Cisco WAN :: ASA 5510 - Mail Server Error 421 SMTP Connection Went Away
Oct 11, 2011
I've got some problem with my Mail Server since I've migrated to an ASA5510.Actually the server is in a DMZ with a private Ip ( 10.x.x.2) and it is translated to a Public IP ( 194.x.x.65).I use these configuration :
static (DMZ,LAN) 194.x.x.65 10.x.x.2 netmask 255.255.255.255 static (DMZ,LAN) 194.x.x.66 10.x.x.3 netmask 255.255.255.255 static (DMZ,WAN) 194.x.x.65 10.x.x.2 netmask 255.255.255.255 static (DMZ,WAN) 194.x.x.66 10.x.x.3 netmask 255.255.255.255 static (LAN,DMZ) 192.168.0.0 192.168.0.0 netmask 255.255.248.0
Some Users received in there mailbox a system administer error message :
Object : Impossible to deliver : test Your message could not be deliver to one or more of its recipients: 421 SMTP connection went away!
When they try to re sent it some times later, message is sent without problem.
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Jul 24, 2011
I'am using ASA 5510 and I try to understand how PAT is working.I want to add a Mail Server in the LAN and a webmail using port 3000 on the server. ( webmail must be reachable from the WAN)This is my Configuration :actually LAN users access internet using NAT with one global IP ( 194.x.x.69) which is the ASA WAN interface.
WAN ----- ISP Router ---------- FW ---------- LAN -------- Mail Server + Webmail
| (25) | (3000)
194.x.x.69 192.168.1.254 192.168.1.6
I need to forward port 3000 and port 25 from outside to inside.For example, from the WAN : [URL] must be redirect toward 192.168.1.6:3000 . What is the Correct Configuration ? And what about the Inside/Outside Traffic,Is there any configuration to add ?
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Sep 2, 2011
Only trying to have the mail server reachable via the secondary ISP link if the primary ISP link goes out. The public MX records with priority markings should make it so any outside hosts tries the first ISP address then the second ISP address if the first is unavailable. I would be using object tracking to control the default gateway in the ASA. I'm just a bit fuzzy on the NAT with a dual ISP config on single box.It shouldn't happen but... if traffic comes in on ISP2 while ISP1 is still up (and the current default gate) that traffic should return out the ISP2 interface (using the ISP2 address and avoiding asymmetric routing) since there already an existing connection present inside the ASA. Any server initiated traffic would still use the current default gateway defined via object tracking on the ASA.
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Jul 30, 2012
I have an ASA 5510, one public IP address on my outside interface, an internal email server and a private network.I would like...
1: Users on my private network to be able to access the internet (PAT them to external outside address)
2: Email to be delivered to my MX (my single public IP address translated back to my internal email server.
i.e. can I share my single public IP address to serve translation in both directions (private users surfing the Internet (in-to-out) and an outside to inside NAT for email) ?
Email (MX) = 1.2.3.4
Public (outside) address = 1.2.3.4
Email server internal = 10.1.2.3
Internal private subnet for users = 10.0.0.0/8
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Jul 23, 2012
I use a RV082 with dual Wan and I cannot configure two SMTP.
Without authentication; a SMTP is specific of the provider.
When WAN1 comes down, SMTP to be used is the SMTP corresponding to WAN2 and vice versa.
Implementation of authentication with the mail server wil be useful. Possibility of two mail servers with indication of the corresponding WAN is also useful.
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Oct 10, 2011
I 've got some problem with my Mail Server since I've migrated to an ASA5510.Actually the server is in a DMZ with a private Ip ( 10.x.x.2) and it is translated to a Public IP ( 194.x.x.65).Some Users received in there mailbox a system administor error message :Object : Impossible to deliver : testYour message could not be deliver to one or more of its recipients: 421 SMTP connection went away!When they try to re sent it some times later, message is sent whithout problem.
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Nov 20, 2012
I replaced a similar router from a competing company with the AC900 N900 router. I open Live Mail (IMAP) and keep it open during the day. Since switching over, when I periodically look at email on Live Mail, I frequently get a "Windows Live Mail" message saying "Your server unexpectedly terminated the connection. Possible causes for this include server problems, network problems, or a long period of inactivity." I have never received this message from either one of the previous routers - LinkSys, Netgear.
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Mar 21, 2013
I have a ASA 5510 (ver 8.4) and I have been all over the support sites looking for what I am doing wrong. I have a sanitized cut n paste of the OBJECT, NAT, ACCESS-LIST and Packet Tracer output and it keeps failing on the NAT with a rpf-check. Once i get the SMTP flowing I have to open up HTTP and HTTPS to one of the servers also.
Here it is:
RVGW# sh run object
object network WiFi
subnet 172.17.100.0 255.255.255.0
[Code]......
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Jan 30, 2013
I'm trying to configure a simple ACL to block smtp traffic from leaving my LAN -- basically prevent internal users from setting up internet email accounts in their email clients and sending through that smtp server. i want my Exchange server only to send smtp traffic. here's what i have:
-access-list 102 extended permit tcp host 10.10.1.29 eq smtp any eq smtp <===10.10.1.29 is Exchange
-access-list 102 extended deny tcp any eq smtp any eq smtp
-access-list 102 extended permit ip any any
-access-group 102 in interface inside
after i apply this ACL to the ASA, i am still able to send from my internet email address setup in Outlook using my "foreign" smtp server.
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Oct 11, 2012
I have an issue with my mail server(SME Server) which is behind a Cisco ASA 5500(firewall) problem is that if one leaves my network they can receive but can not send email via my SMTP also internal people can only send if they use the IP address of the server rather than the domain [URL]
here is my layout
ISP - ASA 5510 - LAN (includes mailserver)
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Nov 28, 2012
We have hosted spam filter service with 3rd party vendor. My vendor is switching to different spamming services and I need to add ip address lets say 44.33.454.32 to the list of allowed system that can connect to my smtp service. I am going over my firewall 5510 configs and I think I need add the entry like this: “access-list outside-to-inside extended permit tcp object-group obj-44.33.454.32 interface outside eq smtp”. [code]
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May 4, 2011
Configured ASA 5510 with CSC module and working fine.Here i likes to configure, Whenever any users from outside accessing my firewall (like VPN users) that logging information i need to send one particular mail ID.Simply, i likes to enable my fireawall to send logging information to one particular mail id.
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Oct 25, 2012
We have a 5510 (8.2) with the following 4 interfaces (security-levels) inside (95), outside(0), dmz(25), and test (95). The dmz network is 10.10.10.0/24 and the outside interface is 40.133.84.69.We have run into a situation where a dmz hosted iRedMail server running postfix (10.10.10.51) is relaying mail which in some cases points back to us at 40.133.84.69 and into our Exchange server. In these cases in the dmz server's mail logs we see postfix timeout trying to connect to smtp at 40.133.84.69. When I try to telnet from 10.10.10.51 to the outside interface on port 25 it times out.We've tried different ways to allow the outside adapter to permit smtp (or any service!) from 10.10.10.51 but we're left scratching out heads.
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Mar 5, 2012
how to go about setting up the ASA to block any SMTP traffic outbound except for our Exchange Server. This is in relationship to a SpamBot issue that blacklisted us. I have an ASA 5510 running version 6.2(5) / 8.2(2) with three ports. DMZ, Inside and the Outside interface. Up till today, I only needed to block outside traffic to our internal network which I used the ASDM to configure a rule on the outside interface for an incoming rule. I am assuming I need to create an outgoing rule on the outside interface; however, just to make sure I understand the terminology/traffic flow, I created the rule with my computer as the source (192.168.0.131) with ALL destination and the service as HTTP. My logic, which seems to fail here, is that any traffic from my computer going outbound would be blocked; however I am still able to browse... That said, if I were to change the source as the Exchange server and the Service Type to SMTP, it would not actually block traffic and therefore not solve our problem. I even gone as far as permitting traffic from my computer, expanding the hit counter and I see no hits. So I am no doubt doing this wrong. What I do know, is when I first created the rule, a second rule was automatically created (Implicit rule) that deny all sources and blocked all HTTP traffic until I changed it to Permit?
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May 31, 2011
Configured ASA 5510 with CSC module and working fine.Whenever any users from outside accessing my firewall (like VPN users) that logging information i need to send one particular mail ID.
Simply, i likes to enable my fireawall to send logging information to one particular mail id.
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Aug 21, 2011
A recently added outbound rule has left my SMTP communications broken. I have since removed the rule, and had Cisco do some damage control, but it's still dropping some of the SMTP traffic. I get a number of NDR messages each day like the one below:Your message did not reach some or all of the intended recipients. Subject: RE: Christopher, Curt Sent: 8/19/2011 9:38 AM The following recipient(s) could not be reached:
[URL]
on 8/21/2011 9:49 AM
Could not deliver the message in the time limit specified. Please retry or contact your administrator.
<630.SM.Local #4.4.7>
Your message did not reach some or all of the intended recipients. Subject: RE: Christopher Curd Sent: 8/19/2011 9:38 AM The following recipient(s) could not be reached: JWillar@email.com on 8/21/2011 9:49 AM Could not deliver the message in the time limit specified. Please retry or contact your administrator. <630.SM.Local #4.4.7>
I've attached an image of my configuration (ASDM GUI). The part of the image highlighted in green are the SMTP rules. The part highlighted in yellow is another rule that I added about a month ago to block a SYN attack. This rule may be part of the problem because of the order it is in the list. Not sure, though.
I have had two Cisco techs Putty into my ASA to check things out. I think they've done all they can. I wonder at this point if it be wise to just reload the last good running-config I have prior to the Outbound rule being added.
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Apr 28, 2011
Connection denied due to NAT reverse path failure
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Jan 20, 2012
I just installed LMS 4.0 on OS Window 2008 R2. Right now, I know how to add devices in DCR and set SMTP server. My question is
1. I want LMS to send an alert email when Coreswitch is down how to do that ?
2. I want LMS to send an alert email when interface is down (not all interface but specify one) how to do that ?
3. I want to created a custom portlet that monitor only one device and specify interface on it how to do that ?
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Nov 13, 2011
Running lms 3.2.1 CS 3.3.1 on Windows 2003
I need to point the LMS server to a new mail relay, but when I make the change in
CS->SERVER->Admin->System Preferences smtp server
It claims to have made the change successfully but the old IP address remains.
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Aug 23, 2012
I'm trying to change the IP address of the smtp server on cisco LMS 3.2.1;I have changed the IP on the GUi and when it didn't work, in the regdaemon. xml file, but it did not work too;When I capture packets from the LMS, it still sends emails to the old IP;
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Jun 3, 2012
In Cisco ASA 5510 , outlook port only permit ( pop3 995/smtp :587) with TLS encryption. How we can do it thru ASDM .
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Sep 21, 2012
I need to configure my ASA 5520 version 7.3 firewall to translate our SMTP server residing in local LAN to use different IP address from the outside interface which is used by all other computers to access Internet. Under NAT section, I have NATted this internal SMTP server with different IP address(eg x.x.x.1) and also translated the remaining IP addresses in the LAN to the outside interface(eg x.x.x.2)
my problem is, Whenever i check the header for message coming from the smtp server it shows that, the SMTP server is also translated by using the same outside interface public ip address(i.e x.x.x.2) which is used by other client machine to access internet instead of the x.x.x.1. How I can get my SMTP server to use separate IP and avoid to be blacklisted by some domain.
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Sep 20, 2012
I need to configure my ASA 5520 version 7.3 firewall to translate our SMTP server residing in local LAN to use different IP address from the outside interface which is used by all other computers to access Internet.
Under NAT section, i have NATted this internal SMTP server with different IP address(eg x.x.x.1) and also translated the remaining IP addresses in the LAN to the outside interface(eg x.x.x.2)
my problem is, Whenever i check the header for message coming from the smtp server it shows that, the SMTP server is also translated by using the same outside interface public ip address(i.e x.x.x.2) which is used by other client machine to access internet instead of the x.x.x.1.
how i can get my SMTP server to use separate IP and avoid to be blacklisted by some domain.
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May 24, 2012
I write here to see if some kind soul can not solve my problem (which is common to seeso many people around the world). problem: I have a mail server (192.168.1.17) configured static NAT because it is accessible byPublic IP (PPP.PPP.PPP.PPP). Everything works properly from the outside, but if I get my Mail server (on port 443) from the internal network (192.168.1.xxx) there 'verse. This configuration is called Nat inside-to-inside is done by default by some SOHO routers(such as the TPLINK from 25 euros) but Cisco did not succeed. I search on the internet for 2 days without a get nowhere. PS: I have a Cisco 1801 router. (or 1941 as another router).
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Oct 30, 2012
Trying to figure this all out. I'm getting untranslated hits. I posted the config I have so far.
Code...
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Feb 8, 2012
I have configure 887 ADSL router with attached configuration. But users cant access internet properly. (Ex: yahoo and gmail mail cant access)
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May 28, 2012
i have a network setup like the image in the link(url) and am asking how to make the PC's behind the router to reach the mail server??,when i ping the ip of the server i get timeout.
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Mar 14, 2012
When I'm pinging my mail server, it gave me different IP's at different times. As the mail server is actually owned by us, I would like to know if that is possible without the IP actually being changed by someone. This is really critical for me. I didn't mean to cross post so providing the URL of the other place where I posted..
If you'd like I may attach the screenshots for the same, but don't think that will server any purpose.
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Jun 11, 2012
We have configured ASA 5510. We have configure Ethernet 0/0 ( Outside ) connected with ADSL line and Ethernet 0/1 ( Inside ) Local LAN. we have configured NAT and all the traffic is passing through outside interface. Now we have connected ethernet 0/3 ( leasedline ) interface with static public IP. Now we want to allow SMTP traffic to pass through from this interface.
How to configure it if we want our local lan SMTP traffic sending through new leased line ( Static Public IP ).
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Jan 10, 2011
I am deploying a Cisco 1841 in place of our basic DSL router.I have an ADSL WIC and FA0/0 connected to our LAN.LAN IP ADDRESS range is 192.168.1. 0/ 24 I have dynamic and static NAT configured. At this point although I have ACL's configured I have NOT implemented them as yet for the following reason. I am unable to recieve inbound SMTP traffic - now know my MX records are correct as this all owrks happily on our basic DSL router. I can send external emails no problem and all internal email works fine. [code] I am in the process of defaulting the router and programming the barbones to get the link working and see if inbound SMTP works then start building the blocks again.
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Oct 25, 2011
Using an ASA5505, have 1 static outside address, want to access an inside SBS-Server on SMTP, RDP (3389), HTTPS and port 987
Have configured network object nat rules using the asdm, SMTP works (I can telnet to the server on port 25 from outside), however for some reason I can not telnet inside and out on port 25, so outgoing mail does not work. RDP does not seem to work from outside, 987 I havent tested from outside. When I try to create a network object nat rule for https I get this message from the ASA:
[OK] object network SBS-HTTPS
object network SBS-HTTPS
[ERROR] nat (inside,outside) static interface service tcp https https
NAT unable to reserve ports.
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Jun 15, 2011
My mail server is not in my network, it's over internet elsewhere.After installing the ASA 5510, i can not get my mails any more.
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Mar 14, 2012
When I'm pinging my mail server, it gave me different IP's at different times. As the mail server is actually owned by us, I would like to know if that is possible without the IP actually being changed by someone.
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