Please check pix config for incoming POP3 emails

fina27
fina27 used Ask the Experts™
on
A company I'm taking care of is having incoming e-mail issues. E-mails are timing out when people try to send to them. But the e-mail server is working fine with everyone else. I'm thinking it might be their pix. It has worked fine for awhile but i still think it might be an issue. Can someone please check my config? All they are using is POP3 for e-mails.

PIX Version 6.3(5)
interface ethernet0 auto
interface ethernet1 100full
nameif ethernet0 outside security0
nameif ethernet1 inside security100
enable password  encrypted
passwd  encrypted
hostname
domain-name
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
name 192.168.1.120 WS1
name 192.168.1.20 kims-machine
access-list outside_access_in permit tcp any host IP ADDRESS eq 3389
access-list outside_access_in permit tcp any host IP ADDRESS eq 3389
access-list inside_access_in permit tcp any any
pager lines 24
mtu outside 1500
mtu inside 1500
ip address outside pppoe setroute
ip address inside 192.168.1.1 255.255.255.0
ip audit info action alarm
ip audit attack action alarm
pdm location 192.168.1.200 255.255.255.255 inside
pdm location IP ADDRESS 255.255.255.255 outside
pdm location  255.255.255.255 inside
pdm location WS1 255.255.255.255 inside
pdm logging informational 100
pdm history enable
arp timeout 14400
global (outside) 1 interface
nat (inside) 1 192.168.1.0 255.255.255.0 0 0
static (inside,outside) IP ADDRESS 192.168.1.200 netmask 255.255.255.255 0

static (inside,outside) IP ADDRESS kims-machine netmask SUBNET MASK
access-group outside_access_in in interface outside
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 192.168.1.0 255.255.255.0 inside
no snmp-server location
no snmp-server contact
snmp-server community public
no snmp-server enable traps
floodguard enable
telnet 0.0.0.0 0.0.0.0 inside
telnet timeout 5
ssh 0.0.0.0 0.0.0.0 outside
ssh timeout 5
console timeout 0
vpdn group pppoe_group request dialout pppoe
vpdn group pppoe_group localname
vpdn group pppoe_group ppp authentication pap
vpdn username
dhcpd auto_config outside
username  password encrypted privilege 15
terminal width 80


Thanks in advance!
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I notice that they are using PPPoE on the PIX...do they have a public static IP address assigned to their ISP account?  Do you have a list of IP's that your mail server allows SMTP relay from?

One other thing I noticed is that their translation timeout is set to 5 minutes which is a relatively short time.  Try increasing the timeout to 20 or 30 minutes.  The only reason I can think of to have such a low timeout value on the translations is if a company has more than 10 or 50 machines on their internal network passing traffic through the PIX and they only have the 10 or 50 user license activation key installed on the PIX...

Author

Commented:
i increased the timout to 20 minutes. yeah they have 3 IPs they have from PPPoe. The mail server is external, it isn't internal. Do i have to allow port 110 to come through?
No, you shouldn't have to explicitly allow 110 inbound because the connection is initiated from the client workstation on the inside network which would be implicitly allowed through with your current configuration.  Have you checked the logs on your mail server to see what it tells you when someone from behind that PIX checks their mail and establishes a POP3 connection?
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Author

Commented:
no i haven't. When i do send an email from like a hotmail account to the mail server. It has a timeout NDR saying that the email was stuck in the company's mail server queue for however many minutes. I'll check those logs though.
That doesn't sound like an issue with the PIX at all, more like something on the mail server.  I would focus on looking at the mail server configuration.  Does this happen with one, several or all e-mail addresses for this customer?  If you create a new e-mail address with the same e-mail domain name that this customer has and try to send a test message, do you get the same results?

Author

Commented:
Yep. There disk quota space was over the limit for their domain. I missed the error in the mail server. Thanks for putting me on the right track. I kept thinkin it was my config for the pix.

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