03-07-2007 07:44 AM - edited 03-11-2019 02:43 AM
hi, am very new to configuring pix firewall's so forgive me if it a silly mistake, i think ive misconfigured my acl because i have already turned off mailguard (no fixup smtp) and i am still not able to send/recieve any email from my internal exchange server(10.35.104.106) but i have access to the internet.
here's my config:
thanks
Alex
Solved! Go to Solution.
03-09-2007 12:53 PM
Hi ..
Went through the logs and config and noticed a strange thing. Check the following syslog message-
%PIX-7-710005: UDP request discarded from 10.35.104.106/28536 to inside:10.35.104.100/domain
10.35.104.106 is trying to send domain traffic to 10.35.104.100. Now if I've checked your config correctly, 10.35.104.100 is the IP address of inside interface of PIX .. right? Is the mail server set to contact PIX's inside interface IP for DNS resolution? If so, please have it point to a legitimate DNS server because PIX cannot do name resolutions. Please reset the mail server to use a DNS server like 4.2.2.2 and then check if mails flow out.
Regards,
Vibhor.
03-07-2007 08:15 AM
Please enter following commands-
no access-list outside_in permit tcp any host 194.74.152.164 eq smtp
no access-list outside_in permit tcp any host 194.74.152.164 eq www
no access-list outside_in permit tcp any host 194.74.152.164 eq domain
access-list outside_in permit tcp any interface outside eq www
access-list outside_in permit tcp any interface outside eq domain
clear xlate local 10.35.104.106
Let me know if this helps.
Regards,
Vibhor.
03-07-2007 08:56 AM
hi, ive changed my acl's so they read like this and now i have recieved one of the email i sent from my gmail account
access-list outside_in permit tcp any interface outside eq smtp
access-list outside_in permit tcp any interface outside eq www
access-list outside_in permit tcp any interface outside eq domain
access-list outside_in permit icmp any any echo-reply
access-list outside_in permit icmp any any unreachable
access-list outside_in permit icmp any any time-exceeded
thanks
Alex
03-07-2007 09:16 AM
Gr8 .. so things seem to be working now ?
03-07-2007 09:22 AM
sorry my post was not very clear i now can recieve emails but not send
Alex
03-07-2007 09:31 AM
Ohh .. thats not good. I've gone through the configuration and its not supposed to block any outbound connections. Please make sure that your mail server is configured correctly.
Also, you can try chaning the maximum dns-length allowed-
no fixup protocol dns maximum-length 512
fixup protocol dns maximum-length 1024
clear xlate
Can you try collecting syslogs at the time you are trying to send outbound mails?
Regards,
Vibhor
03-08-2007 02:55 AM
hi, tryed changing max length on fixup dns with no luck, ive setup syslog and am geting lots of udp packets blocked from the server
ive attched the latest sho run and the output from syslog server during the time the emails were sent and checked the exchange server and messages are waiting to be sent and as soon as i remove the pix email are sent.
thanks
Alex
03-09-2007 12:53 PM
Hi ..
Went through the logs and config and noticed a strange thing. Check the following syslog message-
%PIX-7-710005: UDP request discarded from 10.35.104.106/28536 to inside:10.35.104.100/domain
10.35.104.106 is trying to send domain traffic to 10.35.104.100. Now if I've checked your config correctly, 10.35.104.100 is the IP address of inside interface of PIX .. right? Is the mail server set to contact PIX's inside interface IP for DNS resolution? If so, please have it point to a legitimate DNS server because PIX cannot do name resolutions. Please reset the mail server to use a DNS server like 4.2.2.2 and then check if mails flow out.
Regards,
Vibhor.
03-14-2007 02:03 AM
hi,
i wiped the config on both the mail server and the pix and then reconfigured them both and now mail is flowing in and out.
thanks for all your help
Alex
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