Cisco Firewall :: ASA 5505 Inbound TCP Connection Denied
Oct 6, 2011
I configured an ASA 5505 a couple of weeks ago. Every thing is working properly except it sends irritating messages to the syslog server. Her is an example of the message:
%ASA-2-106001: Inbound TCP connection denied from 195.215.221.56/80 to 10.70.13.90/252 flags PSH ACK on interface outside
%ASA-2-106001: Inbound TCP connection denied from 195.215.221.56/80 to 10.70.13.90/2252 flags ACK on interface outside.
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Jun 24, 2012
I have 2 cisco routers that resired on the same interface on Cisco ASA. For security reasons, on both of the routers I have configured default gateway to be ASA interface, then static route between them on the ASA, I get the following error when on station comming from first router trying to connect to another station behind secound router (again, on the same interface, maybe this is the issue?).
ASA-3-106001: Inbound TCP connection denied from flags SYN
There is access list allowing traffic between but hit count is 0
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Feb 19, 2012
I have a website that is hosted by our company, but when the staff goes to the outside address of th website it gets denied by ACL thus page not found.
3Feb 20 201211:25:23192.168.3.5752928our Extrenal IP80TCP access denied by ACL from 192.168.3.57/52928 to inside: our External IP/80,OUr external ip is also the ip of the 5505.
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Apr 28, 2011
Connection denied due to NAT reverse path failure
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May 31, 2011
Last night I switched out our old Cisco pix 515 with a asa 5505. The config is the same and internet and outgoing mail is working but no mail is coming in. Below is a copy of my config. Why my inbound mail is not coming in.
smtp 192.168.51.248 (Barracuda email filter)pop3 192.168.50.11 (exchange server). Tried to telnet into the firewall but connection timed out. Went to mxtool box and that also timed out while trying to connect to smtp. Port scan from mxtool box timed out too on all ports.
[Code] ........
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May 12, 2011
how to set up port forwarding for inbound SSH?
The outside interface on the ASA is on DHCP. I have a single dynamic public IP from my ISP. The inside interface provides Internet access for the network using NAT.
I have a server on the internal network with an IP of 192.168.0.6 and I would like to access this via SSH (TCP port 22) from outside.
I've been able to do this in the past on a PIX with a static public IP block, but I'm new to ASA and I don't know how to do it with PAT.
Current running config attached for what it's worth, but it's pretty basic at the moment.
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Nov 22, 2012
I have upgraded an ASA 5505 to 9.0(1) as I would like to use ipv6 version of dhcprelay. That said, I am unable to obtain a global unicast address but the link-local address is able to communication with the ISP's gateway/DHCP provider which I hope will allow v6 dhcprelay provide internal clients with IP's from the ISP. Trouble is, unsolicated inbound ICMPv6 messages from the ISP's gateway are being dropped on the way into outside interface.
%ASA-3-313008: Denied IPv6-ICMP type=129, code=0 from fe80::201:5cff:fe3b:3c41 on interface outside
%ASA-3-313008: Denied IPv6-ICMP type=131, code=0 from fe80::201:5cff:fe3b:3c41 on interface outside
%ASA-3-313008: Denied IPv6-ICMP type=131, code=0 from fe80::201:5cff:fe3b:3c41 on interface outside
[Code]...
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Apr 25, 2012
Trying a simple Easy VPN connection and getting the following in the error logs:
Built inbound UDP connection 684 for outside:xx.xx.xx.xx/1106 (xx.xx.xx.xx/1106) to identity:xx.xx.xx.xx/500 (xx.xx.xx.xx/500)
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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.
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Jul 29, 2012
I am currently configuring a Cisco 881 router and am having some vpn connection issues:I can connect with one user (me) and all other connection attempts form other users are denied. When I disconnect, other users can connect - the scenario is that only one user can connect at any given time.
Here is my config:
Building configuration...
Current configuration : 11423 bytes
!
! Last configuration change at 13:11:23 PCTime Fri Jul 27 2012 by zephyr1
! NVRAM config last updated at 13:25:30 PCTime Fri Jul 27 2012 by zephyr1
!
version 15.0
[code]....
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Jan 1, 2012
I consider the NAT mechanism to be quite straight forward, but although the firewall ACLs allow the traffic, it is being denied. The ASDM log and packet-tracer indicate the problem being an ACL.
# the internal resource
object network mabe-mbp
host 10.0.0.36
!
# these are ALL of the rules on the outside/inside interfaces
access-list outside_access_in extended permit tcp host 1.2.3.90 any eq 12380 log disabled
access-list outside_access_out extended permit ip any any log
access-list inside_access_in extended permit ip any any log
access-list inside_access_out extended permit ip any any log (code)
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Dec 18, 2011
We're getting "Connaction Timeout / Connection Failure" error messages several time per day. Here is our setup:
Verizon FiOS Internet (ONT Box) --> Cisco ASA 5505 --> EdgeMarc 4500 Router --> Cisco 300-24G Switch --> Dell PE1950 Servers
From past few months, we keep getting Connection Timeout and Connection Failure error messages in our vendor application which connects to SQL Server 2005. Also Terminal Server 2003 keep disconnecting for every few hours.After several days of troubleshooting, we come to know that this Cisco ASA 5500 is not working properly. When I access the ASDM, it shows several warning messages.I know there is a setting option to configure TimeOut, but is there anyway to test and track the ASA 5500 regarding this Timeout issues?
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Jan 14, 2013
I'm having problem getting ICMP echo monitoring on outside interface to work. I've set: icmp permit host monitoring_station_adress outside but I still get:
%ASA-3-313001: Denied ICMP type=8, code=0 from monitoring_station_adress on interface outside. I'm trying to directly monitor ip on ASAs interface outside.
I have access-group tied to "in" direction on interface outside. Do I still have to put "permit icmp" rules despite the fact that icmp permit outside command is set?
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May 6, 2012
I have ASA5505 configured with internal network as 192.168.15.0 and default gateway 192.168.15.1 From the inside network, i'm able to access internet and able to ping all website (enabled ping). and all internel network devices can ping each other. Except i cannot ping my gateway (ASA5505) 192.168.15.1. I'm continously seeing this message on the log, when i tried to ping.. How to fix this?
Denied ICMP type=8, code=0 from 192.168.15.xxx on interface inside
replace xxx with my network devices that try to ping the gateway..I dont want outsiders ping my gateway, i need ping for inside internal network only.
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May 28, 2013
I am attempting to allow traffic from one vlan to another.Vlan 1 is on Interface 0/2.vlan1Vlan 2 is on int 0/3.vlan2Each vlan can communicate inside it's own vlan, and the gateway on each responds to vlan specific clients My problem is that I am unable to communicate between the two vlans. Using the ASDM packet tracer tool, I find that packets are denied by the default rule (on the second Access List lookup). It appears as if the packet never reaches the other interface. The access rules are set up to allow traffic from one vlan to another (inbound), on both interfaces. Testing from either vlan to connect to the other fails. Below are the accee-rules for each vlans. Once I get basic connectivity working.
access-list aVlan1; 3 elements; name hash: 0xadecbc34
access-list aVlan1 line 1 extended permit ip any 192.168.151.64 255.255.255.192 (hitcnt=0) 0xeb0a6bb8
access-list aVlan1 line 2 extended permit ip any 192.168.151.128 255.255.255.128 (hitcnt=0) 0x3a7dfade
access-list aVlan1 line 3 extended permit ip any 192.168.151.0 255.255.255.0 (hitcnt=0) 0x93302455
access-list aVlan2_access_in; 3 elements; name hash: 0x6dc9adc7
access-list aVlan2_access_in line 1 extended permit ip 192.168.151.64 255.255.255.192 192.168.150.0 255.255.255.240 (hitcnt=0) 0x054508b7
access-list aVlan2_access_in line 2 extended permit ip 192.168.151.128 255.255.255.128 192.168.150.0 255.255.255.240 (hitcnt=0) 0xc125c41e
access-list aVlan2_access_in line 3 extended permit ip host 192.168.151.3 192.168.150.0 255.255.255.240 (hitcnt=0) 0x4adc114c
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Mar 16, 2013
I am trying to troubleshoot a problem where in one of my remote site is not able to access some networks at HQ over Site to SIte VPN ( asa 5505 at Remote and 5520 at HQ). I ran packet tracer and HQ ASA looks clean as everything came out as ALLOW. Remote site ASA packet tracer give me DROP out at Phase 9 (VPN). I am not very sure what to look in ASA for resolution now. Is it an access list that is blocking the traffice or VPN setup.
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Apr 9, 2012
I have a customer with a Cisco ASA 5510 firewall, an inside network containing a Genetec video recording server, and cameras installed on broadband modems throughout the area (each with a public IP). They've recently purchased Axis Q6034-E cameras that use H.264 to stream back to the video recording server. The camera has a view mode where you can watch it through H.264 or Motion JPEG. The view with M-JPEG works, but when I switch to H.264 the video stream is denied. We have allowed RTSP, RTP, and HTTP (it's setup with only http, not 443)traffic from the camera address on the cable company public network but are still being denied the video stream. The recording software requires that the feed come from the H.264 feed, so the motion jpeg does not fix the underlying issue of being able to record.
We know it's the firewall because if we install the camera on the inside network, the video feed in H.264 works to the recorder.
How to enable something special on the firewall to allow traffic through from the device?
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Jul 4, 2012
I am trying to lock down the VPN access on my Cisco 5520 ASA's whereby I wish not to allow users to SSH access etc on servers running on the same interface that they are VPNing into.
I did not originally configure the ASA and so I am slightly confused by some config on it. Currently when I attempt to PING a server within the same interface as the VPN network I get the following error in the logs below.
5 Jul 05 2012 09:45:15 305013 monitoringsystem Asymmetric NAT rules matched for forward and reverse flows; Connection for icmp src dmzAHdata:VPN IP dst AHdata:monitoringsystem (type 8, code 0) denied due to NAT reverse path failure
As a workaround I created a NAT exempt rule which then allowed traffic to the server in question however I wish to limit the traffic to only ICMP and when I do this in the firewall it does not take affect. Is this because of the NAT exempt rule?
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Aug 6, 2012
I am trying to setup an inbound NAT on an ASA5510 running 8.4 code.
object network obj-192.168.1.2
host 192.168.1.2 (internal web server)
object network NAT-external IP
host ** external IP **
object network NAT-external IP
nat (outside,inside) static 192.168.1.2 service tcp https https
access-list outside_access_in extended permit tcp any host 10.2.0.10 eq https
This seems to be setup now?
sh nat
2 (outside) to (inside) source static NAT-*.*.*.* 192.168.1.2 service tcp https https
translate_hits = 0, untranslate_hits = 0
sh access-l
access-list outside_access_in line 2 extended permit tcp any host 192.168.1.2 eq https (hitcnt=27) 0x59383a04
When I try to connect to the external IP using https I get hits on the access list, however the nat translate hits do not go up?Do I need to allow the 192.168.1.2 server back out again?
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Dec 29, 2011
I am trying to configure my ASA5505 to allow SMTP relay and the ACLStatic I created is not working.
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Oct 30, 2012
I have setup an ASA5505 running 8.2 with dual ISP's
Primary link is the current live static route out and the backup picks up if the primary fails. That all works great However I have an issue with inbound NAT rules
I have configured an inbound static on the primary which works great
static (inside,primary) *.*.*.* 10.1.1.1 netmask 255.255.255.255 access-list outside_access_in line 2 extended permit tcp any host *.*.*.* eq 3389 (hitcnt=4)
Question? With the primary link active and the default route pointing out through the primary, am I able to configure an inbound NAT to the same inside host 10.1.1.1
on the backup link?
If the primary fails users will need to be able to connect inbound to this service
When I try to set it up I got this error ERROR: Static PAT using the interface requires the use of the 'interface' keyword instead of the interface IP address
So I tried that and got this error WARNING: All traffic destined to the IP address of the backup interface is being redirected. WARNING: Users will not be able to access any service enabled on the backup interface.
So what is the best practice for configuring inbound NAT for a dual ISP configured ASA
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Apr 20, 2013
I have a 2621 router - old. but works well.Need to put in an ACL to limit the inbound SMTP traffic to be FROM a specific set of IP's, and deny all others.
I have tried various combinations with no luck. Something obvious, I am sure.
When I do a show access lists 160 it shows all SMTP traffic being snagged by the SMTP deny statement. All other traffic works correctly.
Here is my config so far...
Current configuration : 3093 bytes!version 12.2no service single-slot-reload-enableservice timestamps debug uptimeservice timestamps log uptimeno service password-encryption!hostname xxxxxxxxxx!logging rate-limit console 10 except errorsenable secret 5 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx!ip subnet-
[Code] ....
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Feb 13, 2012
I have the asa 5505 with asdm 6.4(5). my inside LAN is 192.168.0.0/24. the outside of asa is connected on lan 10.13.74.0/24 and i need over LAN 10.13.74.0/24 connect on LAN 10.15.100.0/24. i put nat rule on asa 5505 and acl rule and users from lan 10.15.100.0/24 can connect on my server, but i can't connect on from inside of asa connect on lan 10.15.100.0/24 and 10.13.74.0/24. my configuration asa is Result of the command:
"show running-config"
: Saved
:
ASA Version 8.4(2)
!
host name Cisco asa
enable password 8Ry2YjIyt7RRXU24 encrypted
password 2KFQnbNIdI.2KYOU encrypted
names
[ code]....
what i do that connect on LAN 10.15.100.0/24. i cant ping my outside interface, put rules on acl, i enabled service policy rule for icmp ,but nothing.
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Jan 30, 2012
I know I can use the RTR statement to determine when the primary ISP circuit goes down via this technote: url...My question can I assign static Nats on the backup ISP connection to the same inside servers in the dmz.?Example 10.1.1.11 is mapped to ISP1 ExternaIP of 65.217.77.11. Can it 10.1.1.11 also be mapped to ISP2's 208.217.77.11?This way I can get my DNS changed and my inbound traffic to servers in my DMZ on the asa 5510 running 8.0.3 code can continue to receive Inbound traffic.
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Jun 1, 2011
I have ASA 5510 and public FTP server from my local network to external IP address, with static nat translation. All works, but I need request to ftp come from internal ASA interface (need use gateway different ASA). How configured ASA for forwarding request?
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Feb 26, 2012
I have been asked to create an inbound connection on the ASA from the internet to a part of the network that is accessible over the Wide area network eg
-Internet address 94.175.x.100 goes to 151.5.3.100,
-The internal network is 10.42.15.0/22, and connects to the 151.5.3.0/24 network over a private MPLS.
Is this possible with the ASA5510 and if so can you give me a clue how to pass the traffic
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Nov 7, 2012
I have an ASA5510 with 8.3 and a Cisco PIX525 (retiring). The ASA was for VPN traffic only while the PIX was for all other Internet traffic. I'm trying to move all the traffic to the ASA5510 so I used the PIX to ASA migration tool. I migrated the PIX rules over to the ASA5510, however we can't receive email and there is no external access to our internal websites. But the VPN connections remain intact and internal users can get out to the internet.
When I run Packet Tracer on my outside (incoming rules) the packets are dropped at the inside interface. What am I missing?
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Dec 18, 2011
I have successfully been able to allow outbound access from inbound hosts on the appliance; however, I have only one outbound IP address and had to configure outbound access using static PAT. What I need to do is to configure access to certain inbound hosts from outside. What's wrong with my running config? Below are the commands that I believe need to be changed from the configuration. [code]
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Nov 20, 2011
I'm running a Cisco ASA 5510 with version 7.2(3) and I've been tasked with permitting some inbound & outbound TCP & UDP ports to/from a specified address space on the internet.
In looking at my current ASA config I see other access lists already configured so I'm assuming I can just set up a new access list in similar fashion, but I wanted to verify here first.
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Feb 15, 2011
We recently got a 10 meg dedicated internet fiber connection installed. I connected it to a PIX 501 firewall and everything worked fine (I tested it for a couple of weeks). A couple of days ago I got a new ASA 5505 and replaced the PIX with this device. It works, but every so often there seems to be a timeout when surfing the web whereby I click on a link and there is up to a 45 second wait and then the page loads quickly. I was not getting this before on the PIX so I'm assuming it's not a latency issue with the connection. I am the only one using this connection on the network so it's not to say that it's being bogged down. I want to roll this out to the other users on the network but not when this is happening. The configuration is below:
: Saved
:
ASA Version 8.2(1)
!
hostname ciscoasa
[Code].....
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Apr 15, 2013
I have a SIP trunk in my Florida office connected to a Cisco 2851 ISR. I'm using Unified Communications Manager 8.0 and life is great.
We just opened a new office in Spain and now the fun begins. We created a site-to-site VPN tunnel using ASA 5510 in Florida and ASA 5505 in Spain. We can register IP Commuicator phones in Spain but when they make calls it shows up as a Florida call. We need it to show up as a Spain call.
We are thinking to get a SIP trunk into the Spain office but I only have a ASA 5505 over there. Can I terminate a SIP connection to it? Is this the best option? If not, what is the recommened setup?
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Nov 13, 2012
I am having a problem with a ASA 5505. The users on the inside cannot access internet for the most of the time. When i looked over the configuration and tried a few changes i got out to internet about 5 seconds every 30 minute or so. Very strange. When i try to access internet i just get the windows post that DNS is not working properly. As you can see in my config i get all addresses dynamic from ISP.
I am not sure what to do next, i tried to set static routes, make Nat changes, static dns addresses, searching this forum but nothing works. It seems like there is a ISP problem but i have talked to the support twice today and they say that all is fine from their side. Does ASA behave like this?
ASA Version 8.2(2)
hostname ciscoasa
domain-name
enable password encrypted
passwd encrypted
names
[code]...
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Jun 23, 2012
I have a Cisco ASA 5505 - 50 VPN edition. I have baffling network issues that I have not been able to pinpoint and I recently started to think it may have something to do with my ASA. I'm a network administrator and I have a Cisco ASA 5505 in my home network so I can learn how to manage Cisco ASA's and utilize the Easy VPN feature so I have a always on VPN connection into work to log into servers, etc. I've been using the ASA for almost 6 months with the EasyVPN feature with no issues. My ISP is Comcast.
Within the last week my connections have been randomly dropping for about 20 seconds and then reconnecting. I have two computers on the network that have a direct ethernet run to the switch ports on the back of the ASA. When the connection drops, I see my LAN icons completely lose connectively (yellow exclamation warning) then after 20 seconds, reconnect. This is very random. I was able to get it to happen every time I connected to XBOX live and play a online game. It would almost on cue drop after 30 minutes of online gamming. Here are the steps I have taken:
1. Replaced 10/100 switch to a brand new 10/100/1000 switch from computer run in my office to the ASA.
no joy
2. I upgraded the ASA to the most recent firmware: ASA Version 8.4, ASDM Version 6.4
no joy
3. I had an ethernet run under my carpet to the office, I started to think that maybe one of the cables had an issue after walking on it and vacumming causing a short. I removed all the ethernet under the carpet and installed power line over ethernet adapter from the ASA to my office.
no joy
4. I checked both computers on the network for viruses. All computers came back clean after scanning wth Malwarebytes and SuperAntispyware.
5. I've watched the logs on the ASA as the LAN connection drops and I don't see error messages to troubleshoot this issue.
The only thing left to replace is the Comcast modem or the Cisco ASA. The Comcast modem is newer and only about 1 year old (rented from Comcast). Since my actual LAN connection drops and I lose connectively I believe there may be some issue with the ASA or the ASA switch ports or some sort of internal hardware issue on the ASA.
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