Symptom
If you use Internet Connect VPN to connect to a server configured for PAP, this message appears in the Internet Connect Log:
"CHAP authentication failed."
Solution
Mac OS X 10.2 Internet Connect VPN uses CHAP to authenticate users with remote Point-to-Point Protocol (PPP) servers. Internet Connect VPN works with MS-CHAP v2 (MPPE-40/128 bit RC4 encryption). Internet Connect VPN does not use PAP.
Internet Connect VPN uses PPTP (Point-to-Point Tunneling Protocol) to provide secure connections with remote networks. Internet Connect VPN does not use IPSec.