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PI X PPTP stopped working
From: Paolo Supino <paolo () actcom net il>
Date: Mon, 24 Jul 2006 20:28:18 -0400

Hi

  A very strange thing happened to me today: A PIX firewall I have, 
stopped accepting PPTP connections. The only thing that happened before 
it stopped responding to PPTP connection was that I ran nmap scanner on 
the subnet this PIX is on (to try and find out whether someone decided 
to start another computer on it. Apart from this nothing has changed on 
this subnet for a while including the PIX' configuration. Trying to 
telnet to port 1723 gives the error: "Could not open a connection to 
host on port 1723 : Connection failed". Any help solving this problem 
will greatly appreciated.


the PIX configuration is (IP addresses, names and password hashes 
changed to protect the innocent):

: Written by enable_15 at 12:06:45.250 EDT Fri Jun 29 2006
PIX Version 6.3(1)
interface ethernet0 auto
interface ethernet1 auto
interface ethernet2 auto
nameif ethernet0 outside security0
nameif ethernet1 inside security100
nameif ethernet2 dmz security50
enable password 1234567890 encrypted
passwd 0987654321 encrypted
hostname fw1
domain-name supernova.com
clock timezone PST -8
clock summer-time PDT recurring
fixup protocol ftp 21
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol http 80
fixup protocol ils 389
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sip 5060
fixup protocol sip udp 5060
fixup protocol sip udp 5060
fixup protocol skinny 2000
fixup protocol smtp 25
fixup protocol sqlnet 1521
names
name 10.29.22.10 JANEPC
name 10.143.103.249 JOHNPC
name 10.40.133.0 JACKSNET
object-group service SRVCGRP1 tcp
  port-object eq ftp-data
  port-object eq ftp
  port-object eq www
  port-object eq 990
  port-object eq https
  port-object range 23054 23154
object-group service SRVCGRP2 tcp
  port-object eq 28
  port-object eq 27
  port-object eq ftp-data
  port-object eq ftp
  port-object eq www
  port-object eq https
object-group service SRVCGRP3 tcp
  port-object eq ftp
  port-object eq ftp-data
  port-object eq https
  port-object eq www
access-list OUTIN permit tcp any host 192.165.164.7 object-group SRVCGRP1
access-list OUTIN permit tcp any host 192.165.164.5 object-group SRVCGRP2
access-list OUTIN permit icmp any any
access-list OUTIN permit tcp any host 192.165.164.8 object-group SRVCGRP3
access-list INOUTNAT0ACL permit ip 172.16.25.0 255.255.255.0 172.16.27.0 
255.255.255.224
access-list INOUTNAT0ACL permit ip 172.16.25.0 255.255.255.0 172.16.25.0 
255.255.255.192
access-list DMZOUTNAT0ACL permit ip 172.16.26.0 255.255.255.0 
172.16.25.0 255.255.255.192
access-list DMZOUTNAT0ACL permit ip 172.16.26.0 255.255.255.0 
172.16.27.0 255.255.255.224
access-list VPN0SPLITTUNNELACL permit ip 172.16.25.0 255.255.255.0 any
access-list VPN0SPLITTUNNELACL permit ip 172.16.26.0 255.255.255.0 any
pager lines 24
logging on
logging trap informational
icmp permit any outside
icmp permit any inside
mtu outside 1500
mtu inside 1500
mtu dmz 1500
ip address outside 192.165.164.14 255.255.255.240
ip address inside 172.16.25.1 255.255.255.0
ip address dmz 172.16.26.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool VPNIPPOOL 172.16.27.5-172.16.27.25
ip local pool x 172.16.99.1-172.16.99.2
pdm location 172.16.25.0 255.255.255.0 inside
pdm logging debugging 300
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list INOUTNAT0ACL
nat (inside) 1 172.16.25.0 255.255.255.0 dns 0 0
nat (dmz) 0 access-list dmz_outbound_nat0_acl
static (inside,outside) 192.165.164.4 172.16.25.4 dns netmask 
255.255.255.255 0 0
static (inside,outside) 192.165.164.5 172.16.25.5 dns netmask 
255.255.255.255 0 0
static (inside,outside) 192.165.164.6 172.16.25.6 dns netmask 
255.255.255.255 0 0
static (inside,outside) 192.165.164.7 172.16.25.7 dns netmask 
255.255.255.255 0 0
static (inside,outside) 192.165.164.10 172.16.25.27 netmask 
255.255.255.255 0 0
static (inside,outside) 192.165.164.11 172.16.25.28 netmask 
255.255.255.255 0 0
static (inside,outside) 192.165.164.8 172.16.25.8 netmask 
255.255.255.255 0 0
access-group OUTINACCESS in interface outside
route outside 0.0.0.0 0.0.0.0 192.165.164.1 1
timeout xlate 3:00:00
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 uauth 0:05:00 absolute
aaa-server TACACS+ protocol tacacs+
aaa-server RADIUS protocol radius
aaa-server LOCAL protocol local
http server enable
http 172.16.25.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
sysopt connection permit-pptp
sysopt connection permit-l2tp
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 map outside_map 65535 ipsec-isakmp dynamic outside_dyn_map
crypto map outside_map interface outside
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 VPN0 dns-server 172.16.25.7 192.165.160.179
vpngroup VPN0 default-domain supernova.com
vpngroup VPN0 split-tunnel VPN0SPLITTUNNELACL
vpngroup VPN0 idle-time 1800
vpngroup VPN0 password ********
telnet 172.16.25.0 255.255.255.0 inside
telnet timeout 5
ssh 172.16.25.0 255.255.255.0 inside
ssh timeout 5
console timeout 0
vpdn group VPN1 accept dialin pptp
vpdn group VPN1 ppp authentication pap
vpdn group VPN1 ppp authentication chap
vpdn group VPN1 ppp authentication mschap
vpdn group VPN1 ppp encryption mppe auto
vpdn group VPN1 client configuration address local VPNIPPOOL
vpdn group VPN1 client configuration dns 192.165.160.180 192.168.100.47
vpdn group VPN1 pptp echo 300
vpdn group VPN1 client authentication local
vpdn username user1 password ********
vpdn username user2 password ********
vpdn username user3 password ********
vpdn username user4 password ********
vpdn enable outside
username administrator password 0123456789 encrypted privilege 15
terminal width 80
Cryptochecksum: 00000000000000000000000000000000




TIA
Paolo


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