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PIX VPN not allowing multiple connections from one site

Posted on 2008-10-20
Medium Priority
Last Modified: 2012-05-05
I'm testing a VPN config from home on my laptop and desktop. Both systems connect fine but it seems only one can access the LAN at a time from my home connection. I thought it might have been an issue with Vista on one system but noticed it worked after I shut off the other connection and reconnected.

I've searched the answered questions and found a possible solution "iskamp nat-traversal 20" referencing connections from behind NAT devices. However when I entered this line it did not seem to make a difference. The whole config I built via the PDM. What am I missing or need to remove?

(I also have two previous vpn config Idle-time entries I can't seem to remove "VPN" "MYVPM")

Building configuration...
: Saved
PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 auto
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password ORwbFgCygXFCTltA encrypted
passwd ORwbFgCygXFCTltA encrypted
hostname pix
domain-name domain.com
fixup protocol dns maximum-length 512
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
no fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
access-list 100 permit icmp any any echo-reply
access-list 100 permit tcp any interface outside eq smtp
access-list 100 permit tcp any interface outside eq www
access-list 100 permit tcp any interface outside eq https
access-list 100 permit tcp host 24.45.xx.xx interface outside eq 3389
access-list 100 permit tcp host 63.127.xx.xx interface outside eq 3389
access-list JAMVPN_splitTunnelAcl permit ip host any
access-list inside_outbound_nat0_acl permit ip host
access-list outside_cryptomap_dyn_100 permit ip any
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside 38.96.xx.xx
ip address inside
ip audit info action alarm
ip audit attack action alarm
ip local pool MYVPN
pdm location 24.45.xx.xx outside
pdm location 63.127.xx.xx outside
pdm location inside
pdm location inside
pdm location outside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_outbound_nat0_acl
nat (inside) 1 0 0
static (inside,outside) tcp interface smtp smtp netmask 0 0
static (inside,outside) tcp interface www www netmask 0 0
static (inside,outside) tcp interface https https netmask 0 0
static (inside,outside) tcp interface 3389 3389 netmask 0 0
access-group 100 in interface outside
route outside 38.96.xx.xx 1
timeout xlate 0:05:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 1:00:00
timeout h323 0:05:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
timeout sip-disconnect 0:02:00 sip-invite 0:03:00
timeout uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server TACACS+ max-failed-attempts 3
aaa-server TACACS+ deadtime 10
aaa-server RADIUS protocol radius
aaa-server RADIUS max-failed-attempts 3
aaa-server RADIUS deadtime 10
aaa-server LOCAL protocol local
http server enable
http inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac
crypto dynamic-map outside_dyn_map 20 set transform-set ESP-3DES-MD5
crypto dynamic-map outside_dyn_map 40 set transform-set ESP-3DES-MD5
crypto dynamic-map outside_dyn_map 60 set transform-set ESP-3DES-MD5
crypto dynamic-map outside_dyn_map 80 set transform-set ESP-3DES-MD5
crypto dynamic-map outside_dyn_map 100 match address outside_cryptomap_dyn_100
crypto dynamic-map outside_dyn_map 100 set transform-set ESP-3DES-MD5
crypto map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map
crypto map outside_map interface outside
isakmp nat-traversal 20
isakmp enable outside
isakmp policy 20 authentication pre-share
isakmp policy 20 encryption 3des
isakmp policy 20 hash md5
isakmp policy 20 group 2
isakmp policy 20 lifetime 86400
vpngroup VPN idle-time 1800
vpngroup MYVPM idle-time 1800
vpngroup MYVPN address-pool MYVPN
vpngroup MYVPN dns-server
vpngroup MYVPN wins-server
vpngroup MYVPN default-domain jam.local
vpngroup MYVPN split-tunnel MYVPN_splitTunnelAcl
vpngroup MYVPN idle-time 1800
vpngroup MYVPN password ********
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address inside
dhcpd dns
dhcpd wins
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd auto_config outside
dhcpd enable inside
terminal width 80
: end
Question by:Eros18
  • 6
  • 5
LVL 22

Expert Comment

by:Rick Hobbs
ID: 22764879
MYVPN is your vpn pool of addresses,  It is required. It appears the vpn you are trying to configure is JAMVPN,  None of the supporting commands for it are there,   I would recommend you go to the VPN tab and remove everything and start the wizard over.

Author Comment

ID: 22768851
JAMVPN = MYVPN. I renamed to hide private information. Looks like I missed one. Any other ideas?

Author Comment

ID: 22768908
Just to clarify, the VPN connection works. However if I connect from 2 PC's behind the SAME router only one connection works.
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Author Comment

ID: 23231494
Any ideas? I have reviewed this config and tested many times. I am still unable to connect from 2 or more systems from the same IP address.
LVL 22

Expert Comment

by:Rick Hobbs
ID: 23241012
What is the VPM license on this firewall?  How many connections?

Author Comment

ID: 23242599
PIX 506e with 25 vpn licenses. No hardware based vpn connections at this time and only using Cisco VPN Client to connect.
LVL 22

Expert Comment

by:Rick Hobbs
ID: 23244226
I see a couple things.  First of all it is not good that your vpn tunnel is the same network as your internal network.  I would use 20 internal and 21 for the VPN and add a route for it..   Secondly, there seems to be  problems with the crypto mapping.  You must get rid of the JAMVPN.  If you have, can you post an updated config?  Is the closck set on the PIX?  If yes, set the timezone and DST.
clock timezone EST -5
clock summer-time EDT recurring
LVL 22

Expert Comment

by:Rick Hobbs
ID: 23244233
Also, can you open a log window on the second VPN client trying to connect and post the output?
LVL 22

Accepted Solution

Rick Hobbs earned 2000 total points
ID: 23244245

Author Comment

ID: 24942223
The issue turned out to be the Transparent Tunneling option in the VPN 5.0 client. Apparently on one system it was turned on causing a conflict with the Transparent Tunneling config on the PIX. Disabled it and tested again, works great. rickhobbs I assign you the points for following up on this post. Thanks!
LVL 22

Expert Comment

by:Rick Hobbs
ID: 24961087
For future reference, if you go under c:\Program Files\Cisco Systems\VPN Client\Profiles and copy the .prf file desired after you have installed the client on an other machines, you won't have to worry about getting something wrong in the configuration.

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