I have several android tablets at a remote location that I'm trying to connect through an L2TP/IPSEC VPN with PSK. I can connect one device with no problem. Once that device is connected no other device will connect even if the original device isn't connected. If I reboot the server I am able to connected a new device but the problem persist with only once device being allowed to connect. I have made changes to the address pool and I'm now using my local DHCP server. Here's a output of the log file started with the end of the accepted connection to attempting a new connection.
2012:06:18-14:46:16 ProclaimVPN pppd-l2tp[11329]: id="2201" severity="info" sys="SecureNet" sub="vpn" event="Connection started" username="npdemo1" variant="l2tp" srcip="71.22.239.87" virtual_ip="10.1.10.236"
2012:06:18-14:46:16 ProclaimVPN pppd-l2tp[11329]: Script /etc/ppp/ip-up finished (pid 11339), status = 0x0
2012:06:18-14:46:38 ProclaimVPN pluto[10956]: packet from 71.22.239.87:6: received Vendor ID payload [RFC 3947]
2012:06:18-14:46:38 ProclaimVPN pluto[10956]: packet from 71.22.239.87:6: ignoring Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02]
2012:06:18-14:46:38 ProclaimVPN pluto[10956]: packet from 71.22.239.87:6: ignoring Vendor ID payload [draft-ietf-ipsec-nat-t-ike-02_n]
2012:06:18-14:46:38 ProclaimVPN pluto[10956]: packet from 71.22.239.87:6: ignoring Vendor ID payload [draft-ietf-ipsec-nat-t-ike-00]
2012:06:18-14:46:38 ProclaimVPN pluto[10956]: packet from 71.22.239.87:6: ignoring Vendor ID payload [FRAGMENTATION 80000000]
2012:06:18-14:46:38 ProclaimVPN pluto[10956]: "S_for npdemo1"[1] 71.22.239.87:4500 #3: responding to Main Mode from unknown peer 71.22.239.87:4500
2012:06:18-14:46:38 ProclaimVPN pluto[10956]: | NAT-T: new mapping 71.22.239.87:4500/6)
2012:06:18-14:46:38 ProclaimVPN pluto[10956]: "S_for npdemo1"[1] 71.22.239.87:6 #2: ERROR: netlink response for Add SA esp.7cfdddbe@173.165.184.124 included errno 22: Invalid argument
2012:06:18-14:46:39 ProclaimVPN pluto[10956]: "S_for npdemo1"[1] 71.22.239.87:6 #3: NAT-Traversal: Result using RFC 3947: peer is NATed
2012:06:18-14:46:39 ProclaimVPN pluto[10956]: "S_for npdemo1"[1] 71.22.239.87:6 #3: Peer ID is ID_IPV4_ADDR: '192.168.15.251'
2012:06:18-14:46:39 ProclaimVPN pluto[10956]: | NAT-T: new mapping 71.22.239.87:6/1029)
2012:06:18-14:46:39 ProclaimVPN pluto[10956]: "S_for npdemo1"[1] 71.22.239.87:1029 #2: ERROR: netlink response for Add SA esp.7cfdddbe@173.165.184.124 included errno 22: Invalid argument
2012:06:18-14:46:39 ProclaimVPN pluto[10956]: "S_for npdemo1"[3] 71.22.239.87:1029 #3: sent MR3, ISAKMP SA established
2012:06:18-14:46:39 ProclaimVPN pluto[10956]: "S_for npdemo1"[3] 71.22.239.87:1029 #3: ignoring informational payload, type IPSEC_INITIAL_CONTACT
2012:06:18-14:46:40 ProclaimVPN pluto[10956]: "S_for npdemo1"[2] 71.22.239.87:1029 #4: responding to Quick Mode
2012:06:18-14:46:40 ProclaimVPN pluto[10956]: "S_for npdemo1"[2] 71.22.239.87:1029 #4: IPsec SA established {ESP=>0x06bc4cae
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