26 21:29:33 2016 : LCP terminated by peer (User request)

Mon Sep 26 21:29:33 2016 : ipcp: down

Mon Sep 26 21:29:33 2016 : sent [LCP TermAck id=0x3]

Mon Sep 26 21:29:33 2016 : l2tp_wait_input: Address deleted. previous interface setting (name: en0, address: 199.19.xxx.xxx), deleted interface setting (name: ppp0, family: PPP, address: 199.19.xxx.xxx, subnet: 255.255.255.0, destination: 10.0.0.151).

Mon Sep 26 21:29:33 2016 : L2TP received CDN

Mon Sep 26 21:29:33 2016 : Connection terminated.

Mon Sep 26 21:29:33 2016 : Connect time 0.9 minutes.

Mon Sep 26 21:29:33 2016 : Sent 10433 bytes, received 57601 bytes.

Mon Sep 26 21:29:33 2016 : L2TP disconnecting...

Mon Sep 26 21:29:33 2016 : L2TP disconnected

2016-09-26 21:29:33 PDT --> Client with address = 10.0.0.151 has hungup

The server can access websites. I will comment out the custom NAT rules this evening and see if the problem still exists. I will post results later. Thanks for the assistance.

No luck. I have removed the custom rules and still cannot get client traffic to pass through. I am starting from scratch to see if the problem still exists.

It did not help. I have removed/recreated each file, even following the instructions I used to originally set it up (https://macminicolo.net/blog/files/Setup-a-VPN-server-with-El-Capitan-server%20. html) and it is still not working. I guess the I'm going to try a VM that does not have the VPN server configured and see if it works from scratch.