I’ve been getting an error 807 which caused some trouble. I read various conflicting documents on how to set it up correctly. What has worked for me is:
server ip -0.0.0.0
client IP(s) – 192.168.1.200-210
Chap-Secrets – username * password *
NB: Spaces in the chap secrets!

This worked fine for me, substitude the “client IP(s)” for a range that is ON your lan