Connectivity issue on VPN Tunnel

I have a Cisco PIX 506E establishing a VPN tunnel with a CheckPoint Device.

But the preblem is Phase I and II are up but when an echo request is sent from behind the CheckPoint device I can see the request hitting the PIX but no reply is being sent back to the CheckPoint.

Regards

Did you configure your no-nat ?

yes i did and applied it.

i even installed a sniffer on the destination machine and i can see the requests and still from the machine no reply is generated. but when i ping the machine outside the tunnel i get replies.

Regards

could you post your config please ?

PIX Config

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access-list aclin permit tcp any any eq ftp
access-list aclin permit tcp any any eq telnet
access-list aclin permit tcp any any eq ssh
access-list aclin permit tcp any any eq 69
access-list aclin permit tcp any any eq 2775
access-list aclin permit tcp host EX_host_IP any
access-list aclin permit icmp host EX_host_IP host 192.168.1.51
access-list aclin permit udp any any
access-list aclin permit icmp any any
access-list aclout permit tcp any any eq telnet
access-list aclout permit tcp any any eq ftp
access-list aclout permit tcp any any eq 69
access-list aclout permit tcp any any eq https
access-list aclout permit tcp any any eq www
access-list aclout permit tcp any any eq 2775
access-list aclout permit tcp any host EX_host_IP
access-list aclout permit icmp host 192.168.1.51 host EX_host_IP
access-list aclout permit udp any any
access-list aclout permit icmp any any
access-list nonat permit ip host 192.168.1.51 EX_host_Network
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside x.x.x.x 255.255.255.240
ip address inside 192.168.1.53 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 0 access-list nonat
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
access-group aclin in interface outside
access-group aclout in interface inside
route outside 0.0.0.0 0.0.0.0 x.x.x.x 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
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 Magic esp-3des esp-md5-hmac
crypto ipsec security-association lifetime seconds 3600
crypto map Africell-Splash-VPN 10 ipsec-isakmp
crypto map Africell-Splash-VPN 10 match address lash
crypto map Africell-Splash-VPN 10 set peer EX_CHECKPOINT_IP
crypto map Africell-Splash-VPN 10 set transform-set MoreMagic
crypto map Africell-Splash-VPN interface outside
isakmp enable outside
isakmp key ******** address EX_CHECKPOINT_IP netmask 255.255.255.255
isakmp identity address
isakmp nat-traversal 60
isakmp policy 30 authentication pre-share
isakmp policy 30 encryption 3des
isakmp policy 30 hash md5
isakmp policy 30 group 2
isakmp policy 30 lifetime 86400
telnet 192.168.1.0 255.255.255.0 inside
telnet timeout 30

Phase I

---

Africell-VPN-Splash# sh isakmp sa
Total : 1
Embryonic : 0
dst src state pending created
X.X.X.X EX_CHECKPOINT_IP QM_IDLE 0 1

---

Phase II

---

local ident (addr/mask/prot/port): (192.168.1.51/255.255.255.255/0/0)
remote ident (addr/mask/prot/port): (X.X.X.X/255.255.255.255/0/0)
current_peer: EX_CHECKPOINT_IP:500
PERMIT, flags={origin_is_acl,}
#pkts encaps: 0, #pkts encrypt: 0, #pkts digest 0
#pkts decaps: 3365, #pkts decrypt: 3365, #pkts verify 3365
#pkts compressed: 0, #pkts decompressed: 0
#pkts not compressed: 0, #pkts compr. failed: 0, #pkts decompress failed: 0
#send errors 0, #recv errors 0

local crypto endpt.: X.X.X.X, remote crypto endpt.: EX_CHECKPOINT_IP
path mtu 1500, ipsec overhead 56, media mtu 1500
current outbound spi: 5d825efa

inbound esp sas:
spi: 0x6d8479b9(1837398457)
transform: esp-3des esp-md5-hmac ,
in use settings ={Tunnel, }
slot: 0, conn id: 1, crypto map: Africell-Splash-VPN
sa timing: remaining key lifetime (k/sec): (4607618/155)
IV size: 8 bytes
replay detection support: Y


inbound ah sas:


inbound pcp sas:


outbound esp sas:
spi: 0x5d825efa(1568825082)
transform: esp-3des esp-md5-hmac ,
in use settings ={Tunnel, }
slot: 0, conn id: 2, crypto map: Africell-Splash-VPN
sa timing: remaining key lifetime (k/sec): (4608000/159)
IV size: 8 bytes
replay detection support: Y


outbound ah sas:


outbound pcp sas: