Cisco Firewall :: 5510 - Outlook Port Only Permit (POP3 995 / SMTP 587) With TLS Encryption

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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Cisco Firewall :: ASA 5510 Ways To Allow Outside Adapter To Permit Smtp

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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Cisco Firewall :: ASA 5510 - Setting Up SMTP Port Block?

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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Cisco Firewall :: ASA 5510 - Setting Up ACL To Permit Access Only To The Nat Subnet?

Apr 9, 2012

setting up an ACL on my ASA 5510 to permit access only to the Nat subnet from inside to the outside interface. This firewall is setup for the DR solution in the production network. I am applying following acl in the inbound direction on the inside interface.
 
permit ip any "Nat_subnet"
 
After appliying this acl to inside interface I observed that I can ping to the destinations in NAT'ed subnet but unable to ssh to the servers. Following is the summary of my configuration.

!
interface Ethernet0/0
nameif outside
security-level 0
ip address 192.168.135.241 255.255.255.248 standby 192.168.135.242

[code].....

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Cisco Firewall :: ASA 5510 - See Logged Traffic On Permit Rules

Feb 9, 2012

I have a rule which permits traffic to a web server and logging is enabled.  But when I go to syslog I am only seeing traffic which has been denied.  What needs to change to be able to see the logged traffic on permit rules?

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Cisco Firewall :: ASA 5510 With 8.0.2 - Exchange 2007 Outlook Anywhere / OWA Users

Aug 15, 2011

We have a ASA 5510 which was running 8.0.2, we recently upgraded it to 8.2.5 and since the upgrade remote users for exchange 2007 are not able to download any large email attachments(over or close to 1MB). This is only happening to Outlook anywhere users or OWA users who are connecting to the exchange server using https(443) externally. If the same users connects internally they do not face any issue. When i check the logs on ASA i am gettings lots of RESET-O and RESET-I entries. Looks like the connection between the client and the server gets reset.

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Cisco Firewall :: Setting Up ASA 5510 Cannot Get SMTP To Come In

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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Cisco Firewall :: ASA 5510 ACL For Blocking Outbound SMTP

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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Cisco Firewall :: Accessing SMTP From Outside Network Through ASA 5510?

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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Cisco Firewall :: Add IP Address For SMTP Services ASA 5510

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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Cisco Firewall :: No Available Encryption Algorithms In ASA 5510?

Oct 22, 2012

I have a cisco asa 5510 running ver 8.02, when i navigate to "remote access vpn-> advanced->ssl settings" i could not see any available algorithms under encryption section. How can i add the encryption algorithm in? I need the encryption algorithm as i want to enable ssl authentication using cert on my asa interface.

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Cisco Firewall :: ASA-5510 Dropping Outbound SMTP Traffic?

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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Cisco Firewall :: 5510 Single Outside Public / Can PAT Out And NAT SMTP Server Back

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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Cisco Switching/Routing :: Configure Pop3 Port To Be Open On ASA 5505?

Apr 29, 2013

I need to configure pop3 port to be open on my ASA 5505. I've created an acl and static route to do this but for some reason, it's not open.

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Cisco Firewall :: ASA 5505 Blocks Outgoing Smtp (port 25)

Nov 25, 2012

i cannot send emails to outside, i have an access rule on interface inside permit source: inside  destination: any servic: tcp/smtp and when i make paket tracer  it shows me that the packet is dropped but i cant see through which rule!!
 
ASA version: 8.4(3)
ASDM version 6.4(7)

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Cisco Firewall :: 5510 How To Configure Local LAN SMTP Traffic Sending Through New Leased Line

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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Cisco WAN :: 800 Router - Permit Some IP To Connect Over Port 3389?

Apr 22, 2011

Below is my show run of a Cisco 800 router (Two VLAN's, single WAN) that works fine. Problem is that in this senario port 3389 is open for everyone. Only two remote users are allowed to connect trough port 3389. Let's say WAN IP's : 22.33.44.55 and 66.77.88.99. How would a good access-rule look like to fix it?

no service padservice tcp-keepalives-inservice tcp-keepalives-outservice timestamps debug datetime msecservice timestamps log datetime msecservice password-encryptionservice sequence-numbers!hostname cisco-867!boot-start-markerboot-end-marker!logging buffered 51200logging console criticalenable secret 5 ***!no aaa new-modelmemory-size iomem 10clock timezone GMT 1clock summer-time GMT date Mar 30 2002 1:00 Oct 26 2035 1:59!!no ip source-route!!ip dhcp excluded-address 192.168.10.200 192.168.10.254!ip dhcp pool Vlan2 network 192.168.10.0 255.255.255.0 domain-name dsl.local default-router 192.168.10.254 dns-server 213.144.235.1 213.144.235.2 lease 0 8!!ip cefno ip bootp serverno ip domain lookup!!!archive log config

[Code]....

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Cisco Security :: Securely Access Exchange Server 2007 Through ASA 5510 Using Outlook

Dec 26, 2011

Is there any way to access a MS Exchange Server 2007 on Windows server 2008 through an ASA 5510 running 8.4 with a full MS Outlook client (not using OWA - web browser)?  OWA is currently working fine but I was wondering if access via the full Outlook client is possible and more importantly...is it opening up too many ports on my 5510? 

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D-Link DIR-655 :: Outlook / Exchange Port Block

Aug 22, 2011

I can connect to Internet perfectly fine.  I can even VPN back into my office.  However, once connected via VPN and I launch my Outlook Client, I'm not able to connect to get emails.  When I run a "netstat -a", I get my "SYN_SENT" to all my office domain controllers and exchange servers.However, if I connected via my Starhub USB Broadband dongle, everything works perfectly fine.What settings do I need to do on my router?  I tried port forwarding and application rules but none worked.

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Cisco Firewall :: How To Permit Traffic From Outside To DMZ On ASA 8.4

Jan 22, 2013

I Have this Topology: R1 is as server and i want to public that server in INTERNET using public IP 7.7.7.7, but i can not do that. I tried to do a NAT but it just translate from DMZ to Outside, however i can not to ping to 7.7.7.7 from Outside (R2).
 
I have a route in R2

7.7.7.7 [1/0] via 200.200.200.1 
On R2 i can´t ping to 7.7.7.7
On R2 i can´t ping to 172.16.0.2
On R1 i can ping to 200.200.200.2
On Inside i can ping to 172.16.0.2
 
when i try to ping from DMZ to Outside (200.200.200.2) the debug, and show nat details, show me:
 
ciscoasa(config)# nat: translation - dmz:172.16.0.2/26 to outside:7.7.7.7/26
nat: untranslation - outside:7.7.7.7/26 to dmz:172.16.0.2/26
nat: untranslation - outside:7.7.7.7/26 to dmz:172.16.0.2/26
nat: untranslation - outside:7.7.7.7/26 to dmz:172.16.0.2/26
ciscoasa(config)#
ciscoasa(config)# sh nat detail

[code]...

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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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Cisco Firewall :: Cannot View Permit Entries In The Log On ASA 5520

Apr 6, 2011

I can not seem to view my "permit" entries in the log on my ASA 5520. I set up logging-lists, changed the level to 3 on  the logging statement, and simply can't find it anywhere.
 
Partial config:
 
logging enabled
logging timestamp
logging JC-L3 level errors
logging monitor JC-L3
logging buffered JC-L3
logging trap notifications

[code]....

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Cisco Firewall :: Open A Port In ASA 5510 Firewall Using ASDM?

Oct 20, 2012

I would just like to to open UDP port 123 in the ASA 5510 Firewall so that our Primary Domain Controller could use this port to sync time with an external time source. We have already added an access rule for this port under the firewall configuration in ASDM 6.4 and this port was also allowed in the inbound and outbound rule of the PDC's Firewall but it seems that it was still blocked.

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Cisco Firewall :: ASA 5520 - Permit Traffic To Inside Via MAC - Address?

Apr 6, 2011

I have a handheld device that will be used for inventory outside of our office. It has 3g capabilities. Is there anyway I can permit traffic from this device from the outside world coming into my network?  I need to open a couple of ports so it can hit the server. But I have no intention to open these ports up to the entire world.  I use an ASA 5520 with a managed router from our provider. I looked around on the Cisco site and the only information I found was for permitting and denying traffic from devices that are within the network.

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Cisco Firewall :: ASA5510 Permit Incoming Connection From Remote LAN

Sep 4, 2011

Actually all service from site to site is permitted, without restriction.I want to insert an ASA to block some internet traffic on main site.I try to configure my ASA5510.No problem for outgoing connection or to permit a single service on main site.But impossible to give access to all service/connection from all remote site to main site. [code]

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Cisco Firewall :: ASA 5585- TCP Syslog / Logging Permit-Host Down

Jul 5, 2012

We have a firewall service environment where logging is handled with UDP at the moment. Recently we have noticed that some messages get lost on the way to the server (Since the server doesn't seem to be under huge stress from syslog traffic). We decided to try sending the syslog via TCP. You can imagine my surprise when I enabled the "logging host <interface name> <server ip> tcp/1470" on an ASA Security context and find out that all the connections through that firewall are now being blocked. Granted, I could have checked the command reference for this specific command but I never even thought of the possibility of a logging command being able to stop all traffic on a firewall.
 
The TCP syslog connection failing was caused by a mismatched TCP port on the server which got corrected quickly. Even though I could now view log messages from the firewall in question in real time, the only message logged was the blocking of new connections with the following syslog message: "%ASA-3-201008: Disallowing new connections."
 
Here start my questions:
 
- New connections are supposed to be blocked when the the TCP Syslog server are not reachable. How is it possible that I am seeing the TCP syslog sent to the server and the ASA Security Context is still blocking the traffic? 
- I configured the "logging permit-host down" after I found the command and it supposedly should prevent the above problem/situation from happening. Yet after issuing this command on the Security Context in question, connections were still being blocked with the same syslog message. Why is this? 
- Eventually I changed the logging back to UDP. This yet again caused no change to the situation. All the customer connections were still being blocked. Why is this? 
- After all the above I removed all possible logging configurations from the Security Context. This had absolutely no effect on the situation either. 
- As a last measure I changed to the system context of the ASA and totally removed the syslog interface from the Security Context. This also had absolutely no effect on the situation. 
 
At the end I was forced to save the configuration on the ASAs Flash -memory, remove the Security Context, create the SC again, attach the interfaces again and load the configuration from the flash into the Security Context. This in the end corrected the problem. Seems to me this is some sort of bug since the syslog server was receiving the syslog messages from the SC but the ASA was still blocking all new connections. Even the command "logging permit-host down" command didn't wor or changing back to UDP.
 
It seems the Security Context in question just simply got stuck and continued blocking all connections even though in the end it didn't have ANY logging configurations on. Seems to me that this is quite a risky configuration if you are possibly facing cutting all traffic for hundreds of customers when the syslog connection is lost or the above situation happens and isn't corrected by any of the above measures we took (like the command "logging permit-host down" which is supposed to avoid this situation altogether).

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Cisco WAN :: 7200 - How To Block SMTP Port 25 On Router

Jan 24, 2012

We are running ISP and now a days we have many spam in our network, we want block the SMTP port 25 block on Cisco router 7200.  So we can block the spam in our network.

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Cisco Routers :: RV042 SMTP Port Change?

Mar 27, 2013

I have an RV042 that I have configured to send alert logs to a comcast email address. Recently comcast changed their SMTP port from 25 to 465. I can't find where to change the port settings in the RV042 to send the router logs via port 465.

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AAA/Identity/Nac :: ACS 5.1 Custom Smtp Port Number?

May 31, 2012

I have a ACS 5.1, My mailing server does not run on standard port number of smtp (25). Need to know if i can customize the port number suiting my mailing server requirement.

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Cisco Firewall :: 2901 - How To Avoid SMTP Inspection On Zone Based Firewall

Aug 2, 2011

We had a problem with SMTP inspection dropping some regular emails (Cisco 2901 IOS 15.0). The original configuration.

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Cisco Firewall :: 2901 To Avoid SMTP Inspection On Zone Based Firewall

Jun 21, 2011

We had a problem with SMTP inspection dropping some regular emails (Cisco 2901 IOS 15.0).Incoming mails are going thru Spam and Virus Blocker so that bypassing SMTP inspection is not security issue in this case.

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Cisco WAN :: Microsoft Outlook Though ASA5505 Firewall

Nov 16, 2011

I have some users from another company who are visiting my company. The use outlook to access their mail. I think it is via RPC over https (ssl). When there are on my network they are unable to send messages but when the connect to an ISP directly they are able to send. I have a cisco 2821 as my internet router and an ASA5505 (8.0.5...i downgraded it from 8.2.3) as my firewall. I have not blocked anything from going out. Of note is that when other users use window live configured for gmail....which uses tls they are unable to send emails with atachements. Regular emails go though no problem. Hotmail can send atachments without a problem (there is no encrytion there). I have narrowed the issue down to how the firewall treats esmtp or tls traffic passing though it. I have already diabled inspect esmtp on the firewall.

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Cisco Firewall :: ASA 5510 6.1 To 8.X Via USB Port?

Jul 23, 2012

I've got an unconnected ASA 5510 running IOS 6.1 that I need to upgrade to 8.X (I believe 8.4 is available). The unit is a blank/default configuration and is not on any network so it can't be easily accessed via Ethernet. Is there a method that I can use its onboard USB port (0 or 1) to plugin a USB memory stick with the 8.X...bin file and process the upgrade that way?

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