Cisco Firewall :: ASA 5550 Sending Reset With TTL Of 255

Oct 3, 2011

I have the following problem, right now we have an ASA 5550 connected to the client´s side. A reset is being received on the client´s side, but when we run the sniffers on both extremes of the network, we can see that the reset is not being sent by the server´s side.
We have narrowed it down to the 5550 ASA, but have found no bug that matches the description.
The characateristics of the reset packet are the following:
- It is the only packet with a TTL of 255.

- Both server and client have very different window sizes, and the reset packet even though has the server´s ip and port as source of the packet, it has the client´s window size.

- It has a correct ack number.

-Before the reset is received, there are a couple of retransmissions of the last packet sent.

- We´re handling a VPN tunnel between both servers.

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Cisco Firewall :: ASA 5550 Proxy Inspector Drop Reset

Dec 19, 2012

Outside users with certain public ip addresses are not able to access our website.  Below is a log from our ASA 5550 8.2(5)  on one of the clients that's being dropped.  Packet trace result shows that the outside public addresses are allowed.  We do have a TAC case open.

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Cisco Firewall :: 5550 Firewall Set Up For Redundant Purpose

Mar 3, 2011

i two 5550 firewall set up for redundance purpose . in failover we define two different ip add one for primary and one for secondary .interface Ethernet0/0 nameif outside security-level 0 ip address xxxx. standby xxxx.0.0.2!interface Ethernet1/0 nameif inside security-level 100 ip address standby gateway for host will be (primary fw address) however in case of failover , the secondary fw will be up with ip address that was assigned for primary .in this case the secondary ip add is actually nerver used? similarly do i need to have two public ip address for outside (one for primary and one for secondary )   ? or in case if primary fails the secondary comes onlie and take the ip of primary fw . hence i only need to purchase just one ip address.

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Cisco Firewall :: 5550 Firewall Syslog Message

Feb 22, 2013

I have cisco 5550 Firewall, one messages appear in syslog server from Firewall, (warning) i want to stop this message from appearing syslog traps.

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Cisco Firewall :: Secondary ASA 5550 Firewall Getting Down Automatically?

Apr 17, 2011

I am having two ASA 5550 firewall running in active/standby mode. With in last two months our secondary firewall got down automatically 3 times. Firewall is running with IOS version 7.1.2. how to proceed further troubleshooting because there are not any logs on firewall.

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Cisco Firewall :: ASA 5505 Sending Email Alerts?

Oct 14, 2012

I will be configuring port forwarding to a phone system on the network for remote management. I would like to have the ASA send an email alert when a connection has been made to the open port. Is this possible to do and if so how to configure it.

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Cisco Firewall :: ASA 5500 / 5580 Syslog Keeps Sending To Old Server

Oct 26, 2011

We use multiple ASA 5500/5580 cluster systems running  8.3 software versions.Actually we send all our FW syslog data to a SIEM appliance in a DMZ on a remote firewall (non-asa). Recently we suffered a strange incident while implementing a new SIEM collection station now situated in a dmz that is located on one of the ASA contexts. We redirected the syslog streams to the new client for one of the contexts on the ASA cluster that holds the new SIEM agent DMZ..since we did this and redirected the syslog we see double traffic and spoofing errors on that context
a/ the ASA keeps sending out the syslog traffic to the OLD SIEM agent server ip (there is however no trace of its ip in the config)

b/ the traffic leaving the interconnection interface towards the OLD SIEM agent gets a SPOOFING error on the traffic

c/ strangely the data gets also correctly forwarded to the new SIEM collection stations.
We started out with redirecting traffic on only one of the 5 contexts to the new environment and kept logging the others to the old system.I finally got out of the issue by reconfiguring al the other contexts to forward their syslog towards the same new server , since that moment we no longer have the double logging and spoofing error , all syslog traffic goes correctly to the new SIEM agent. It looked like some remenants of the old syslog config remainded on the asa event after deleting and introducing a new config line (we used the asdm to execute the action) as said either it kept the old config or it looked in the other context and "decided" to keep sending to the old server also mentioned in that syslog can find the behaviour in any buglists either way.

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Cisco Firewall :: ASA 5510 Block Sending Emails From Windows XP?

Apr 16, 2013

I have cisco ASA 5510 with basic configuration (default policies). The problem is that windows XP users are unable to send emails form MS outlook and unable to log on to Hotmail , Gmail or any mailing site. While windows 7 and 8 users are not facing any problem.

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Cisco Firewall :: ASA 5505 - Nat Internal Network Before Sending Over Tunnel

Oct 27, 2011

For a customer I have configured a new ASA 5505 firewall with 8.42 software. I had to build 3 ipsec tunnels to different locations and firewalls. All tunnels are working except one. I have to translate the inside network 1 to 1 to a different private range before it is sent over the tunnel. Each host from network /24 has to be translated to a /24 host and then sent over the tunnel. (e.g. translated to

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Cisco Firewall :: ASA 5550 Two ACL From Outside To Inside

May 13, 2011

I have  ASA5550 ruuning Version 8.3(1) with inside and outside interfaces as below [code] On the inside : I have a server ( that need to be accessed from an outside host (Y.Y.131.34) , so I have the below NAT/ACL  rules. [code] is it right that I have to add two ACL entry for outside host to the NATed IP of the inside server , then again add another ACL entry from the same outside host to the private IP of my inside server o get this communication done?

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Cisco Firewall :: ASA 5550 With IOS 8.0(2) Crashes

Jan 31, 2012

we had just installed our ASA 5550 with IOS 8.0(2) a couple of week ago.
2 interfaces from each slot are being used ie 0/0 for Branch users comming via MPLS cloud ,  0/1 for internal LAN users comming form Core Switch  & 1/0 for Server farm LAN   , 1/1  for Internet (outside)
the first 3 interface are considered inside with sec set at 100   while the 1/1 is outside with sec at 0.
Last night it suddenly started dropping all connections without any warning  or any noticible log form the ASDM logging.
the connection drop would happen for 2 - 3 minutes and would work fine for the next 15 minutes or so..
after conencting the console , we found out that the IOS would suddelny go abrupt and show this display ...
TP-ASA(config)# TP-ASA(config)# TP-ASA(config)# Thread Name: Dispatch UnitPage fault: Address not mapped    vector 0x0000000e       edi 0x24d184b0       esi 0x0000000d       ebp 0x1c6ceaf8       esp 0x1c6ceae0       ebx 0x09e965e0       edx


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Cisco Firewall :: 5550 - How To Do NAT Exemption With V8.4

Oct 4, 2011

I have looked in the books I have (Cisco ASA, PIX and FWSM; ASA 8.0) and googled a good bit but can't seem to find any specific mention of how to do NAT exemption with v8.4. It seems NAT exemption (NAT 0 access-list) was deprecated. Using ASDM, there's no corresponding menu item for this that is obvious.
We have public addresses inside the ASA and want to allow in/outbound connections using these IP's without NAT. The ASA is a 5550.

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Cisco Firewall :: ASA 5550 IPv6 Compatibility?

May 21, 2013

I need to understand if ASA 5550 ver 8.2(1) is comptible with IPv6, if not what is the upgrade path to make it IPv6 compatible. The requirement is dual stack of IPv4 and IPv6 should run in the same HA cluster and later will shift IPv6 completely.
The existing infrastructure is equipped with ASA with HA Active/Active mode. The command output for required details are attached here in txt mode.

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Cisco Firewall :: High CPU Utilization On ASA 5550?

Mar 10, 2013

I have Active Standby ASA5550 setup with VPN premium license. A few days back we had a requirement of SSL VPN connection for and we got a temporary from Cisco for same, this license expired and the ASA reverted to it's original license. 3 4 days after this we saw a sudden increase in CPU utilization (upto 90% + -5%) on the ASA during production hours but were not able to figure out the reason, in order to restore the services we failovered the firewall to secondary and everything worked fine. We were suspecting one of the following but there were no logs for any of this
1. The ASA hardware was haivng problem

2. Some client was doing a DoS attack to bring down the ASA (no logs for this as well).
We took a downtime to look further by failovering the ASA back to primary and it worked fine without any issues ruling out the 1st option. We also came across a licesing doc [URL]
Downgrading any license (for example, going from 10 contexts to 2 contexts).
# Note If  a temporary license expires, and the permanent license is a downgrade,  then you do not need to immediately reload the security appliance; the  next time you reload, the permanent license is restored.
As per this doc, sooner or later a restart was required on the ASA. We restarted secondary ASA and everthing was fine but when we restarted the primary ASA by swtiching over to secondary some of the server (not all) in the DMZ stopped working (even ICMP unreachable) and only came back to normal when the primary ASA was restored and working fine (with failover).
The reboot was done by shuting down the physical link between the Core switch and ASA inside individually.
I am not sure what could be the issue that the servers in the DMZ wen unreachable.

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Cisco Firewall :: ASA 5550 - Two Different Syslogs Servers?

Aug 9, 2010

In my Cisco ASA 5550, I need to set two different syslogs servers, and I need to send the system logs to the first one (only admins login/logout), and the traffic logs and all the rest (informational level) to the second one. Do you know if is it possible or not and, if yes, how to configure it?

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Cisco Firewall :: ASA 5550 Active / Standby With SSL VPN

Jun 12, 2011

I would like to work with two ASA's 5550 in HA (Acitve-Standby)  like perimetral firewalls and also work with another ASA 5540 but like a SSL VPN Remote Access to end users.Which will be the best topology to this scenary?. Perhaps i need to put the ASA 5540 SSL VPN together with the ASA's in HA directly in a port.

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Cisco Firewall :: How Many Outside Interfaces Are Allowed On ASA 5550

Apr 26, 2011

I am using an ASA5550 for a complex secure network that has at least six "outside" networks.  Each "outside" network is assigned to a specific port each set at level "0".  I also have a DMZ, set to level "50".  I am having difficulty with passing traffic from a host in the DMZ to all but one of the "outside" networks.  Is there a limit to the number of "outside" interfaces?  I will provide a redacted config file as soon as possible.

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Cisco Firewall :: ASA 5550 - URL Filtering Using Web Sense?

May 10, 2013

i have Cisco ASA 5550 and i want to do URL filtering using Web sense,can i use Micorsoft Forefront TMG2010 as websense server to do that?
the idea is to filter the HTTP & HTTPS URLs,if the  Micorsoft Forefront TMG2010 is not suitable,refer to suitable Websense URL filtering server?

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Cisco Firewall :: Does 5550 Contains Built In CSC / IPS Modules

Feb 7, 2011

i m looking for asa 5550 product.Part # ASA5550-BUN-K9 - Cisco ASA 5550 Appliance with SW, HA, 8GE+1FE, 3DES/AES
1) does 5550 contains built in CSC / IPS modules.? why i  m asking because the "quick refrence guide " indicates that expansion slots are not available.
2) can asa 5550 natively protects natively against networks attacks against virus / worms  etc with out CSC OR IPS MODULE.?

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Cisco Firewall :: ASA 5550 To ASA 5555-X Migration

Apr 23, 2013

I am about to carry out a migration from ASA 5550 to ASA 5555-X, however I cannot find any detailed document or reliable tool for this migration.

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Cisco Firewall :: ASA 5550 Cannot Logon With ADSM

May 22, 2012

I cannot logon with adsm anymore.when I run adsm, I type in my pw, and the screen keeps displaying "contacting the device". No timeout, just stays this way.I've updated the java version, no luck.I can connect with SSH with no problem. device = asa5550, 8.2(1) asdm 6.2(1) [code]

notice that there is no "with cookie-based authentication" here -- is this relevant?
Rebooting the device is not really an option.

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Cisco Firewall :: ASA 5550 Flags E Connection

May 2, 2012

I have an issue were thousands of connections on the ASA are marked with flags E, below is a visual of the connection. Any ideas what could cause this marking? Also, I can't grasp what the meaing of an outside back connection (ie flags E).
TCP DMZ:X.X.X.X/139 Inside:X.X.X.X/1828,    flags E, idle 9h37m, uptime 9h37m, timeout 15s, bytes 0

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Cisco Firewall :: Link Aggregation On ASA 5550?

Jan 10, 2011

i'm installing a Firewall Cisco ASA 5550 with 8 Gigabit interfaces.
I have installed firmware 8.2.3.
Is it possible to make link aggregation on ASA to have more bandwith?

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Cisco Firewall :: ASA 5520 / 5550 - Cannot Upgrade To 8.3

Aug 7, 2011

I have a couple of ASA5520 and ASA5550, and I wanted to know if it is worth it to upgrade the software from 8.2(4) to 8.2(5)?  Because of the RAM I cannot upgrade to 8.3 for now.

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Cisco Firewall :: ASA 5550 - Cannot Copy IOS From Flash To PC

Jan 8, 2013

I just got a brand new ASA 5550, i configured the port g0/0  on asa with an ip address then configure my computer with ip and default gateway is I'm able to ping the asa from my computer. I remote to ASA thru the console port  and try to copy iOS from flash to my pc but it doesn't work.
Cisco asa# copy flash tftp://
Source file name []? asa804-k8.bin
Address or name of remote host []?
Destination file name [asa804-k8.bin]?
 Writing file tftp://
!%Error writing tftp:// (Timed out attempting to connect)
Cisco asa#

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Cisco Firewall :: How To Compress Data On ASA 5550

Apr 6, 2011

I have two box cisco asa 5550 in multiple context mode and failover.
My network topology is:
                                Outside Network
DMZ2 Network • • • • (CISCO ASA 5550) • • • • DMZ1 Network
                                Inside Netowork
My interface "Inside Network" is full(I think).I can't diagnose this, based on command "sh interface gigabitEthernet"
109042974565 packets input, 100691006385765 bytes 
94097614769 packets output, 59002295942465 bytes
999339444 packets dropped
My interface is 1GB, based on the above command, it is full?If interface is full, i have a problem! All the ports on asa firewall are using, how do resolve this? I can compress all data on this interface with class maps and policy maps?

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Cisco Firewall :: Not Able To Access ASA 5550 Through ASDM

Apr 22, 2013

We are having Cisco ASA 5550 appliance. from some days i am not able to access this ASA using ASDM. I am able to access ASA using SSH.[code]
At the same time standby firewall works perfectly fine with ASDM. I have tried by reloding the firewall, then it worked for 2 days & again stopped working.

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Cisco Firewall :: ASA 5550 - TCP Session Resets

May 1, 2012

Our users are using Xmanager to connect to a NNM connection which is going through a Cisco ASA5550 with 8.3. The session of Xmanager is getting terminated exactly after 1 hour and the users have to reconnect it again. How can we make the session to be up always, when I am bypassing the Firewall its always up.

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Cisco Firewall :: ASA 5550 Module 1 Interface

Oct 25, 2011

Is it possible to use ports from 2 SFP and 2 RJ45 Interface on ASA 5550 Module 1.

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Cisco Firewall :: Import ASA 5550 8.2 (5) In CSM Version 3.3.1?

Feb 14, 2012

if i can import an ASA 5550 8.2(5) in CSM version 3.3.1?

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Cisco Firewall :: ASA 5540 - Sending Logging Messages To Ftp Server Has Stopped Suddenly

Apr 21, 2013

on ASA 5540 ,   i configured the logging setup as following :
log in to the internal buffer : buffer size 1048576 bytes

Then i save the buffer to FTP server to save the log messages in continuously way everything was working fine but suddenly sending the ftp traffic to FTP traffic has stopped suddenly before in the live log viewer it was showing when ASA throws the ftp traffic to the ftp server but this stopped suddenly nothing has changed in the ftp server setting (same username and password and the connectivity is there) sending logging traffic to the ftp server came back just when i reboot the ASA.but this is not solution.

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Cisco Firewall :: ASA-5550 - HTTP Error 403 - Forbidden

Jul 27, 2011

We're getting this error message randomly when surfing the Internet. We have websense running on our network to perform web content filtering and are using the ASA for the http/https redirects. We've contacted websense and they said this error message is coming from the ASA, not their product.
version 7.2.4

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Cisco Firewall :: ASA 5550 - Optimize Performance For Web Traffic?

Mar 14, 2011

We are suffering slow https traffic download. We have a CISCO ASA 5550, Cisco Adaptive Security Appliance Software Version 8.0(5)19. When we try to download some videos from an https server we have a data download rate of about 140 kbps, but if we bypass the firewall and put a laptop just after the border router, data rate increase up to 350-400 kbps.
We configured a new interface in the firewall and we connected a laptop directly to the port in the ASA 5550, with a new ACL permit ip any any, just for test purposes, but data rate is still the same, 140 kbps.

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