Only my MBP Drops L2TP VPN Connection after 60 Seconds

My Old G4 Laptop and my Dual G5 Tower both connect to my office via L2TP VPN without an issue. with the exact same settings exported over to my mac book pro, the connection drops after exactly 60 seconds. I've tried both wireless and wired connections, and in either case, the VPN drops after 60 seconds of connect time.

I checked with my VPN administrator. He upgraded the XServe to Mac OS 10.4.5, and we tried again, with the same results. He sent me the server log to post:
2006-03-14 14:39:20 PST Listening for connections...
2006-03-14 14:43:44 PST terminating on signal 15
2006-03-14 14:43:44 PST terminating on signal 15
#End-Date: 2006-03-14 14:43:44 PST
#End-Date: 2006-03-14 14:43:44 PST
#Start-Date: 2006-03-14 14:44:55 PST
#Fields: date time s-comment
#Start-Date: 2006-03-14 14:44:55 PST
#Fields: date time s-comment
2006-03-14 14:44:55 PST Loading plugin /System/Library/Extensions/L2TP.ppp
2006-03-14 14:44:55 PST Loading plugin /System/Library/Extensions/PPTP.ppp
2006-03-14 14:44:58 PST Listening for connections...
2006-03-14 14:44:58 PST Listening for connections...
2006-03-14 17:06:52 PST Incoming call... Address given to client = 172.16.6.2
Tue Mar 14 17:06:52 2006 : Directory Services Authentication plugin initialized
Tue Mar 14 17:06:52 2006 : Directory Services Authorization plugin initialized
Tue Mar 14 17:06:52 2006 : PPTP incoming call in progress from 'REDACTED'...
Tue Mar 14 17:06:52 2006 : PPTP connection established.
Tue Mar 14 17:06:52 2006 : using link 0
Tue Mar 14 17:06:52 2006 : Using interface ppp0
Tue Mar 14 17:06:52 2006 : Connect: ppp0 <--> socket[34:17]
Tue Mar 14 17:06:52 2006 : sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MS-v2> <magic 0xe2f50f1d> <pcomp> <accomp>]
Tue Mar 14 17:06:52 2006 : rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x122fcd45> <pcomp> <accomp>]
Tue Mar 14 17:06:52 2006 : lcp_reqci: returning CONFACK.
Tue Mar 14 17:06:52 2006 : sent [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x122fcd45> <pcomp> <accomp>]
Tue Mar 14 17:06:55 2006 : sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap MS-v2> <magic 0xe2f50f1d> <pcomp> <accomp>]
Tue Mar 14 17:06:55 2006 : rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <auth chap MS-v2> <magic 0xe2f50f1d> <pcomp> <accomp>]
Tue Mar 14 17:06:55 2006 : sent [LCP EchoReq id=0x0 magic=0xe2f50f1d]
Tue Mar 14 17:06:55 2006 : sent [CHAP Challenge id=0xbf <cc4af73a9d88941b39418f9c31043e6c>, name = "osxvpn.local"]
Tue Mar 14 17:06:55 2006 : rcvd [LCP EchoReq id=0x0 magic=0x122fcd45]
Tue Mar 14 17:06:55 2006 : sent [LCP EchoRep id=0x0 magic=0xe2f50f1d]
Tue Mar 14 17:06:55 2006 : rcvd [LCP EchoRep id=0x0 magic=0x122fcd45]
Tue Mar 14 17:06:55 2006 : rcvd [CHAP Response id=0xbf <REDACTED>, name = "dpisoni"]
Tue Mar 14 17:06:55 2006 : sent [CHAP Success id=0xbf "S=REDACTED M=Access granted"]
Tue Mar 14 17:06:55 2006 : DSAccessControl plugin: User 'dpisoni' authorized for access
Tue Mar 14 17:06:55 2006 : sent [CCP ConfReq id=0x1 <mppe +H -M +S -L -D -C>]
Tue Mar 14 17:06:55 2006 : rcvd [CCP ConfReq id=0x1 <mppe +H -M +S -L -D -C>]
Tue Mar 14 17:06:55 2006 : sent [CCP ConfAck id=0x1 <mppe +H -M +S -L -D -C>]
Tue Mar 14 17:06:55 2006 : rcvd [CCP ConfAck id=0x1 <mppe +H -M +S -L -D -C>]
Tue Mar 14 17:06:55 2006 : MPPE 128-bit stateless compression enabled
Tue Mar 14 17:06:55 2006 : sent [IPCP ConfReq id=0x1 <addr 172.16.100.51>]
Tue Mar 14 17:06:55 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:06:55 2006 : rcvd [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
Tue Mar 14 17:06:55 2006 : ipcp: returning Configure-NAK
Tue Mar 14 17:06:55 2006 : sent [IPCP ConfNak id=0x1 <addr 172.16.6.2> <ms-dns1 172.16.5.100> <ms-dns3 172.16.5.100>]
Tue Mar 14 17:06:55 2006 : rcvd [IPV6CP ConfReq id=0x1 <addr fe80::0216:cbff:fe89:f062>]
Tue Mar 14 17:06:55 2006 : Unsupported protocol 0x8057 received
Tue Mar 14 17:06:55 2006 : sent [LCP ProtRej id=0x2 80 57 01 01 00 0e 01 0a 02 16 cb ff fe 89 f0 62]
Tue Mar 14 17:06:55 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:06:55 2006 : sent [ACSCP] 04 01 00 0a 01 06 00 00 00 01
Tue Mar 14 17:06:55 2006 : rcvd [IPCP ConfAck id=0x1 <addr 172.16.100.51>]
Tue Mar 14 17:06:55 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:06:55 2006 : rcvd [IPCP ConfReq id=0x2 <addr 172.16.6.2> <ms-dns1 172.16.5.100> <ms-dns3 172.16.5.100>]
Tue Mar 14 17:06:55 2006 : ipcp: returning Configure-ACK
Tue Mar 14 17:06:55 2006 : sent [IPCP ConfAck id=0x2 <addr 172.16.6.2> <ms-dns1 172.16.5.100> <ms-dns3 172.16.5.100>]
Tue Mar 14 17:06:55 2006 : ipcp: up
Tue Mar 14 17:06:55 2006 : found interface en0 for proxy arp
Tue Mar 14 17:06:55 2006 : local IP address 172.16.100.51
Tue Mar 14 17:06:55 2006 : remote IP address 172.16.6.2
Tue Mar 14 17:06:58 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:06:58 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:06:58 2006 : sent [ACSCP] 04 01 00 0a 01 06 00 00 00 01
Tue Mar 14 17:06:58 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:01 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:01 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:01 2006 : sent [ACSCP] 04 01 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:01 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:04 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:04 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:04 2006 : sent [ACSCP] 04 01 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:04 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:07 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:07 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:07 2006 : sent [ACSCP] 04 01 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:07 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:10 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:10 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:10 2006 : sent [ACSCP] 04 01 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:10 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:13 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:13 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:13 2006 : sent [ACSCP] 04 01 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:13 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:16 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:16 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:16 2006 : sent [ACSCP] 04 01 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:16 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:19 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:19 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:19 2006 : sent [ACSCP] 04 01 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:19 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:22 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:22 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:22 2006 : sent [ACSCP] 04 01 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:22 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:25 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:25 2006 : rcvd [ACSCP] 01 02 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:25 2006 : sent [ACSCP] 04 02 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:25 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:28 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:28 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:31 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:31 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:31 2006 : rcvd [ACSCP] 01 02 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:31 2006 : sent [ACSCP] 04 02 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:34 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:34 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:34 2006 : rcvd [ACSCP] 01 02 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:34 2006 : sent [ACSCP] 04 02 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:37 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:37 2006 : rcvd [ACSCP] 01 02 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:37 2006 : sent [ACSCP] 04 02 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:37 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:40 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:40 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:40 2006 : rcvd [ACSCP] 01 02 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:40 2006 : sent [ACSCP] 04 02 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:43 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:43 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:43 2006 : rcvd [ACSCP] 01 02 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:43 2006 : sent [ACSCP] 04 02 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:46 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:46 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:46 2006 : rcvd [ACSCP] 01 02 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:46 2006 : sent [ACSCP] 04 02 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:49 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:49 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:49 2006 : rcvd [ACSCP] 01 02 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:49 2006 : sent [ACSCP] 04 02 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:52 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:52 2006 : rcvd [ACSCP] 01 02 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Tue Mar 14 17:07:52 2006 : sent [ACSCP] 04 02 00 0a 01 06 00 00 00 01
Tue Mar 14 17:07:52 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:55 2006 : sent [ACSCP] 01 01 00 04
Tue Mar 14 17:07:55 2006 : rcvd [ACSCP] 02 01 00 04
Tue Mar 14 17:07:55 2006 : rcvd [LCP TermReq id=0x2 "MPPE disabled"]
Tue Mar 14 17:07:55 2006 : LCP terminated by peer (MPPE disabled)
Tue Mar 14 17:07:55 2006 : ipcp: down
Tue Mar 14 17:07:55 2006 : sent [LCP TermAck id=0x2]
Tue Mar 14 17:07:55 2006 : rcvd [LCP TermReq id=0x3 "MPPE disabled"]
Tue Mar 14 17:07:55 2006 : sent [LCP TermAck id=0x3]
Tue Mar 14 17:07:55 2006 : Connection terminated.
Tue Mar 14 17:07:55 2006 : Connect time 1.1 minutes.
Tue Mar 14 17:07:55 2006 : Sent 0 bytes, received 8176 bytes.
Tue Mar 14 17:07:55 2006 : PPTP disconnecting...
Tue Mar 14 17:07:55 2006 : PPTP disconnected
2006-03-14 17:07:55 PST --> Client with address = 172.16.6.2 has hungup

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