Cisco Firewall :: ASA 5520 Denying SSH Connection
Apr 9, 2013
Device Cisco ASA
Model:5520
OS 8.4(2)
I am not able to access the device via SSH .After connecting to teh console I have found that allowed SSh session are fully utilized with show resource usage command and the output is [code]
So I used show ssh session command to see who is using the sessions but in the output it has showed only one session and the output was [code]
I was wondering why it shows only one session above instead of showing all the 5 sessions which are utilized as confirmed by show resource usge command.We are usning some internal tool for ssh monitoring on device which is poling the device after a fixed interval for port 22 reachabilty .I dont think these tools are making any issue as this is secondary firewall and we are not facing any reachabilty issue for primary firewall.also we are using 10 min for idle ssh timeout.
View 13 Replies
ADVERTISEMENT
Mar 6, 2012
I am migrating an asa 5520 from 8.2 to 8.3 and after the migration the ACL's are blocking access to the DMZ. It looks like the NAT functions were migrated properly by the migration tool but now when I try to access devices in the DMZ the ACL is denying the traffic because my acls in 8.2 had the NATTED IP, not the real IP in the ACL. Now it looks like 8.3 is looking for the real IP and not the NATTED IP.
Here is an example:
Inside network: 172.24.0.0/24
DMZ server real IP: 1.1.1.1
DMZ server NAT IP 2.2.2.2
so, in 8.2 I would have an ACL on the inside interface that said permit 172.24.0.0/24 to 2.2.2.2 eq 80, 443. This acl doesn't work in my 8.3 config because it wants: permit 172.24.0.0/24 to 1.1.1.1 eq 80, 443.
Is this correct for 8.3 or are my NAT rules all messed up after the migration?
View 2 Replies
View Related
Apr 23, 2013
I'm having a (fairly common) problem with my ASA in that I cannot get traffit to pass through it. I can't determine the source of this problem and need getting traffic from my inside network (10.1.2.1, please ignore anything labled 192.168.X.X) to my outside network.
-The border router can ping the Internet, itself, and the ASA's outside int (10.1.1.2)
-The ASA can ping everything
-An ASDM can connect and can manage the ASA via the 10.1.3.2 management cloud
-The inside router (R2) can ping the inside int of the ASA but not the outside
I've tried in both the CLI and ASDM to: -Add network objects to prepare configuring NAT (objects required after 8.3 I believe) -Configure NAT (static) -Configure ACL's to allow any traffic in any direction (just for these initial testing purposes) -Allow ICMP inspection (which was weird because my ASA had no global_policy and I had to make one)
The ASDM doesn't show any logging traffic when I try to ping from R2 (192.168.150.150 or old 10.1.2.2) to my Border (either ints, both being inside 10.1.1.1 and outside 172.16.68.190). Again, I can't even ping the outside int of the ASA from R2. [code]
View 10 Replies
View Related
Aug 15, 2012
We are implementing an ASA 5510 firewall with DMZ. Our UDP packets are able to get outside the firewall, but our TCP packets are being denied because of no connection. I've attached the config file and log file.
View 2 Replies
View Related
Dec 12, 2012
I have a problem with the connections to the remote webservice passing through ASA 5520 firewall. Connections are usually interrupted in perod of half an hour in every few days.
This ASA 5520 firewall is only one firewall in a path to the remote webservice.
During the interruption I find the logs:
UTC: %ASA--4-419002: Duplicate TCP SYN from dmz1:x.x.x.x/.... to outside:y.y.y.y/p with different initial sequence number
Teardown TCP connection 28309406 for outside:y.y.y.y/p to dmz1:x.x.x.x/.... duration 0:00:30 bytes 0 SYN Timeout
How I could find root cause? Could it be solution implemetation of TCP State Bypass?
View 1 Replies
View Related
Oct 7, 2012
We recently replaced our Cisco 5510 with a 5520. I had the SSL Client VPN working on the 5510, I cannot get it working on the 5520. The IOS version is 8.2(5) and the ASDM version is 6.4.I run through the SSL Client wizard and get everything set up. When I try to get to my outside interface Internet Explorer just comes up with an error. When I try to connect through the Cisco AnyConnect client on my Android it used to come up with a "No address available for SVC connection". After deleting an address pool not even related to my SSL VPN profile I cannot get that far. I just get a "login failed". Even after I create a user with level 15 privilege and assign to my vpn group policy.I still get the "No address available for SVC connection" when I try to connect to the default profile, which doesn't really go anywhere.
View 23 Replies
View Related
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 ?
View 5 Replies
View Related
Jun 24, 2012
I have a Cisco ASA 5520 that I'd like to be able to connect directly to our gigabit fiber connection (we're currently connected through a media converter that's causing problems). I've found the following:Cisco ASA 5500 Series 4 Port Gigabit Ethernet Security Services Module [URL]. I only need a single fiber connection, as opposed to the 4 copper + 4 fiber.
View 1 Replies
View Related
May 30, 2013
We are working with an ASA 5520 and it seems there is an issue with some email messages sent throught it. When there are many recipients in the emails the email messages are not sent, and I have revised the server an the only thing I see is connecting dropped. When I went to see ASA log and see this log report: ESMTP Classification: Dropped connection for ESMTP Request from 'interface': servername/portnumber to outside: IP address/25; matched Class 2: cmd RCPT count gt 100 tcp flow from interface:servername/portnumber to outside: IP address/25 terminated by inspection engine, reason - inspector disconnected, dropped packet. So I think there should be an inspection of ESMTP packets and if they detect an email message sent to over 100 addresses, then the packet is dropped, am I right? if so, what should I do to let those email messages be sent?
View 6 Replies
View Related
Nov 28, 2012
I have a Cisco ASA 5520 that we was working properly. I tried to create a VPN IPSEC to test but when I finished the wizard I lost the conection between the inside interface and outside. I use other interface for DMZ and other for printers network but this adapters are working properly. I have reviewed the NAT's and the ACL's but I don't see the problem?
I have delete the VPN IPSEC but it's still not working and I have the network down
View 2 Replies
View Related
Oct 19, 2011
I have a server in a DMZ behind the ASA, connections to this server work sometimes and then fail others, so I dont think i'm looking at an ACL or NAT problem here.The syslogs report a SYN Timeout,I have taken a trace on the ASA, it seems that a SYN-ACK does come from the destination server within the 30sec timeout, but its not passed through the ASA back to the source ? there is one odd thing, what seems to be an out of sequence ACK from the destination which arrives before the SYN-ACK at the ASA, i'm wondering if this might be the problem ? This only occurs on the connections which fail, the connections that work, the destination responds quickly to the initial SYN, and the 3way handshake completes.
Syslogs :
Oct 18 19:17:32 nzlsudfedsi001-pri Oct 18 2011 19:17:32 NZLSUDFEDSI001 : %ASA-6-302013: Built outbound TCP connection 42327212 for IIP-ARCHIVE-PROD:172.24.32.31/21 (172.24.32.31/21) to BPO-TRANSIT:x.x.x.x/59392 (x.x.x.x/59392)
Oct 18 19:18:02 nzlsudfedsi001-pri Oct 18 2011 19:18:02 NZLSUDFEDSI001 : %ASA-6-302014: Teardown TCP connection 42327212 for IIP-ARCHIVE-PROD:172.24.32.31/21 to BPO-TRANSIT:x.x.x.x/59392 duration 0:00:30 bytes 0 SYN Timeout
[code].....
View 2 Replies
View Related
Mar 27, 2011
Ive got a virtualised firewall running 3 security contexts in routed mode. What am experiencing is that i cannot connect to an OUTSIDE host through the security contexts. From the firewall itself i cannot ping the directly attached host on the OUTSIDE interface but i can ping the directly attached host on the INSIDE interface. When i reload the firewall box, the first ping to the OUTSIDE host would be successful but subsequent pings fail and thus total connectivity is lost.
I even tried upgrading to ASA version 8.4(1) but still the same.
View 5 Replies
View Related
May 1, 2013
We have ASA 5520 firewall.For broadband Internet access, we have T1 Router(edge router provided by ISP) which provides public IP's 198.24.210.224 / 29. We have usable public IP's 198.24.210.226 - 198.24.210.230 with default gateway 198.24.210.225. We assigned 198.24.210.230 255.255.255.0 to the outside interface.
If we connect the ASA 5520 outside interface directly to T1 router, can all packets with destination addresses 198.24.210.224/29 reach the outside interface without using other device like another router or switches?I just assume that only packets with destination address 198.24.210.230(outside interface ip) can reach the outside interface from the edge router.Is it wrong assumption? If it is correct, then is there any way to route all packets with destination address 198.24.210.224/29 to the outside interface?
View 3 Replies
View Related
Jun 27, 2012
I am using a pptp server running on windows 2008 server and I have configured my ASA 5520 to let the PPTP traffic to pass throught.
The solution works quite well but exactly every 120 minutes the connection drops and people have to reconnect. Is there any setting to change? In the PPTP server I haven't found any setting to change.
View 2 Replies
View Related
Nov 11, 2012
Currently in our environment we have have two buildings with an ASA 5520 in each and a core stack of 3750's in each building. I am currently working on a network segmentation project and am thinking of adding another stack of 3750's in each building to add more redundancy to our network. This will allow our access layer switches to have a trunk to each stack and prevent an outage if one of the links or stacks were to go down.
My question is how I would set this up on the ASA end of things while using a common subnet and HSRP on the 3750's. I understand how to use HSRP and STP on the switches to achieve this on the 3750 end of things. I saw you can do etherchannel on the ASA with 8.4 but how does that work in a failover situation?
View 2 Replies
View Related
Nov 3, 2011
I have a client that has an ASA 5520 that has two internet connections, FIOS and Comcast. The ASA is configured to failover from the FIOS to the Comcast if the FIOS fails. This works perfectly fine. However, I was wondering if VPN and other inbound traffic will come into the secondary connection when it is active. I think VPN will work inbound when the FIOS connection fails, but I am not sure about the other inbound connections.
View 1 Replies
View Related
Mar 14, 2012
A quick query regarding setting up a local user on a Cisco 2811. I have setup a few users as they need to have remote VPN access into our edge router, this works fine and I'm happy with it. The only thing is that when they come into the office they now have logins to get onto the router, they do not have the enable secret so they can't exactly do a lot (plus I've created them with privilege 0 which cuts a few extra CLI options) but I'd rather not allow them access at all if possible.If they weren't on DHCP then I could setup an access-list but this isn't really an option, I could also set me up statically and deny everyone else, but yet again I'd rather not.Is there anyway to restrict telnet/ssh access based on user alone? So when they put in their login it just boots them out. I could setup something like RADIUS (and therefore remove the local users completely) but I think it will be a bit over kill for the sake of a couple of users.
View 1 Replies
View Related
Mar 18, 2013
I've got a 3750x stack set up as my core switch (only a small-ish environment) - I'm shortly going to be deploying an enterprise wireless network with Corporate and Guest SSID's. I'm going to be putting all traffic from the Guest SSID in VLAN 244, and don't want it to have access to any of the other VLANs (1 (Legacy Eqpt), 4, 8, 12, 16, 20, 24, 28, 32, 248 & 252).
IP ranges for all the main VLANs are:
1: 10.0.0.x/22
4: 10.0.4.x/22
8: 10.0.8.x/22
12: 10.0.12.x/22
16: 10.0.16.x/22 etc etc (you get the pattern)
I'll probably give Guest traffic (VLAN 248) the IP range 192.168.10.x/22 (not because I NEED that many addresses, but it's easier for everyone to remember/understand if I keep the subnet masks the same all round). However I also have a CCTV VLAN (252) which already has the range 192.168.0.x/24, which some people in other VLANs WILL need access to.
So my question is: What is the syntax for the ACL on my 3750x (IP base - 15.0.2) to prevent traffic from VLAN 244 gaining access to any of my other VLANs. I'm making a broad assumption here that a layer 3 switch is perfectly capable of supporting that function? I need ALL the syntax for setting up ACL's - I've never done it before
My gateway device by the way is 10.0.4.1, and I do have inter-VLAN routing set up on the core switch (obviously).
View 3 Replies
View Related
Nov 2, 2012
We were using ASA-5520-K9 with ASA-SSM-AIP-20-K9 but recently found some hardware problem in our running ASA. Now cisco want to replace with ASA-5520-K8.
View 1 Replies
View Related
Feb 27, 2013
I'd like to see some REAL LIFE comparisons of ASA firewall throughput (a bit like this one for ISR G2 Routers - [URL].
The reason I ask is that I recently upgraded a firewall from an ASA5505 to an ASA5520 on a small network where the only outside connectivity was a single 10meg Internet circuit with an IPSEC VPN (not landed on the firewall but on a router) to another site.
When I swapped out the firewall the users noticed a big improvement. The firewall is not doing anything out of the ordinary - no IPS or VPN, just standard state full inspection.
View 5 Replies
View Related
May 5, 2013
I have an asa 5520. How would I configure my dedicated management interface to be able to route off subnet while the firewall is in transparent mode?
View 1 Replies
View Related
Jul 26, 2012
We are using the newest release of AD Agent (1.0.0.32.1, built 598). The ASA Firewalls 5520 are having the software release 8.4(3)8 installed.When somebody tries to connect thru the Identity based firewalls from a citrix published desktop environment (PDI) the connection is not possible. Checking the ip-of-user mapping on the firewalls (show user-identity ip-of-user USERNAME) mostly doesn't show the mapping of the USERNAME and the PDI the user is logged in. The user-of-ip mapping of the PDIs IP-address shows mostly other users, which then are used to authenticate the acces thru the firewalls.
What is interesting, that on the AD Agent using "adacfg.exe cache list | find /i "USERNAME"" i can't see the PDIs IP-address neither because it is mapped to another user.Is Citrix Published Desktop environment supported to connect thru Identity based Firewalls? How AD Agent, Domain Controllers and Firewalls are working together? On the firewalls with "show user-identity ad-agent we see, the following:
-Authentication Port: udp/1645
-Accounting Port: udp/1646
-ASA Listening Port: udp/3799
Why Cisco does use 1645 and 1646 and not 1812 and 1813?The Listening Port is used for what purpose? we tried the AD Agent modes full- download and on-demand with the same effect.
View 17 Replies
View Related
Apr 15, 2013
I try to launch a LAND Attack against my firewall ASA 5520. Everything will work fine. But why, I think it should not work. I use a little tool where I can user a spoofed address, with a cluster shell and attack the firewall interface with the source of 127.0.0.1 ore the ip address of the interface as the source and destination. Then I get a cpu load of 89% with only two host. With IP tables I can use kernel processes to prevent this. But I don´t find anything for ASA.
View 1 Replies
View Related
Jan 4, 2012
Two different WAN links get connected to the firewall via two routers.(Different ip subnets).I need to get this two wan streams seperatly to the core switches.Core switches sits.Active/Stanby senario. If the Active core goes down Stndby Core will have take over the traffic. My design is correct ,if not what do i need to change. ASA is 5520.
View 8 Replies
View Related
May 22, 2013
I have ASA 5520 installed. I want to use ntp server for firewall clock setting. I found one open-access ntp server (stratum 2) in Los Angeles:
[URL] 209.151.225.100
Can I use the following command to set ntp server?
ntp server 209.151.225.100 source outside.
View 3 Replies
View Related
Jan 1, 2012
communication between 2 vlans.i have 2 vlans
Vlan 100
ip add 1.1.1.1
!
!
!
Vlan 200
ip add 2.2.2.2
i want to make communication between 2 vlans on firewall 5520 ASA 8.2.
View 1 Replies
View Related
Feb 27, 2011
I have a serious problem with my corporate firewall, witch is an ASA 5520, fv 8.3, with 8 +1 interfaces. It suddenly started to crash every 10/20 minutes and rebooting alone.
First of all I checked system resources witch are in a very low usage state. I also checked interfaces errors, but nothing strange come out o from error counters analysis. I tried disabling logging and all the service policy rules configured, but nothing changed.
Nothing changed and firewall continue restarting by itself.
Last logs I received before crash were:
%ASA-4-711004: Task ran for 35 m sec, Process = Dispatch Unit, PC = 84a619e, Call stack =
%ASA-4-711004: Task ran for 35 m sec, Process = Dispatch Unit, PC = 84a619e, Call stack = 0x084A619E 0x084A6512 0x084A70E1 0x084A7987 0x084A7AAA 0x08558B9B 0x08558E8A 0x083D3518 0x083CA145 0x080659D1 0x089196D9 0x08919790 0x089FF711 0x08A27468
Here the sh crash info command on module 0, after last reboot:
[Code] ......
View 12 Replies
View Related
Nov 29, 2011
we are having a firewall asa 5520 .we have connected the management port and inside port to internal network and dmz port to dmz network.now we need to configure tacacs and other management tool on dmz devices through management port. The problem is the management devices tacacs and other are placed in internal network.
View 2 Replies
View Related
Oct 4, 2012
I have an ASA 5520 in my company which does all our NAT and Firewall access control. Currently there is a rule in place to allow an incoming connection on port 2222 from a specific ip address to allow access to a web app our developers created. This is a test before the web app is released live. Now the web app can communicate with the specific address and port but the incoming connection on port 2222 isn't getting through. Everything looks great in the firewall but how can I log any hits this ACL takes to identify any potential problems?
View 2 Replies
View Related
Apr 8, 2011
Our Local Network is behind the CISCO ASA Firewall.Whenever we are accessing to Client VPN server,it is getting connected but after few Minutes (May be 5/10/30 Min),the sessions are terminating. The same traffic through PIX is no issue , only with ASA Firewall. See the following Error and request you give the possible root cause for this.
2011-04-09 16:15:09 Local4.Info 172.16.1.68 %ASA-6-302016: Tear down UDP connection 87447908 for OUTSIDE:68.22.26.66/4500 to inside:172.16.9.10/4410 duration 0:27:49 bytes 18653
View 1 Replies
View Related
May 29, 2012
I have problem in the configuration of Cisco ASA 5520, IOS version 8.4. The connection is as follows: LAN network--> Firewall --> Routers with GLBP with virtual ip address. the clients can not ping the virtual interface of the GLBP group, but I can ping it from the firewall, and I can ping the clients from the firewall, I checked the packet tracer it gives :
Phase: 7
Type: NAT
Subtype:
Result: DROP
Config:
nat (inside10,outside) source dynamic LAN interface
Additional Information:(code)
View 1 Replies
View Related
Oct 24, 2012
Need to know if ASA 5520 does Layer 7 firewall or not?
View 2 Replies
View Related
Jan 26, 2012
Two days ago, we changed our old 525 with asa 5520 ( ver 8.2 ). Configuration is the same, except the version. It even retains the same global interface and static public ip address as the old device.All worked well during that period.
Yesterday, one of the http applications , not tested other day, was found not to be working. To test, we switched back to the old 525 , however nothing was working when we did that.
View 5 Replies
View Related
