Server stops to connect to Internet -PIX 516

[nilsf]

Hi Guis,

I'm having a problem with one of my server. Sometimes I can not connect to the Internet from the server, all others machines can browser the Internet withuot any problem.
I'm only running Exchange 5.5 on the server.
The only way to get the server to browser the Internet again is restart a DSL router(RC network), which is connect to my PIX 515.
I thought that the problem was on the router, which is propety of my Internet provider, but nothing changes after it has been replaced.
I think the problem maybe on my PIX, which is doing NAT. I've update the OS to version 6.2, but again nothing is change.

 

[Guest_imported]

Please post your Pix config.

 

[nilsf]

Hi Puta,

Tanks for you help!

ion 6.2(2)
nameif ethernet0 outside security0
nameif ethernet1 inside security100
nameif ethernet2 dmz security50
enable password Vp1JhKeFW8Hyr8D3 encrypted
passwd Vp1JhKeFW8Hyr8D3 encrypted
hostname *********
domain-name **********
fixup protocol ftp 21
fixup protocol http 80
fixup protocol h323 h225 1720
fixup protocol h323 ras 1718-1719
fixup protocol ils 389
fixup protocol rsh 514
fixup protocol rtsp 554
fixup protocol sqlnet 1521
fixup protocol sip 5060
fixup protocol skinny 2000
no fixup protocol smtp 25
no names
access-list nonat permit ip 10.137.0.0 255.255.255.0 10.137.8.0 255.255.255.0
pager lines 24
logging on
logging buffered notifications
logging facility 6
interface ethernet0 10baset
interface ethernet1 10baset
interface ethernet2 auto
mtu outside 1500
mtu inside 1500
mtu dmz 1500
ip address outside ***.***.*** ***.***.***
ip address inside 10.137.0.1 255.255.248.0
ip address dmz 192.168.0.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
ip local pool vpn 10.137.8.1-10.137.8.200
no failover
failover timeout 0:00:00
failover poll 15
failover ip address outside 0.0.0.0
failover ip address inside 0.0.0.0
failover ip address dmz 0.0.0.0
pdm location ***.***.*** 255.255.255.255 inside
pdm history enable
arp timeout 14400
global (outside) 1 interface
global (dmz) 1 192.168.0.10-192.168.0.254
nat (inside) 0 access-list nonat
nat (inside) 1 0.0.0.0 0.0.0.0 0 0
nat (dmz) 1 192.168.0.0 255.255.255.0 0 0
static (inside,outside) ***.***.*** 10.137.0.2 netmask 255.255.255.255 0 0
static (inside,outside) ***.***.*** 10.137.0.5 netmask 255.255.255.255 0 0
static (inside,outside) ***.***.*** 10.137.0.8 netmask 255.255.255.255 0 0
static (dmz,outside) ***.***.*** 192.168.0.6 netmask 255.255.255.255 0 0
static (inside,dmz) 192.168.0.10 10.137.0.7 netmask 255.255.255.255 0 0
conduit permit icmp any any
conduit permit tcp host ***.***.*** eq

http://www any

route outside 0.0.0.0 0.0.0.0 ***.***.*** 1
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h323 0:05:00 si
p 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
aaa-server AuthInbound protocol radius
aaa-server AuthInbound (inside) host 10.137.0.2 ** timeout 5
http server enable
http ***.***.*** 255.255.255.255 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
sysopt connection permit-ipsec
no sysopt route dnat
crypto ipsec transform-set myset esp-des esp-md5-hmac
crypto dynamic-map dynmap 10 set transform-set myset
crypto map mymap 10 ipsec-isakmp dynamic dynmap
crypto map mymap client configuration address initiate
crypto map mymap client configuration address respond
crypto map mymap interface outside
isakmp enable outside
isakmp key ******** address 0.0.0.0 netmask 0.0.0.0
isakmp identity address
isakmp client configuration address-pool local vpn outside
isakmp policy 10 authentication pre-share
isakmp policy 10 encryption des
isakmp policy 10 hash md5
isakmp policy 10 group 2
isakmp policy 10 lifetime 86400
vpngroup vpn3000 address-pool vpn
vpngroup vpn3000 dns-server 10.137.0.4
vpngroup vpn3000 wins-server 10.137.0.4
vpngroup vpn3000 default-domain ***.***.***
vpngroup vpn3000 idle-time 1800
vpngroup vpn3000 password ***.***.***
telnet 10.0.0.0 255.0.0.0 inside
telnet timeout 5
ssh ***.***.*** 255.255.255.0 inside
ssh timeout 60
vpdn group 1 accept dialin pptp
vpdn group 1 ppp authentication pap
vpdn group 1 ppp authentication chap
vpdn group 1 ppp authentication mschap
vpdn group 1 ppp encryption mppe 40
vpdn group 1 client configuration address local vpn
vpdn group 1 client configuration dns 10.137.0.4
vpdn group 1 client authentication aaa AuthInbound
vpdn group 1 pptp echo 60
vpdn enable outside
terminal width 80
Cryptochecksum:73a7c89

 

[yizhar]

HI.

The problems you have mentioned are normaly related to the router and ISP rather to the pix.

Ask your ISP for the router config.

Try to set a low MTU on the server, and/or to enable the ip tcp-adjust (I don't remember the exact IOS command) on the router that reassembles packets using proper MTU for delivery.

Is the router doing NAT also?

When you have the problem, can the server create a telnet session via the pix to a known ip address, for example the perimeter router?

Do you get any syslog error messages at the pix (You should first enable syslog in some way)?

Bye
Yizhar Hurwitz

http://come.to/yizhar

http://teachers.sivan.co.il/yizhar

 

[nilsf]

Hi Yizhar,

Thanks for you help,

No, the router is not doing NAT. I'l try the tcp-adjust.

Nils