Question

Unable to connect to a remote application thru PIX VPN connection

Asked by: piotrmikula108

I have two sites, both on PIX 506 and VPN configured. I also have a video camera software that needs to connect to the remote IP host so I can view the images thru VPN. Everything works fine when I'm not at my primary site behind that PIX. When I go somewhere  else, VPN connects fine, I launch the application, enter the IP (192.168.100.99) and am able to logon and all is OK. But when I'm behind the PIX in the office VPN connects fine but the application says it can't connect to the server, so since everything works fine outside the PIX office network there must be some misconfiguratin on the PIX. I have attached the sanitzed PIX config below

Please advise

PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password xxxxxxxxxxxxxxxx encrypted
passwd xxxxxxxxxx encrypted
hostname pixfirewallfci
domain-name xxxxx.local
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
fixup protocol smtp 25
fixup protocol sqlnet 1521
fixup protocol tftp 69
names
access-list inside_outbound_nat0_acl permit ip any 10.1.10.64 255.255.255.192 
access-list outside_cryptomap_dyn_20 permit ip any 10.1.10.64 255.255.255.192 
access-list outside_access_in permit tcp any host 173.8.xx.xxx eq www 
access-list outside_access_in permit tcp any host 173.8.xx.xxx eq https 
access-list outside_access_in permit tcp any host 173.8.xx.xxx eq smtp 
access-list outside_access_in permit tcp any host 173.8.xx.xxx eq 3125 
access-list outside_access_in permit icmp any any echo 
access-list outside_access_in permit icmp any any echo-reply 
access-list FatsVPN_splitTunnelAcl permit ip 10.1.10.0 255.255.255.0 any 
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside 173.8.xx.xxx 255.255.255.248
ip address inside 10.1.10.254 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool FatsVPNPool 10.1.10.90-10.1.10.99
pdm location 10.1.10.5 255.255.255.255 inside
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list inside_outbound_nat0_acl
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
static (inside,outside) 173.8.xx.xxx 10.1.10.5 netmask 255.255.255.255 0 0 
access-group outside_access_in in interface outside
route outside 0.0.0.0 0.0.0.0 173.8.xx.xxx 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 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 10.1.10.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac 
crypto dynamic-map outside_dyn_map 20 match address outside_cryptomap_dyn_20
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
crypto map inside_map interface inside
isakmp enable outside
isakmp nat-traversal 20
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 xxxxVPN address-pool xxxxVPNPool
vpngroup xxxxVPN dns-server 10.1.10.5
vpngroup FatsVPN default-domain xxxx.Local
vpngroup FatsVPN split-tunnel xxxVPN_splitTunnelAcl
vpngroup FatsVPN idle-time 1800
vpngroup FatsVPN password xxxxxx
telnet timeout 5
ssh timeout 5
console timeout 0
terminal width 80
Cryptochecksum:70e485cd4148c50ba03d0a52b5ee0345

                                  
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Asked On
2009-10-06 at 11:21:21ID24789916
Topics

Cisco PIX Firewall

,

Virtual Private Networking (VPN)

,

Network Routers

Participating Experts
2
Points
0
Comments
14

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Answers

 

by: MikeKanePosted on 2009-10-06 at 11:48:01ID: 25508386

What protocol or port are you connecting to on the outside from inside this pix?  

Also, what ip are you connecting to... if its public, just give me the 1st octet.

 

by: piotrmikula108Posted on 2009-10-06 at 12:23:15ID: 25508798

the Video Camera server is listening on 80, 4050, 5550, and 55502

the public IP of the destination PIX where the VideoCamera server is behind of is 67.203.xxx.xxx

 

by: piotrmikula108Posted on 2009-10-12 at 12:48:55ID: 25554365

the strange thing is that we have the same problem on other networks when connected from behind a PIX firewall, other routers like SonicWall or home Linksys don't interfere with the app

Any ideas what's up with the PIX


Thank you

 

by: MikeKanePosted on 2009-10-12 at 13:07:08ID: 25554508

I would setup a syslog server and the PIX to strem out syslog data.   If the PIX is dropping the packets for any reason, the syslog will have a record of it.  

Here's the cisco how to on the syslog, its very easy to setup.
http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a00805a2e04.shtml

There are plenty of free syslog servers.... try kiwi  http://www.kiwisyslog.com/kiwi-syslog-server-download/

The pix may either be dropping this from an ACL or even from one of the fixups.     The syslog should help.  

As a test, you can also remove the fixups from the pix config during troubleshooting to see if that's the cause.

 

by: piotrmikula108Posted on 2009-10-12 at 20:06:00ID: 25556690

thank you for all your help, I configured the syslog and it pointed me to the problem with protocol 50 being blocked so I also searched EE and found this post http://www.experts-exchange.com/Security/Software_Firewalls/Q_20995655.html where they advised to try this

access-list 101 permit esp any interface outside
access-group 101 in interface outside

That did the trick

Thank you!!!

 

by: MikeKanePosted on 2009-10-13 at 05:12:31ID: 25559072

Great. Glad its working

 

by: piotrmikula108Posted on 2009-10-13 at 13:49:35ID: 25564430

One more follow up questions,

I forgot to say it also needs fixup protocol esp-ike

I tested it at home with no VPN configured on the PIX. One of the sites however has VPN configured and I can't enable fixup prtoocol esp-ike because one f the interfaces has IKE enabled, once I disabled it temporarrily it works. Is there a work around it?

Thank you

 

by: MikeKanePosted on 2009-10-13 at 14:18:11ID: 25564845

I didn't quite follow that....   What change did you make to get ESP passing inbound?  

 

by: piotrmikula108Posted on 2009-10-13 at 15:54:08ID: 25565662

sorry for that

added: access-list outside_access_in permit esp any interface outside

and tried adding

fixup protocol esp-ike

but it wouldn't let me as there is VPN configured on this PIX and PDM said that I need to disabled IKE on the outside interface, so I went to Configuration -> VPN -> IKE -> Policies and disabled IKE for the outside interface, but that breaks our site to site VPN but allows to to connect to the remote app

so I wonder what is the way around this to have fixup protocol esp-ike  turned on and IKE enabled on outside interface

full config attached

Thank you

PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password xxxxxxxxxxxx encrypted
passwd xxxxxxxxxx encrypted
hostname xxxxxxxxxxxxxx
domain-name ciscopix.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
names
name 172.1.1.0 xxxxxxxxxxx
access-list inside_access_in permit icmp any any 
access-list inside_access_in permit ip any any 
access-list inside_access_in permit ip 172.1.2.0 255.255.255.0 xxxxxxxx 255.255.255.0 
access-list outside_access_in permit icmp any any 
access-list outside_access_in permit tcp any host 99.35.105.251 eq smtp 
access-list outside_access_in permit tcp any host 99.35.105.251 eq www 
access-list outside_access_in permit tcp any host 99.35.105.251 eq https 
access-list outside_access_in permit tcp any host 99.35.105.251 eq 4125 
access-list outside_access_in permit tcp any host 99.35.105.251 eq ftp 
access-list outside_access_in permit esp any interface outside 
access-list inside_outbound_nat0_acl permit ip 172.1.2.0 255.255.255.0 xxxxxxx 255.255.255.0 
access-list outside_cryptomap_20 permit ip 172.1.2.0 255.255.255.0 xxxxxxx 255.255.255.0 
pager lines 24
logging on
logging trap informational
logging host inside 172.1.2.86
mtu outside 1500
mtu inside 1500
ip address outside 99.35.xxx.xxx 255.255.255.248
ip address inside 172.1.2.254 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm location 172.1.2.5 255.255.255.255 inside
pdm location xxxxx 255.255.255.0 outside
pdm location 0.0.0.0 255.255.255.248 outside
pdm location 172.1.2.86 255.255.255.255 inside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 10 interface
nat (inside) 0 access-list inside_outbound_nat0_acl
nat (inside) 10 0.0.0.0 0.0.0.0 0 0
static (inside,outside) 99.35.xxxx.xxx 172.1.2.5 netmask 255.255.255.255 0 0 
access-group outside_access_in in interface outside
access-group inside_access_in in interface inside
route outside 0.0.0.0 0.0.0.0 99.35.xxx.xxx 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 0.0.0.0 0.0.0.0 inside
no snmp-server location
no snmp-server contact
snmp-server community xxxxx
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
crypto ipsec transform-set ESP-3DES-MD5 esp-3des esp-md5-hmac 
crypto map outside_map 20 ipsec-isakmp
crypto map outside_map 20 match address outside_cryptomap_20
crypto map outside_map 20 set peer 99.174.xxx.xxx
crypto map outside_map 20 set transform-set ESP-3DES-MD5
crypto map outside_map interface outside
isakmp enable outside
isakmp key ******** address 99.174.xxx.xxx netmask 255.255.255.255 
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
telnet timeout 5
ssh timeout 5
console timeout 0
dhcpd address 172.1.2.76-172.1.2.100 inside
dhcpd dns 69.19.xxx.xxx 69.19.xxx.xxx
dhcpd lease 3600
dhcpd ping_timeout 750
dhcpd domain xxxxx.Local
dhcpd auto_config outside
terminal width 80
Cryptochecksum:xxxxxxxxxx
                                              
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by: piotrmikula108Posted on 2009-10-14 at 11:24:19ID: 25573463

Hello Mike

Do you have any idea how to work around this issue? I'm stuck

Thank you

 

by: morrisminorPosted on 2009-10-15 at 13:26:38ID: 25584522

The third line here is not needed and is never used becaus line 2 is there...

access-list inside_access_in permit icmp any any
access-list inside_access_in permit ip any any
access-list inside_access_in permit ip 172.1.2.0 255.255.255.0 xxxxxxxx 255.255.255.0

Just remove it by using.....
no access-list inside_access_in permit ip 172.1.2.0 255.255.255.0 xxxxxxxx 255.255.255.0

Also see your other thread.  

 

by: morrisminorPosted on 2009-10-15 at 14:00:24ID: 25584856

This URL will help you if its LAN to LAN VPN you are trying to use.  

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a0080093bd3.shtml

This URL on the other hand will help you if its remote access VPN Client software you are using.  

http://www.cisco.com/en/US/tech/tk583/tk372/technologies_configuration_example09186a008009442e.shtml

 

by: piotrmikula108Posted on 2009-10-22 at 21:52:04ID: 25641435

Hello

Sorry for not responding promptly, it's been a crazy time for me at work, I will try to post it in few days

 

by: piotrmikula108Posted on 2010-01-01 at 18:04:51ID: 26159927

I had to give up on trying to fix the issue but thank you everyone for trying to help, we replaced PIX with SonicWall and it works

Thanks again

20120131-EE-VQP-002

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