L2TP establishes connection (logged on firewall), then client gives up

[AndreK]

According to FW (Fortigate), the connection is established and IP provided - no problem is logged there.
The L2TP client fails, and "closes connection" 1 sec later.

The same configuration worked fine before 13.10.

Here's the log, (only IP modified)
Please say so if I can help testing this problem.

Oct 18 09:09:50.285 ipsec_setup: Stopping Openswan IPsec...
Oct 18 09:09:52.011 xl2tpd[19761]: death_handler: Fatal signal 15 received
Oct 18 09:09:52.011 Stopping xl2tpd: xl2tpd.
Oct 18 09:09:52.036 ipsec_setup: Starting Openswan IPsec U2.6.38/K3.11.0-12-generic...
Oct 18 09:09:52.294 ipsec__plutorun: Starting Pluto subsystem...
Oct 18 09:09:52.303 ipsec__plutorun: adjusting ipsec.d to /etc/ipsec.d
Oct 18 09:09:52.309 recvref[30]: Protocol not available
Oct 18 09:09:52.309 xl2tpd[21785]: This binary does not support kernel L2TP.
Oct 18 09:09:52.309 xl2tpd[21788]: xl2tpd version xl2tpd-1.3.1 started on andre-OptiPlex-990 PID:21788
Oct 18 09:09:52.311 xl2tpd[21788]: Written by Mark Spencer, Copyright (C) 1998, Adtran, Inc.
Oct 18 09:09:52.311 xl2tpd[21788]: Forked by Scott Balmos and David Stipp, (C) 2001
Oct 18 09:09:52.312 xl2tpd[21788]: Inherited by Jeff McAdams, (C) 2002
Oct 18 09:09:52.312 xl2tpd[21788]: Forked again by Xelerance (www.xelerance.com) (C) 2006
Oct 18 09:09:52.312 xl2tpd[21788]: Listening on IP address 0.0.0.0, port 1701
Oct 18 09:09:52.312 Starting xl2tpd: xl2tpd.
Oct 18 09:09:52.389 ipsec__plutorun: 002 added connection description "Valhall"
Oct 18 09:09:52.739 104 "Valhall" #1: STATE_MAIN_I1: initiate
Oct 18 09:09:52.739 003 "Valhall" #1: received Vendor ID payload [RFC 3947] method set to=115
Oct 18 09:09:52.739 003 "Valhall" #1: received Vendor ID payload [Dead Peer Detection]
Oct 18 09:09:52.740 003 "Valhall" #1: ignoring unknown Vendor ID payload [8299031757a36082c6a621de000402a0]
Oct 18 09:09:52.740 106 "Valhall" #1: STATE_MAIN_I2: sent MI2, expecting MR2
Oct 18 09:09:52.740 003 "Valhall" #1: NAT-Traversal: Result using draft-ietf-ipsec-nat-t-ike (MacOS X): i am NATed
Oct 18 09:09:52.740 108 "Valhall" #1: STATE_MAIN_I3: sent MI3, expecting MR3
Oct 18 09:09:52.740 004 "Valhall" #1: STATE_MAIN_I4: ISAKMP SA established {auth=OAKLEY_PRESHARED_KEY cipher=oakley_3des_cbc_192 prf=oakley_sha group=modp1024}
Oct 18 09:09:52.741 117 "Valhall" #2: STATE_QUICK_I1: initiate
Oct 18 09:09:52.741 003 "Valhall" #2: ignoring informational payload, type IPSEC_RESPONDER_LIFETIME msgid=49199769
Oct 18 09:09:52.741 003 "Valhall" #2: NAT-Traversal: received 2 NAT-OA. ignored because peer is not NATed
Oct 18 09:09:52.741 004 "Valhall" #2: STATE_QUICK_I2: sent QI2, IPsec SA established transport mode {ESP=>0xf8e0d163 <0x62566dbe xfrm=3DES_0-HMAC_SHA1 NATOA=none NATD=none DPD=none}
Oct 18 09:09:53.744 xl2tpd[21788]: Connecting to host wpn.dyndns.org, port 1701
Oct 18 09:09:53.816 xl2tpd[21788]: Connection established to xx.xx.199, 1701. Local: 27658, Remote: 11 (ref=0/0).
Oct 18 09:09:53.817 xl2tpd[21788]: Calling on tunnel 27658
Oct 18 09:09:53.921 xl2tpd[21788]: Call established with xx..xx.52.199, Local: 20912, Remote: 12, Serial: 1 (ref=0/0)
Oct 18 09:09:53.921 xl2tpd[21788]: start_pppd: I'm running:
Oct 18 09:09:53.921 xl2tpd[21788]: "/usr/sbin/pppd"
Oct 18 09:09:53.922 xl2tpd[21788]: "passive"
Oct 18 09:09:53.922 xl2tpd[21788]: "nodetach"
Oct 18 09:09:53.922 xl2tpd[21788]: ":"
Oct 18 09:09:53.922 xl2tpd[21788]: "file"
Oct 18 09:09:53.923 xl2tpd[21788]: "/etc/ppp/Valhall.options.xl2tpd"
Oct 18 09:09:53.923 xl2tpd[21788]: "ipparam"
Oct 18 09:09:53.923 xl2tpd[21788]: "xx.xx.52.199"
Oct 18 09:09:53.923 xl2tpd[21788]: "/dev/pts/3"
Oct 18 09:09:53.924 xl2tpd[21841]: start_pppd: Exec of /usr/sbin/pppd failed!
Oct 18 09:09:53.924 xl2tpd[21788]: child_handler : pppd exited for call 12 with code 1
Oct 18 09:09:53.924 xl2tpd[21788]: call_close: Call 20912 to xx.xx.52.199 disconnected
Oct 18 09:09:53.993 xl2tpd[21788]: Terminating pppd: sending TERM signal to pid 21841
Oct 18 09:09:54.026 xl2tpd[21788]: get_call: can't find call 20912 in tunnel 27658#012 (ref=0/0)
Oct 18 09:10:58.878 xl2tpd[21788]: Maximum retries exceeded for tunnel 27658. Closing.
Oct 18 09:10:58.878 [ERROR 410] Connection attempt to 'Valhall' timed out
Oct 18 09:10:58.878 xl2tpd[21788]: Connection 11 closed to xx.xx.52.199, port 1701 (Timeout)
Oct 18 09:11:03.881 xl2tpd[21788]: Unable to deliver closing message for tunnel 27658. Destroying anyway.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.