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Cisco ASA PPTP VPN Problem

Posted on 2010-09-04
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Last Modified: 2012-05-10
Hello boys and girls, hopefully someone will spot a blatent error in my config and help me out here. Basically, I've just installed an ASA for a client who's remote workers connect to a Windows Server 2003 PPTP VPN inorder to do their remote work and it doesn't work! I've exhausted myself trying to debug the code. I know you are all going to shout "switch to SSL VPN" at me but this is not an option at the moment due to the number of VPN users I need to re-train on how to use this service in the short term however, this will be rolled out in the long term.

Although I have PPTP (tcp/1723) permitted on the ASA as well as GRE (protocol 47) enabled in both directions with PPTP beng NAT-ed to the WIndows server the ASA still refuses the connection with th error "Deny inbound protocol 47 src outside:<CONNECTING IP> dst outside:SBS-EXCH-outside" in the syslog.

I've included a copy of the config with some bits hashed out. Please can someone help and save me an embarrasing situation on Monday morning!  Cheers.
ASA Version 8.0(3)
!
hostname asa1
domain-name domain.local
enable password ####### encrypted
names
name 62.49.74.99 ASA-outside
name 192.168.0.3 CTX-inside
name 62.49.74.100 CTX-outside
name 192.168.0.7 EXCH-inside
name 62.49.74.98 SBS-EXCH-outside
name 192.168.0.2 SBS-inside
name 192.168.55.1 WWW-inside
name 62.49.74.101 WWW-outside
!
interface Vlan1
 nameif inside
 security-level 100
 ip address 192.168.0.254 255.255.255.0
!
interface Vlan2
 nameif outside
 security-level 0
 ip address ASA-outside 255.255.255.248
!
interface Vlan12
 nameif dmz
 security-level 50
 ip address 192.168.55.254 255.255.255.0
!
interface Ethernet0/0
 switchport access vlan 2
!
interface Ethernet0/1
 switchport access vlan 12
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
!
interface Ethernet0/6
!
interface Ethernet0/7
!
passwd ####### encrypted
boot system disk0:/asa803-k8.bin
ftp mode passive
dns server-group DefaultDNS
 domain-name videconplc.local
object-group service DM_INLINE_SERVICE_2
 service-object tcp eq www
 service-object tcp eq https
 service-object tcp eq smtp
 service-object udp eq domain
object-group service DM_INLINE_TCP_2 tcp
 port-object eq www
 port-object eq https
object-group protocol DM_INLINE_PROTOCOL_1
 protocol-object ip
 protocol-object icmp
 protocol-object udp
 protocol-object gre
 protocol-object esp
object-group service SBS-EXCH-services tcp
 port-object eq 26675
 port-object eq 465
 port-object eq 5678
 port-object eq 5679
 port-object eq 990
 port-object eq 993
 port-object eq 995
 port-object eq 999
 port-object eq www
 port-object eq https
 port-object eq pptp
 port-object eq smtp
object-group service CTX-services tcp
 port-object eq 2598
 port-object eq citrix-ica
 port-object eq https
object-group service WWW-services tcp
 port-object eq 8010
 port-object eq www
 port-object eq https
access-list dmz_access_in extended permit icmp any any
access-list dmz_access_in extended permit tcp host WWW-inside any object-group DM_INLINE_TCP_2
access-list dmz_access_in extended permit object-group DM_INLINE_SERVICE_2 host WWW-inside host SBS-inside
access-list dmz_access_in extended permit tcp any any eq 5721
access-list dmz_nat0_outbound extended permit ip 192.168.0.0 255.255.255.0 192.168.55.0 255.255.255.0
access-list dmz_nat0_outbound extended permit ip 192.168.55.0 255.255.255.0 192.168.0.0 255.255.255.0
access-list inside_nat0_outbound extended permit ip 192.168.0.0 255.255.255.0 192.168.55.0 255.255.255.0
access-list inside_nat0_outbound extended permit ip 192.168.55.0 255.255.255.0 192.168.0.0 255.255.255.0
access-list outside_access_in extended permit tcp any host WWW-outside object-group WWW-services
access-list outside_access_in extended permit tcp any host CTX-outside object-group CTX-services
access-list outside_access_in extended permit tcp any host SBS-EXCH-outside object-group SBS-EXCH-services
access-list outside_access_in extended permit gre any host SBS-EXCH-outside
access-list outside_access_in extended permit icmp any any
access-list inside_access_in extended permit tcp host EXCH-inside any eq smtp
access-list inside_access_in extended deny tcp 192.168.0.0 255.255.255.0 any eq smtp
access-list inside_access_in extended permit object-group DM_INLINE_PROTOCOL_1 any any
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
mtu dmz 1500
no failover
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-603.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_nat0_outbound
nat (inside) 1 0.0.0.0 0.0.0.0
nat (dmz) 0 access-list dmz_nat0_outbound
nat (dmz) 1 0.0.0.0 0.0.0.0
static (inside,outside) tcp SBS-EXCH-outside smtp EXCH-inside smtp netmask 255.255.255.255
static (inside,outside) tcp SBS-EXCH-outside pptp SBS-inside pptp netmask 255.255.255.255
static (inside,outside) tcp SBS-EXCH-outside https EXCH-inside https netmask 255.255.255.255
static (inside,outside) tcp SBS-EXCH-outside www EXCH-inside www netmask 255.255.255.255
static (inside,outside) tcp SBS-EXCH-outside 999 EXCH-inside 999 netmask 255.255.255.255
static (inside,outside) tcp SBS-EXCH-outside 990 EXCH-inside 990 netmask 255.255.255.255
static (inside,outside) tcp SBS-EXCH-outside 5678 EXCH-inside 5678 netmask 255.255.255.255
static (inside,outside) tcp SBS-EXCH-outside 5679 EXCH-inside 5679 netmask 255.255.255.255
static (inside,outside) tcp SBS-EXCH-outside 26675 EXCH-inside 26675 netmask 255.255.255.255
static (dmz,outside) WWW-outside WWW-inside netmask 255.255.255.255
static (inside,outside) CTX-outside CTX-inside netmask 255.255.255.255
access-group inside_access_in in interface inside
access-group outside_access_in in interface outside
access-group dmz_access_in in interface dmz
route outside 0.0.0.0 0.0.0.0 62.49.74.97 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout uauth 0:05:00 absolute
dynamic-access-policy-record DfltAccessPolicy
http server enable
http 192.168.0.41 255.255.255.255 inside
http SBS-inside 255.255.255.255 inside
http 92.26.80.165 255.255.255.255 outside
http 92.26.80.166 255.255.255.255 outside
http 87.82.107.229 255.255.255.255 outside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
telnet timeout 5
ssh 192.168.0.41 255.255.255.255 inside
ssh SBS-inside 255.255.255.255 inside
ssh 87.82.107.229 255.255.255.255 outside
ssh 92.26.80.166 255.255.255.255 outside
ssh 92.26.80.165 255.255.255.255 outside
ssh timeout 5
console timeout 0

threat-detection basic-threat
threat-detection statistics access-list
!
class-map inspection_default
 match default-inspection-traffic
!
!
policy-map type inspect dns preset_dns_map
 parameters
  message-length maximum 512
policy-map global_policy
 class inspection_default
  inspect dns preset_dns_map
  inspect ftp
  inspect h323 h225
  inspect h323 ras
  inspect netbios
  inspect rsh
  inspect rtsp
  inspect skinny
  inspect esmtp
  inspect sqlnet
  inspect sunrpc
  inspect tftp
  inspect sip
  inspect xdmcp
!
service-policy global_policy global
prompt hostname context
Cryptochecksum:5baeb9fe615425134c523a973d0539a5
: end

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Question by:jimhoodleeds
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5 Comments
 
LVL 14

Expert Comment

by:anoopkmr
ID: 33604480
access-list outside_access_in extended permit tcp any host SBS-EXCH-outside object-group SBS-EXCH-services

there is no object group under this name, I think its a typo error.. just cross check ?
========================================================================
 
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LVL 14

Expert Comment

by:anoopkmr
ID: 33604493
please ignore my above comments .. sorry for the wrong information
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LVL 14

Expert Comment

by:anoopkmr
ID: 33604521
what I could see is u dont have nat translation rule for GRE.

 I don't think you can use port forwarding in your case because PPTP uses TCP/1721 and GRE PROTOCOL 47. port forwarding works for TCP or UDP

Your only option is one to one static NAT

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LVL 14

Expert Comment

by:anoopkmr
ID: 33604564
or u can have a try like below , i am not sure about the result

access-list permit-gre permit gre host 192.168.0.2 any
static(inside,outside) 62.49.74.98 access-list permit-gre
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LVL 2

Accepted Solution

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jimhoodleeds earned 0 total points
ID: 33606019
Thanks for the suggestion anoopkmr, however, it appears I have simply missed pptp out of the default inspection class. Added that in and works straight away. Cheers.
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