Only my MBP Drops L2TP VPN Connection after 60 Seconds

Did you update to 10.4.5 yet ?
It says it fixes "VPN connections to Cisco servers when using NAT" ...

http://www.apple.com/support/downloads/macosxupdate1045forintel.html

I had a similar problem with my MBP, only with my standard airport extreme. Older Macs and even Win machines have no trouble. The MBP dropped wifi connection repeatedly, constantly, insanely often.

It replicated in the Apple Store at the genius bar, thank heavens. We decided the migration of old content to new MBP might have brought over a problem incompatible with MBP, so... I reinstalled OS using the install disc that shipped with the MBP.

It seems to have sort of taken care of the problem. However, I still lose connection when the darned thing sleeps. Arg. But at least I can work uninterrupted by drops now.

Hope this helps.

several Mac OS X (10.4.5) MacBook Pro

I have the exact same problem, but a Unix person told me that I should be able to delete the config file for the VPN to reset it. I just don't want to reinstall the OS!! There has to be an easier way!

Same thing here. The VPN (IPSec) connexion to my OS X Server (10.4.5) drops after 1 minute with no reason. It works well with a 17" PowerBook (10.4.5).
Here what I have in my Server log :

Mon Mar 13 16:17:03 2006 : sent [CHAP Success id=0x54 "S=5E2DBDB4CF3926DB3D4656B383863B73F47A403F M=Access granted"]
Mon Mar 13 16:17:03 2006 : DSAccessControl plugin: User 'admin' authorized for access
Mon Mar 13 16:17:03 2006 : sent [IPCP ConfReq id=0x1 <addr xx.xx.xx.xx>]
Mon Mar 13 16:17:03 2006 : sent [ACSCP] 01 01 00 04
Mon Mar 13 16:17:03 2006 : rcvd [IPCP ConfReq id=0x1 <addr 0.0.0.0> <ms-dns1 0.0.0.0> <ms-dns3 0.0.0.0>]
Mon Mar 13 16:17:03 2006 : ipcp: returning Configure-NAK
Mon Mar 13 16:17:03 2006 : sent [IPCP ConfNak id=0x1 <addr 192.168.131.159> <ms-dns1 194.2.0.20> <ms-dns3 194.2.0.50>]
Mon Mar 13 16:17:03 2006 : rcvd [IPV6CP ConfReq id=0x1 <addr fe80::0216:cbff:fe8b:d4d7>]
Mon Mar 13 16:17:03 2006 : Unsupported protocol 0x8057 received
Mon Mar 13 16:17:03 2006 : sent [LCP ProtRej id=0x2 80 57 01 01 00 0e 01 0a 02 16 cb ff fe 8b d4 d7]
Mon Mar 13 16:17:03 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Mon Mar 13 16:17:03 2006 : sent [ACSCP] 04 01 00 0a 02 06 00 00 00 01
Mon Mar 13 16:17:03 2006 : rcvd [IPCP ConfAck id=0x1 <addr xx.xx.xx.xx>]
Mon Mar 13 16:17:03 2006 : rcvd [ACSCP] 02 01 00 04
Mon Mar 13 16:17:03 2006 : rcvd [IPCP ConfReq id=0x2 <addr 192.168.xx.xx> <ms-dns1 194.2.0.20> <ms-dns3 194.2.0.50>]
Mon Mar 13 16:17:03 2006 : ipcp: returning Configure-ACK
Mon Mar 13 16:17:03 2006 : sent [IPCP ConfAck id=0x2 <addr 192.168.xx.xx> <ms-dns1 194.2.0.20> <ms-dns3 194.2.0.50>]
Mon Mar 13 16:17:03 2006 : ipcp: up
Mon Mar 13 16:17:03 2006 : found interface en0 for proxy arp
Mon Mar 13 16:17:03 2006 : local IP address xx.xx.xx.xx
Mon Mar 13 16:17:03 2006 : remote IP address 192.168.xx.xx
Mon Mar 13 16:17:06 2006 : rcvd [ACSCP] 01 01 00 10 01 06 00 00 00 01 02 06 00 00 00 01
Mon Mar 13 16:17:06 2006 : sent [ACSCP] 04 01 00 0a 02 06 00 00 00 01
Mon Mar 13 16:17:06 2006 : sent [ACSCP] 01 01 00 04
Mon Mar 13 16:17:06 2006 : rcvd [ACSCP] 02 01 00 04

.... last 4 lines repeated many times ...

Mon Mar 13 16:18:03 2006 : rcvd [LCP TermReq id=0x2 "No network protocols running"]
Mon Mar 13 16:18:03 2006 : LCP terminated by peer (No network protocols running)
Mon Mar 13 16:18:03 2006 : ipcp: down
Mon Mar 13 16:18:03 2006 : sent [LCP TermAck id=0x2]
Mon Mar 13 16:18:06 2006 : Connection terminated.
Mon Mar 13 16:18:06 2006 : Connect time 1.0 minutes.
Mon Mar 13 16:18:06 2006 : Sent 0 bytes, received 2216 bytes.
Mon Mar 13 16:18:06 2006 : L2TP disconnecting...
Mon Mar 13 16:18:06 2006 : L2TP disconnected
2006-03-13 16:18:06 CET --> Client with address = 192.168.xx.xx has hungup

MacBook Pro 1,8 Ghz Mac OS X (10.4.5)

I also have this problem attempting to connect to an XServe VPN over PPTP. During the 60 seconds, the connection appears to work fine, up until the point it shuts down. This server worked fine with my Powerbook G4. Connection log:

Mon Mar 13 07:11:23 2006 : PPTP connecting to server 'REDACTED' (216.52.235.16)...
Mon Mar 13 07:11:23 2006 : PPTP connection established.
Mon Mar 13 07:11:23 2006 : Using interface ppp0
Mon Mar 13 07:11:24 2006 : Connect: ppp0 <--> socket[34:17]
Mon Mar 13 07:11:26 2006 : MPPE 128-bit stateless compression enabled
Mon Mar 13 07:11:27 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:11:27 2006 : local IP address 172.16.6.11
Mon Mar 13 07:11:27 2006 : remote IP address 172.16.100.51
Mon Mar 13 07:11:27 2006 : primary DNS address 172.16.5.100
Mon Mar 13 07:11:27 2006 : secondary DNS address 172.16.5.100
Mon Mar 13 07:11:29 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:11:33 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:11:36 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:11:39 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:11:42 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:11:45 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:11:48 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:11:51 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:11:53 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:11:56 2006 : acscp: timeout sending Config-Requests
Mon Mar 13 07:11:57 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:12:00 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:12:03 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:12:06 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:12:09 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:12:12 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:12:15 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:12:18 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:12:21 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:12:24 2006 : Received bad configure-nak/rej: 01 06 00 00 00 01
Mon Mar 13 07:12:27 2006 : acscp: timeout sending Config-Requests
Mon Mar 13 07:12:27 2006 : MPPE disabled
Mon Mar 13 07:12:27 2006 : Connection terminated.
Mon Mar 13 07:12:27 2006 : Connect time 1.1 minutes.
Mon Mar 13 07:12:27 2006 : Sent 76334 bytes, received 1293192 bytes.
Mon Mar 13 07:12:27 2006 : PPTP disconnecting...
Mon Mar 13 07:12:27 2006 : PPTP disconnected


MacBook Pro Mac OS X (10.4.5) 2GB RAM

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

So, I am hitting the same problem. The interesting thing is, connecting from my MBP to the VPN (PPTP) on my office's 10.3.9 server drops after 60 seconds exactly, but I am able to connect to another PPTP VPN server (I believe it is on a Windows or Linux machine) with no problems.

Yeah, I didn't have this problem with our Windoze PPTP VPN. I have other problems with it though, that happened back with my Powerbook G4 as well. (Basically, connections would get "stale" without disconnecting after an indeterminate amount of time varying from minutes to hours.) Totally different behavior though.

I have been having the same problem and decided to call AppleCare. They told me that this is a know problem (Intel only) and will be fixed in the near future. In the mean time disabling ACSP (Apple Client Server Protocol) on the server will allow the connection to complete. The command to do this on the server is:

sudo serveradmin settings vpn:Servers:com.apple.ppp.l2tp:PPP:ACSPEnabled=0

My testing has only found one side effect and that is that you will have to fully qualify all machine names instead of just using the hostname. During the negotiation of the L2TP connection the server will pass the dns settings and the domain name, but with ACSP disabled the domain name does not get passed to the client. This is so far the only side effect I have found with about 2 hours of testing and it will effect both Intel and PowerPC systems. It is however a minor inconvenience that will go away when this is fixed.


MacBook Pro Mac OS X (10.4.5)

I wanted to also mention that I have only tried this with L2TP but the same setting also exists for PPTP and it may fix the problem for those of you experiencing this with PPTP connections. The server command for PPTP is:

sudo serveradmin settings vpn:Servers:com.apple.ppp.pptp:PPP:ACSPEnabled=0

I have not tested this as I do not use PPTP on my server but in theory it should have the same effect as it does for L2TP.

MacBook Pro Mac OS X (10.4.5)

This is now fixed in 10.4.6 which was released today. Way to go Apple!

MacBook Pro Mac OS X (10.4.5)