not connecting to server from Debian/Squeeze

I'm trying to connect to a remote Debian/Lenny server from a 
Debian/Squeeze desktop. I can do this from Windows XP using pptp so I'm 
confident the server is configured properly.

I'm getting a "MPPE required, but MS-CHAP[v2] auth not performed." 
message. After turning on debug logging on the pon command, I find a 
sequence:
sent [LCP ConfReq id=0x9 <asyncmap 0x0> <magic 0x62611f1e> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MS-v2> <magic 
0xc2135820> <pcomp> <accomp>]
No auth is possible
sent [LCP ConfRej id=0x1 <auth chap MS-v2>]
rcvd [LCP ConfAck id=0x9 <asyncmap 0x0> <magic 0x62611f1e> <pcomp> <accomp>]
rcvd [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0xc2135820> <pcomp> <accomp>]
sent [LCP ConfAck id=0x2 <asyncmap 0x0> <magic 0xc2135820> <pcomp> <accomp>]
sent [LCP EchoReq id=0x0 magic=0x62611f1e]
MPPE required, but MS-CHAP[v2] auth not performed.
sent [LCP TermReq id=0xa "MPPE required but not available"]
rcvd [LCP EchoReq id=0x0 magic=0xc2135820]
rcvd [LCP TermReq id=0x3 "peer refused to authenticate"]
sent [LCP TermAck id=0x3]
rcvd [LCP TermAck id=0xa]

before getting disconnected. I believe the messages are showing a 
failure to negotiate an ms-chap v2 authentication. However, I'm not sure 
what is wrong. How do I get my workstation to accept ms-chap v2?


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