Question

Port 143 being blocked by ASA-5505

Asked by: breynolds01

I cant seem to get imap to forward through an ASA-5505, I keep getting the following error recorded in the log:

"Deny tcp src outside:208.64.252.230/59728 dst inside:76.164.123.123/143 by access-group "ACL_OUT" [0x0, 0x0]"

here is the running config:

: Saved
:
ASA Version 7.2(2)
!
hostname organic-asa
domain-name domain.com
enable password QVreAjmZpZMBqeE5 encrypted
names
!
interface Vlan1
 nameif inside
 security-level 100
 ip address 192.168.1.1 255.255.255.0
!
interface Vlan2
 nameif outside
 security-level 0
 ip address 76.164.123.123 255.255.255.0
!
interface Ethernet0/0
 switchport access vlan 2
!
interface Ethernet0/1
!
interface Ethernet0/2
!
interface Ethernet0/3
!
interface Ethernet0/4
!
interface Ethernet0/5
!
interface Ethernet0/6
!
interface Ethernet0/7
!
passwd Up01ckO5qoo5pbet encrypted
banner login This is a private network.
banner login Only authorized access is allowed.
banner login If you are not authorized, exit immediately.
banner login Violators will be Prosecuted.
banner login ============================================
banner login
ftp mode passive
clock timezone PDT -8
clock summer-time PDT recurring 1 Sun Apr 2:00 last Sun Oct 2:00
dns server-group DefaultDNS
 domain-name domain.com
object-group network group1
 network-object host 173.43.45.34
access-list ACL_OUT extended permit tcp any interface outside eq smtp
access-list ACL_OUT extended permit tcp any interface outside eq www
access-list ACL_OUT extended permit tcp any interface outside eq https
access-list ACL_OUT extended permit tcp any interface outside eq 4125
access-list ACL_OUT extended permit tcp object-group group1 interface outside eq 3389
access-list ACL_OUT extended permit tcp any host 76.164.123.123 eq https
access-list ACL_OUT extended permit tcp any interface outside eq pop3
access-list ACL_OUT extended permit tcp any eq imap4 interface outside eq imap4
pager lines 24
logging enable
logging asdm informational
mtu inside 1500
mtu outside 1500
icmp unreachable rate-limit 1 burst-size 1
asdm image disk0:/asdm-522.bin
no asdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 192.168.1.0 255.255.255.0
static (inside,outside) tcp interface smtp 192.168.1.2 smtp netmask 255.255.255.255
static (inside,outside) tcp interface www 192.168.1.2 www netmask 255.255.255.255
static (inside,outside) tcp interface https 192.168.1.2 https netmask 255.255.255.255
static (inside,outside) tcp interface 3389 192.168.1.2 3389 netmask 255.255.255.255
static (inside,outside) tcp interface 4125 192.168.1.2 4125 netmask 255.255.255.255
static (inside,outside) tcp interface pop3 192.168.1.2 pop3 netmask 255.255.255.255
static (inside,outside) tcp interface imap4 192.168.1.2 imap4 netmask 255.255.255.255
static (inside,outside) 76.164.123.123 192.168.1.3 netmask 255.255.255.255
access-group ACL_OUT in interface outside
route outside 0.0.0.0 0.0.0.0 76.164.23.1 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
http server enable 334
http 69.30.123.123 255.255.255.224 outside
http 192.168.1.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server enable traps snmp authentication linkup linkdown coldstart
telnet 192.168.1.0 255.255.255.0 inside
telnet timeout 5
ssh 69.30.123.123 255.255.255.224 outside
ssh timeout 5
console timeout 5
management-access inside

!
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 rsh
  inspect rtsp
  inspect sqlnet
  inspect skinny
  inspect sunrpc
  inspect xdmcp
  inspect sip
  inspect netbios
  inspect tftp
!
service-policy global_policy global
ntp server 192.168.1.2 source inside prefer
prompt hostname context
Cryptochecksum:10c004e2eafd2a292cbbbc3c967c9ea3
: end

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Asked On
2009-10-12 at 08:32:04ID24804816
Tags

ASA-5505

,

cisco

Topics

Network Routers

,

Networking Hardware Firewalls

,

Cisco PIX Firewall

Participating Experts
3
Points
500
Comments
7

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Answers

 

by: PeteLongPosted on 2009-10-12 at 08:35:22ID: 25552119

Im guessing that RPC on the server is the problem rather than IMAP - it replies on random ports that will be blocked by the ASA - what are you trying to connect to what?

is this an outlook client trying to talk to exchange?

 

by: JFrederick29Posted on 2009-10-12 at 08:37:02ID: 25552129

Your access-list entry is incorrect.  Should be:

access-list ACL_OUT extended permit tcp any interface outside eq imap4

 

by: breynolds01Posted on 2009-10-12 at 08:37:48ID: 25552134

I am trying to get mac mail to connect to exchange

 

by: kenboonejrPosted on 2009-10-12 at 08:38:44ID: 25552142

access-list ACL_OUT extended permit tcp any eq imap4 interface outside eq imap4

The problem is this.  In your ACL you are specify that the SOURCE and DESTINATION port is 143.  The destination port is correct, but you don't care what the source port is and that is why it is not matching your ACL.

You have this:
access-list ACL_OUT extended permit tcp any eq imap4 interface outside eq imap4

Do this instead:
access-list ACL_OUT extended permit tcp any interface outside eq imap4

 

by: breynolds01Posted on 2009-10-12 at 08:39:36ID: 25552154

JFrederick29: how would I make the necessary changed to accomplish that?

 

by: JFrederick29Posted on 2009-10-12 at 08:40:31ID: 25552161

Login to the ASA and apply the following commands:

conf t
access-list ACL_OUT extended permit tcp any interface outside eq imap4

Done.

 

by: breynolds01Posted on 2009-10-12 at 08:44:20ID: 25552198

sweet! that was it JFrederick29, thanks!

20120131-EE-VQP-002

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