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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May 31, 2012
I would like to send my ASA 5500 logs to more than one syslog server - is this possible? I can't seem to find it in the documentation.
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Dec 4, 2011
It appears that there are two different types of log information generated by the WLC-5508. The stuff that can be sent directly to syslog seems to be very basic while most of the good log information is sent via snmp trap. Does this setup to log to a SIEM in a manner that gives a good security view into the wireless controller?
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Sep 4, 2012
Currently, we allow /24 into our DMZ as follow: [code] Now, if we need to extended the /24 to a bigger scope ( range of 15 class C networks ) : can I just re-used the static route or should I use a ACL to allow traffic? This is on a ASA5585
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Jun 17, 2011
I am trying to log every connection (Build, deny, etc).But for some reason I don't see them sh log.
[Code]...
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Dec 25, 2012
How to set up logging of commands on syslog server ? (cisco nexus 7010)
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Mar 14, 2012
I found a new bug in cisco IOS 15.1(4)M3 when running EEM script with syslog event detector.If system logging performed using the "logging discriminator" and run concurrently EEM script with syslog event detector, then Cisco router crash and goes to reboot.
Cisco ISR G2 3925E.
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Dec 12, 2011
I am sending TACACS administration logging to a syslog server. When the messages show up on the syslog server, they are 5 hours ahead of the actual time. Time on the ACS is correct - local logging shows the correct time. Time on the syslog server is correct...all other devices/systems sending syslog messages to it are coming through with the correct time. why the ACS syslog messages would be 5 hours ahead?
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Sep 21, 2012
logging buffered 4096 warnings The above causes router to log all the events with severity level 4 or below in buffer.What about logging console warnings command?will the above command cause router to send log messages with severity level 4( warnings severity level) to console only or will the router send all the log messages with severity level 4 or below to console ?
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Feb 5, 2012
I'm looking to configure a syslog server for all of my cisco device logging. I've had a look at CNA and can't find any options to define a syslog server for my switches.
What's the best way to define a syslog server and the severity of the notifications? Also, i'm looking to clear all previous Syste mmessages fon my devices?
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May 5, 2013
I'm trying to view the logs from a Cisco 857W router to a workstation running the Kiwi Syslog server. what I've done is the following:
Config term
Logging on
Logging source-interface BVI1
Logging Facility Local7 (or any other facility you want to allocate for this router.)
Logging [IP Address or Hostname of machine running Kiwi Syslog Server]
End
I see noting on the syslog server. Although I can see the log information on the router Also is there a command to stop the logging from generating or is this on by default.
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Jan 15, 2012
Recently i have upgraded the IOS of ASA5550 (in HA mode) to 8.4.2 from 8.0.5, after OS upgrade we found that the syslog from thses firewalls are not getting captured/transfered to centralised syslog server. The server is reachable from the firewalls.
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Nov 16, 2011
I'm encountering what I think is an issue on logging system on FW ASA 5520 - Asa Version 8.4(2), ASDM version 6.4(5). When I disabled the logging inside a rule from ASDM, or from console with the "log disable" option inside ACL, If I check in ASDM logging real time window I continue to see all the entry related to disabled rules. This is a correct behaviour about ASA logging ? How I can "hide" the entry related to disabled rules (this is what I need for troubleshooting purposes) ?
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Sep 29, 2011
I found a bug in Embedded Event Manager, on Catalyst 4500-E platform with supervisor V-10GE, on various IOS releases (in particular 12.2-50-SG IP BASE w/o crypto, 12.2-54-SG1 IP BASE w/o crypto, but also other releases included latest 15.0-2-SG1 ENTERPRISE SERVICES SSH).The problem is that when you set up a EEM applet that monitors syslog pattern matching, and you also configure remote host logging *with* the option "sequence-num-session", when the match occurs, the switch reboots with message:
Sw (sometimes prints a number instead)
VECTOR D00
and in some cases performs a second reboot with message:
VECTOR 0
DOUBLE FAULT
The reload reason message is:
System returned to ROM by abort at PC 0x0
The problem does *not* occur if remote logging has not the option "sequence-num-session". I verified this behavior on various configurations (included our production 130K long *and* factory defaults after erase startup-config).The configuration statements that cause reload are, for expample:
event manager applet prova
event syslog pattern %SYS-5-CONFIG_I
action 1.0 puts "configurazione modificata"
!
logging host 172.30.10.1 sequence-num-session
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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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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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Dec 28, 2011
I have a question with regard to setting up the ID firewall on the ASA 5585 in a single forest, multiple domain windows network.Currently I have a semi-operational IDF at the top level but can't find users on the lower other domains, here is the setup:I have 3 domains.
[URL]
Both domains have a two way parent-child trust and I can look for users in AD Users/Computer on both domains. I initially setup the ASA to look at domain1.test.com using an LDAP aaa-server per the IDF instructions, and then proceeded to configure the ad-agent. I installed the adagent on the domain1.test.com domain controller configured the settings on that system and had no problem adding users to the firewall and getting functionality within domain1. I looked to see if I could see domain 2 and domain 3 users and found none. I went ahead and added the domain2 system to the adagent on the DC and the system says that it is up, but when I search for users is not pulling them from domain2. Instead, it shows domain1 users as domain2user1. I also configured another adserver in the ASA to search ldap on domain 2 to no avail.The cisco documentation states the following:•Before you configure even a single domain controller machine using the adacfg dc create command, ensure that the AD Agent machine is first joined to a domain (for example, domain J) that has a trust relationship with each and every domain (for example, domain D[i]) that it will monitor for user authentications (through the domain controller machines that you will be configuring on the AD Agent machine). Single Forest, Multiple Domains—All the domains in a single forest already have an inherent two-way trust relationship with each other. Thus, the AD Agent must first be joined to one of the domains, J, in this forest, with this domain J not necessarily being identical to any of the domains D[i] corresponding to the domain controller machines. Because of the inherent trust relationship between domain J and each of the domains D[i], there is no need to explicitly configure any trust relationships.Reading that it sounds like it should just work. I had everything properly configured before I installed the adagent, but I'm guessing that there is a chance that you can't have the adagent on the top level DC and get to communicate with the lower level domains.
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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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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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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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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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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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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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Oct 7, 2011
Does the 5585X supports BGP ? What if someone wants to use Antivirus + IPS feature in that . I have seen IPS modules for 5585X but looks like the antivirus module is not avaliable for 5585X
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Nov 29, 2011
I want to configure Qos for 2 diffrent Vlan 2 , each vlan for 2 mbps bandwidth .(VLAN details VLAN 10 (10.10.x.x /24) and vlan 20(20.20.x.x/24) Is any difference regarding initials configuration B/w ASA 5520 and 5585
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Jan 29, 2012
Am not conversant with Firewalling. however i have need to set up CISCO ASA 5585 out of the box.
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Jun 24, 2012
We are working for a client move from PIX 525 to ASA 5585-X, SSP10. This is a production environment and very critical migration. What are the gotchas which we should be aware off?
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Jun 2, 2013
We have installed 5585-x in active/active mode with transparent firewall. We have created two virtual sersors for vs1 and vs2 in IPS module and linked with ASA context C1(vs1), C2(vs2) and admin(vs0).
As firewall is working in transparent mode, we have bridge IP address for context C1 10.1.1.1 and for context C2 10.2.2.1.
I have added default routed for context C1 10.1.1.2 .It is in the outside of asa and SVI on switch.For the other context C2 10.2.2.2.
IP address range for the IPS module and what should be the gateway for IPS module.AS the traffic is coming from outside and going to inside interface of ASA.
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May 6, 2012
I have registered the license purchased for the ASA 5585X appliances and have received the following listed as features.
> Failover : Enabled > Encryption-DES : Enabled > Encryption-3DES-AES : Enabled > Security Contexts : 20 > GTP/GPRS : Disabled > AnyConnect Premium Peers : Default > Other VPN Peers : Default > Advanced Endpoint Assessment : Disabled > AnyConnect for Mobile : Disabled > AnyConnect for Cisco VPN Phone : Disabled > Shared License : Disabled > UC Phone Proxy Sessions : Default > Total UC Proxy Sessions : Default > AnyConnect Essentials : Disabled > Botnet Traffic Filter : Disabled > Intercompany Media Engine : Disabled > 10GE I/O Plus : Disabled(code)
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Sep 24, 2012
I have a pair of ASA 5585 configured with 2 contexts, C1 & C2, C1 is active on ASA-1 & C2 is active on ASA-2 i did failover test, ping was initiated to host residing behind ASA-1 in context C1 i powered of ASA-1 then both context became active on ASA-2, however during this failover.i saw 4 ping packets drop..
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Jan 28, 2013
I have a new 5585x with only basic ip information on it. I can't get the ASDM to load from any interface. Browser just says cannot load page. I upgraded to 9.1 and ASDM 7.11-52. (Also did not work before I upgraded) I can ping the managment 0 interface and can tftp data to and from it. Also unable to telnet to the management interface. [code]
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Jan 23, 2013
I have ASA-AC-M-5520, can we migrate the license to ASA-AC-M-5585
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Aug 29, 2012
Any document in which is specified who may ACE rules are supported in an ASA5585-SSP-20?I need to compare this an other several specification versus a FWSM. I found the information for the module, but not for the ASA 5585-X..In the data sheet this information is not specified.
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