Cisco Firewall :: Initial Connections To SQL Servers Timeout Through ASA 8.2(1)
Aug 23, 2012
I am on version 8.2(1) of ASA Code.When accessing a SQL server on a secure internal interface,(Traffic is sourcing from DMZ) i'm getting some timeouts on the initial connection on port 1433. All subsequent connections work fine. Packet tracer shows the connection builds properly, and shouldn't have a connectivity issue. The problem server is a webserver that connects back through the firewall to access the SQL server on port 1433. We also have many other webservers in the DMZ which access the same SQL server, but do not have the same timeout issues. Here are my timeouts, from the config
timeout xlate 3:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:05:00 absolute
timeout tcp-proxy-reassembly 0:01:00
arp timeout 14400
I've seen a couple articles about increasing the tcp timeout to 3 hours for the DMZ interface?
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Nov 26, 2012
ASA 8.2(5), uauth absolute timeout is disabled and inactivity timeout is set to 48 hours:
timeout xlate 48:00:00
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 icmp 0:00:02
timeout sunrpc 0:10:00 h323 0:05:00 h225 1:00:00 mgcp 0:05:00 mgcp-pat 0:05:00
timeout sip 0:30:00 sip_media 0:02:00 sip-invite 0:03:00 sip-disconnect 0:02:00
timeout sip-provisional-media 0:02:00 uauth 0:00:00 absolute uauth 48:00:00 inactivity
timeout tcp-proxy-reassembly 0:01:00
timeout floating-conn 0:00:00
Users still get kicked out every 8 hours and they have to reauth. This is a logging message:
%ASA-5-109012: Authen Session End: user 'john', sid 839, elapsed 28801 seconds
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Aug 4, 2011
I have a new Cisco ASA 5505 which I am trying to just setup so that all computers on the LAN can get to the internet (browsing and ping). My current setup attached.
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Oct 30, 2011
I have a new pix 515e for Home practice.
1. I couldn't telnet the switch after configuring. should i have to use cross cable or not to connect PC-PIX? (as new switches and routers run through straight cable). more importantly i couldn't even ping the inside ip which is telnet and ssh enabled.
2. Receiving the following after executing each and every command on global mode.
-Configuration Replication is NOT performed From standby Unit to Active Unit
-Configurations are no longer synchronized.
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Dec 15, 2011
We received an ASA5520-K8 through Cisco's Loan program so we could demo it as a replacement for our aging Cisco 3005 VPN appliances. Given that we are a non Cisco shop (except for specific appliances like concentrators and wireless access points), I don't have a great deal of experience with Cisco gear.I started to set to setup the appliance this morning but immediately ran into issues. The 5520 doesnt seem to be acting as a DHCP server, and worse yet, I can't access the unit even if I hard code the IP on the PC being used for configuration. I have to say that I feel kinda stupid having to post this, since I actually followed the documentation avaiable for this menial task and I fully expect the problem to be a simple one. Namely, I am using two specific sources of info for connections.
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Jun 11, 2013
We are planning to split the Private servers from the DMZ Servers and configure an additional Interface and segment for this purpose.
Private Servers Segment: 192.168.4.0/24 (there is no DHCP all servers' IPs are statically configured)
DMZ Segment: 192.168.3.0/24 (This is a future deployment)
LAN Segment: 172.17.0.0/16
Both, Private Servers and DMZ Servers are in a collocation as well as the ASA5520. There are multiple Branch offices that uses subnets within the 172.17.0.0/16 Network and they are connected to the ASA5520 via Metro-E.
I do not know if this is possible but what I want to do is this:
In order to avoid the change of internal DNS records I want to mask the DMZ servers with a Private Server IP when a Private server or LAN host wants to access it like this:
The FTP server in the DMZ has the IP address: 192.168.3.100. But when a PC from the LAN wants to reach the FTP server it should points to its old IP: 192.168.4.100. This way the PC sends a packet to the ftp.corporate.net (192.168.4.100) the ASA recieves the packet and translate it to the (192.168.3.100) and send it out through the DMZ Interface.
Also if the Private Servers wants to reach the same FTP the ASA will act like a proxy-ARP and send the paquet to the DMZ by means of the translation of the IP.
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Jun 8, 2011
i need to use two LAN connections one of INTERNET and one of internal server
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Jan 11, 2013
I have successfully configured my DHCP server because I can ping it from the clients PC and my clients PC automatically grabs IP from my DHCP. How my clients can have access to internet. Here is my hardware setup: 1. I connect clients PC and one DHCP server in one unmanaged switch2. I have my Bell DSL Modem but not connected yet to one of these machines. I do not know how I can configure it yet to work with my machines.The IP I assigned started at 10.10.200.10 to 10.10.200.90How do I connect the DSL and configure so that it may give everyone access to internet?
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Jun 23, 2012
Does the Host file allow connections to your computer?Although I have placed some server names into the host file, Wallwatcher 5.0 is indicating that those servers have made connections. This didn't seem to be a problem before I took some online advice to add servers to my host file. I use iptables on a WNDR3700 router with DD-WRT firmware. In the iptable rules I've also blocked these servers. One example is cnbc7.net and a couple of U.S. Akamai servers.
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Nov 24, 2012
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Oct 3, 2012
I would like to know something with more accuration about idle timeout configuration. In particular why is impossible to set "half-closed connections" to a value lower than 5 minutes neither through a policy-map? In my particular scenario, my asa is used to nat mobile phones traffic, it should be advisable to use less than 5 minutes
In my configuration I've set the timers as follows:
.
timeout xlate 0:15:00
timeout pat-xlate 0:00:30
timeout conn 0:14:00 half-closed 0:05:00 udp 0:02:00 icmp 0:00:02
[Code].....
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Feb 20, 2013
Faced this recent vulnerability?
[URL]
My understanding is that for ASA 8.4.1 and prior, there's a vulnerability that opening many ssh sessions and one of them times out, the firewalls crashes!
As we have many customers with ASA using 8.2.5(26) (for example) I'd like a confirmation that for fixing that bug I need to upgrade my ASA image to at least 8.4.x.Case that, I believe that all the former firewall configuration must be reviewed because 8.2.x version has many different commands that 8.4.x (for example, NAT)
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Jan 31, 2012
I recently had a firewall that wasn't passing traffic (ASA 5510 running software version 9.1).It turned out it had 130000 active connections. Doing a "clear conn port 53" dropped the active connection count back to 38k, and the firewall started passing traffic again.
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Jun 4, 2012
I have inherited the support of an ASA5520 running 8.0(3)12 code and I believe I have a pretty simple question here that I haven't been able to figure out on my own. I have a few users that connect to the box via IPSEC VPN client connections. They want to be able to leave up a RDP based connection, for monitoring purposes, for a most of the day, but thier RDP connection keeps getting discounnted after a few hours. The VPN connection never gets disconnected, just the RDP session running through it. I have another box running 8.0(4) code and they can leave up the RDP sessions as long as they like without getting disconnected from the server(s). I have compared the configs of both boxes and don't see any glsring differences in regards to the configuration that would cuase the RDP sessions to either to stay up or be disconnected after an inactivity type scenario.
What to look for in regards to identifying the timer that is disconnecting the RDP session after a period of time.
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Aug 30, 2011
I have a 5505 for a small business that has one web server. The web server has a static NAT entry to an IP address and not an interface. There is an access rule allowing any HTTP traffic to the outside IP of the web server. From the web server I can't access the Internet.
All other computers on the network can access the Internet using a dynamic nat rule that uses the outside interface. The web server is accessible from a computer behind the firewall.
If I delete the static NAT entry for the web server I can get on the Internet.
I have turned debugging on and see that an outbound connection is built and then 30 seconds later the connection is torn down with the bytes 0 SYN Timeout message.
I am running 8.0(5).
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Oct 25, 2011
I configured multiple vlan on my Cisco ASA5520. Everything work perfectly except RDP (3389) connections. The connections are established but but after a period of inactivity, the user is disconnected from server (black screen). The same problem happens with other type of connections (client/server), exemple : Oracle, file sharing. Before installing the ASA, computers and servers were in the same vlan and it worked well.
There's a notion of inter vlan timeout connection ?
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Aug 18, 2011
What does a pinhole timeout indicate? [code]
ASA 5505 8.4(2)
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Oct 18, 2012
I would like to understand someting about the behaviour of ASA with our traffic scenario and the management of tcp sessions.
1) In particular we noticed that we have connections with the flags Fin without any acknowledgement. The session is silent (the bytes counters aren't incremented) but it remains in the session table as an established connection with the idle timeout of an established conn.
We have about 20% (60K on 300K total) of conns in this state: at our eyes it seems to be an incorrect behaviour...
TCP OUTSIDE 62.149.128.151:110 INSIDE 10.254.158.12:61527, idle 0:11:36, bytes 433, flags UFIO
TCP OUTSIDE 17.151.0.200:443 INSIDE 10.254.229.94:52367, idle 0:01:25, bytes 4597, flags UfIO
TCP OUTSIDE 184.169.79.33:443 INSIDE 10.255.249.146:60143, idle 0:10:39, bytes 5590, flags UFIO
TCP OUTSIDE 157.55.235.158:80 INSIDE 10.170.37.102:62421, idle 0:00:53, bytes 1770, flags UfIO
2) On the connections considered as half -closed we have received an ack to the fin (r or R flag is present), we would like to set the idle timeout to a value lower than 5 minutes but we were not able to reach that result
timeout pat-xlate 0:00:30
timeout conn 0:10:00 half-closed 0:05:00 udp 0:02:00 icmp 0:00:02
!
access-list timeoutClass extended permit tcp any any eq www
access-list timeoutClass extended permit tcp any any eq 8080
class-map timeoutClass
match access-list timeoutClass
class timeoutClass
3) And this type of conns with a Fin on both side that I'm not able to understand... with an ack on one of the side how can I have the other fin??
TCP OUTSIDE 69.171.247.38:443 INSIDE 10.168.139.244:51236, idle 0:11:28, bytes 10536, flags UfFIO
TCP OUTSIDE 69.171.247.38:443 INSIDE 10.168.139.244:51234, idle 0:12:22, bytes 9070, flags UfFIO
TCP OUTSIDE 88.40.119.73:36962 INSIDE 10.255.93.162:36875, idle 0:13:27, bytes 3562, flags UfFIO
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Feb 15, 2013
We had an issue the other day where doing backups through the firewall (don't ask) caused the "control" session to timeout while the backups were still going on over the "data" connection. This broke the backup about two hours into the job. My first thought was that the backup solution vendor should implement some kind of tcp keepalive for the control connection. A packet capture showed they indeed were -- after 2 hours! Ah ha! Busted! How could they choose such a poor choice of TCP keepalive timer for their application that would not be compatible with the 60 minute inactivity timer that so many firewall vendors use (Cisco, Juniper, Checkpoint and Fortinet all use a default 60 minute inactivity timer for TCP)?
Well, a colleague of mine pointed out that there is actually an old RFC that covers this. RFC 1122. It says:
Keep-alive packets MUST only be sent when no data or acknowledgement packets have been received for the connection within an interval. This interval MUST be configurable and MUST default to no less than two hours.
Now I know that RFC is old (October 1989), but that's all I could find. Is there something that supercedes that? Maybe common sense perhaps? I understand not wanting to fill up your connection table because of mis-behaving applications, but I'm just looking for ammunition to use against the backup solution vendor. Surely they're going to point to this RFC.
ASA(config)# timeout conn ?
configure mode commands/options:
0:0:0 | <0:5:0> - <1193:0:0> Idle time after which a TCP connection state
will be closed, default is 1:00:00
<0-0> Specify this value to never time out
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Jun 2, 2010
When users are VPN connected their telnet sessions timeout after an hour of inactivity. Looking at the connections on the firewall they are showing as idle. Is there a configuration change or something else that has to be modified?
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Apr 13, 2011
How to verify on the asa 5510 , the vpn-idle timeout,is running on default setting(30mts)
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May 14, 2012
I have ASA 5510 with 8.2.4 and 8.0.x OS and all seem to have common problem of idle TCP connections not timing out. The host to host connections are coming over VPN tunnels. I have default timeouts on all the firewalls. I have tried changing global timeouts and as well as host specific timeouts using MPF but doesn't work at all ! The problem is when TCP connections are sitting idle in conn table for days and when connection limit of 50,000 conns reach the firewall starts behaving unpredictably dropping packets or unresponsive! I need the unused idle connections to timeout which is NOT happening either by changing global values or MPF.
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Mar 29, 2011
I am using a Pix 515 with IOS 8.0(3).I have in my access list on the outside interface.......access-list outside_access_in extended permit icmp any 12.23.34.0 255.255.255.0 echo access-list outside_access_in extended permit icmp any 12.23.34.0 255.255.255.0 echo-reply.......in order to allow ping requests and ping replies into my inside network. This certainly works since I can ping the inside from outside and vice versa, but in the ASDM display of access rules, the hit count for these two lines is always zero. If I run 'show access-list', the hit count for these lines is non-zero.
Why doesn't the hit count show up in the ASDM gui display?Also, I have read that the PIX does not treat ICMP in the same way as TCP or UDP and there is no stateful behaviour towards ICMP. However, if I set up a continuous ping from outside to inside and then disable the above access list rule allowing echo requests towards the inside, the ping continues whereas I would expect it to stop.
In the config there is 'timeout icmp 00:00:02' if there is no stateful connection for ICMP, why is there a timeout value for it?
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Jul 19, 2007
I have an ASA5505 running ver 8.0(2). I have configured the ssh timeout, ssh host commands and did the crypt o key gen. I am unable to access the device from the host I am allowing. Is there like ca save all command required? I am trying to use the default pix and telnet password. Do those still work?
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Oct 15, 2011
Our client tried to a download a real time generated file from a website, the generation process around 5 mins, after 5 mins, the file will be started to download
When my client direct connect to internet, the file can be download successfully, but when pass through the ASA 5510 and using the internal IP address, a message something like "Are you sure want to logout from this web page?" appears in Safari after 5 mins, i think the time of the error message appear when a "you can start to download" message send from the server to client, the page session timeout so that make the user cannot download the file from internet as the session is not vaild.
I couldn't find any timeout setting in "show runn", is it possible the setting in ASDM? how can I find it and configure it?
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Nov 28, 2012
Version: Cisco ASA 5510 8.4(4)1
I've installed cisco asa 5510.
When I "show local-host all detail connection "
Normal situation:
105 myfailover:10.255.255.2/0 NP Identity Ifc:10.255.255.1/0,
idle 0s, uptime 1D14h, timeout 2m0s, bytes 18196822
But I got this output ( timeout - )
[URL]
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Nov 21, 2012
New to the ASA 5505 8.4 software version, but here is what I'm trying to do:
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-One server houses drac management (port 445): 10.1.20.92
-One server is the IP phone server using a range of ports: 10.1.20.156
Basically, need to PAT the ports associated with each server to the respective servers behind the ASA 5505. Is anything missing from this config? Do I need to include a global policy for PPTP and SMTP? [code]
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IOS Firewall (ZBF) Limit SMTP connections from same IP
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Jan 9, 2013
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From what I can tell, I am stuck at the point where the manual tells me to enable http server. I ran the command lines several times, executed write mem where available, but when I run the show services command, http is not enabled.
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I'm hoping that once I can get Cisco CP or CPE to discover the device, I can make my way through the GUI to configure since those usually do make sense to me. As of now, I'm in the thick of it ...
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