Cisco Firewall :: ASA Software 8.3 And 8.4 And Implicit Deny Rule In ACLs?

Aug 23, 2011

I have found this in documentation (the same statement for version 8.3 and 8.4):
 
" Access Control Implicit Deny #All access lists (except Extended access lists) have an implicit deny  statement at the end, so unless you explicitly permit traffic to pass,  it will be denied. For example, if you want to allow all users to access  a network through the ASA except for one or more particular addresses,  then you need to deny those particular addresses and then permit all  others. " 

Does it mean that now all ACLs shoud have created manualy deny ip any any rule at the end ? I have migrated one ASA to version 8.3 (no host connected and I can't test it) but after migration I don't see this rule at the end of all ACLs. Does it mean that all traffic will go throu ACLs on all interfaces ? I didn't find any information about this change in documents describing new software features [URL]

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Cisco VPN :: ASA 5510 Implicit Deny Access Rule Blocking Site-to-Site VPN?

Apr 22, 2012

I've setup a site to site vpn on an ASA 5510 using ASDM (as I have many times before) and the tunnel appears to be up but I am not able to pass traffic.  When I run the packet tracer from my inside network to the remote destination network, it shows that it is blocked by the implicit deny ip any any rule on my inside incoming access list.

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Cisco Firewall :: ASA 5505 - Cannot Add Rule Without Deleting Implicit Rule

Jan 18, 2011

what is the purpose of the "Permint all traffic to less secure networks".
 
Well I know the purpose and the technique to handle some sercurity level is nice. when I cannot add add a rule without deleting this implicit rule?
 
The technique of security level is then obsolete?

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Cisco Firewall :: ASA-4-106023 / Disable Logging Of Implicit Deny?

May 13, 2013

My syslog is full of %ASA-4-106023: Deny tcp src outside:---- by access-group "inbound-acl" messages.  I did not configure an explict deny for the access list to log these denies.how I can disable logging of denied connections?

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Cisco Firewall :: ASA 5510 Global Implicit Rule

Nov 24, 2011

I got a Global Implicit Rule problem with my Cisco ASA 5510. Here's my configuration : url...I created a PAT translation so that my web server (group LAN Network) could be accessed from the Internet.Although every rule seems to be ok, i got a "tcp deny access" when i try to telnet my public IP on port 80 (ping is ok).
 
Why is there only one Global Implicit Rule, and not one for each Interface (like in the older versions of ASA OS) ?

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Cisco Firewall :: ASA 5505 Implicit Rule Blocking Exchange 5040

Jul 23, 2011

I picked up a rather nasty bit of malware which resulted in a format and installation of Windows Ultimate 64, all well now except i cant get the wireless to work, downloaded assorted drivers from the dell support directory but to no avail, so questions are-:am i missing something obvious (windows function button for wireless does nothing)what is the correct driver for the N5040 and are there any tricks in getting it to work.

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Cisco Firewall :: Pix 506e Passing Traffic Even With A Deny Ip Any Any Rule

Sep 20, 2012

So I was doing some testing with my BB Playbook where I wanted to see what outside connections it tried to make during startup and whatnot. I have a pix 506e running 6.3(5). I created an simple 'deny ip any any' access list on the inside interface so that the Playbook doesn't actually make any connections, but I set up a 'capture' on the inside interface accepting 'ip any any' to see what kind of traffic I could see heading outbound from the Playbook. Well, it started off showing attempts to query DNS (and failed, naturally), but then after a couple of minutes, it tried to connect to a couple of IPs over port 443 and actually got a response!!! For the life of me, I can't figure out how this can happen. NO traffic should be allowed outbound due to my explicit 'deny' rule, but for some reason some traffic on port 443 made it past the firewall and got a response back. There are no other rules in the access list except the 'deny' rule. My PIX configuration is quite simple and I cannot see anything that would allow the Playbook traffic to circumvent the access list.

I've come to think that either RIM has found away around Cisco access-lists, or there is a bug in the Pix OS. I know it's an old appliance/OS, but still. I wouldn't think it could be THAT easy to bypass the firewall.

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Cisco VPN :: ASA5505 Random Destination Port And Implicit Rule

May 4, 2012

I have an ASA5505 that I am setting up behind another firewall. The external firewall has all ports forwarded to the ASA which is fine as I can see the traffic getting to the ASA in the log. However when the traffic trys to return to it's destination the ASA assigns a random port number. For example for VPN the source port is 443 but when the ASA trys to go back to the public IP addess it is using port 52857 which is obviously blocked on the external firewall. The Packet Tracer also says the the traffic is blocked by an implicit rule on the ASA which denys all ip traffic however I can't delete this rule and as I test I have created another rule allowing all IP traffic.

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Cisco Firewall :: ASA 5505 Site To Site RTP Traffic Is Hitting Deny All Rule?

Aug 13, 2012

Got an ASA5505 connected to another endpoint running IPsec and being NAT'd at each end to a 10.0.0.0/24 network. I can pass other types of traffic through the ASA 5505 but not RTP traffic. The moment it is NAT'd and hits the firewall rules it gets denied by the default deny at the bottom of the list.

Currently the rules are as follows
 
 Incoming External
allow ip any any
allow tcp any any
allow udp any any
default deny

 [code].....
 
It wont allow us to setup a voip call...however when the same call manager sets up a voip call NOT using this ipsec tunnel it works just fine.

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Cisco :: ASA 5505 Site To Site RTP Traffic Is Hitting Deny All Rule?

Aug 14, 2012

Got an ASA5505 connected to another endpoint running IPsec and being NAT'd at each end to a 10.0.0.0/24 network. I can pass other types of traffic through the ASA 5505 but not RTP traffic. The moment it is NAT'd and hits the firewall rules it gets denied by the default deny at the bottom of the list.

Currently the rules are as follows

Incoming External
allow ip any any
allow tcp any any
allow udp any any
default deny

[code]....

It wont allow us to setup a voip call...however when the same call manager sets up a voip call NOT using this ipsec tunnel it works just fine.

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Cisco Firewall :: ASA 5540 And FTP Over Implicit TLS / SSL Client

Jan 3, 2012

I am having the EXACT same problem as this user:URL
 
Error:   GnuTLS error -53: Error in the push function.
Response:   425 Can't open data connection.
Error:   Failed to retrieve directory listing
Response:   421 Connection timed out.
 
However I am using implicit instead of explicit. Here are the outputs of items that have been requested in the other thread.

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Cisco Firewall :: ASA 8.2 Getting ACLs Loss

Jan 23, 2013

I'm almost afraid to post since my stuff is so OLD! I have a 350 Series PCI Wireless LAN Adapter in my old WinXP, not wireless-ready Compaq.I live off the grid, no landlines and have been using a Franklin CDU680 USB air card to connect to the Internet. The air card doesn't like my Compaq - occasionally crashes it. I thought to put the air card in a router to solve the problem and communicate with the router using the Cisco 350. Bought a Cradle Point router from my ISP and plugged in the Franklin.  Then spent the next 5 days trying to get the Cisco 350 to associate with the router.I now have a profile with the router's SSID in it that according to the ACU's status report is associated with that SSID. Problem is that there is no Internet connection.

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Cisco Firewall :: ASA 5505 - Static NAT And ACLs

May 25, 2011

Currently a customer has all theLAN devices using a router as the Default Gateway. The router also do the Dynamic NAT to the internet access and has NAT/PAT rules to publish some services like HTTP and FTP. As I know the router will permit all the incoming traffic in all its interfaces without restrictions at less there is an ACLs that restrict the incoming traffic on an specific interface.Now the customer has bought a brand new ASA and wants to use it as the default gateway for the entiery LAN. This means, the ASA will have the internet connection and will be the responsible for the NAT/PAT process.

I have configured the NAT/PAT rules already following the current router configuration, but I need to know if I have to configure ACLs allowing the incoming traffic on th Outside interface for the services I NATed.

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Cisco Firewall :: ASA5510 Post And Pre 8.3 NAT And ACLs

Aug 30, 2012

In the near future I plan on updating all of my firewalls to 8.4, currently we're on a mix of 8.0 and 8.2. I've heard that if your equipment is on 8.2 there's an auto-conversion feature when upgrading to 8.3. However, I do not want to rely on that and am trying my hand at re-writing the NAT and ACLs myself. Attached is my pre 8.3 ASA 5510 config (santized) and a document that shows the particular sections pre 8.3 and what I think they should be after the upgrade.

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Cisco Firewall :: ASA 5510 - Multiple V LAN's And ACLs

Feb 27, 2013

I'm having a bit of trouble determining the best way to do this... I have 12 V LAN's set up (sub interfaces on a redundant group of two NICs) on my ASA 5510.  On several of these, I want them to be able to access the internet but not access other V LAN's. 

By default, they have a rule like "any to any less secure", and since the outside interface has a lower security level, this works great.  But if I create an ACL on the interface, this rule disappears.  I can restore internet access by adding an "any to any" or "(this interface's sub net) to any" rule, but this seems to imply that it allows access to any v LAN.  Do I have to create a set of "deny" rules for each V LAN, on each V LAN, followed by an any-any rule to allow internet access, or is there a cleaner approach?

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Cisco Firewall :: Configuring ACLs 3560 In A Lab

Dec 27, 2011

In my lab setup i configured Cisco 3560 switch.

VLAN 20 and VLAN 30 i configured.
VLAN 20 interface IP : 192.168.20.1/24
VLAN 30 interface IP : 192.168.30.1/24.
Inter-vlan communication is happening fine.
 
For testing for purpose i configured extended ACLs. Here is my requirement: I want to stop communication from VLAN 30 to VLAN 20 but not vice-versa.
 
Here i configured like this:
 
access-list 111 deny ip 192.168.20.0 0.0.0.255 192.168.30.0 0.0.0.255
access-list 111 permit ip any any
applied ACL in VLAN 30 interface 'in' direction.
ip access-group 111 in
 
In this scenario, communication is stopping in both directions. If i ping from one of the IP VLAN 20 to one of the ip of VLAN 30, i was gettng Requested time out. And if i ping from one of the IP VLAN 20 to VLAN 30 interface IP, i was able get pinging.
 
From VLAN 30 to VLAN 20, i was getting destination host unreachable from VLAN 30 ip( Its fine as its my requirement). So, solution needed to communicate from VLAN 20 to VLAN 30.

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Cisco Firewall :: Unable To Edit IP Based ACL Firewall Rule In RVS4000?

Apr 8, 2012

I am a novice with networks but do have a fair understanding of networks. I have a small business network, utilizing a RVS4000 router (Firmware V2.0.27)I am attempting to set up firewall rules to block certain web sites at certain times.I have successfully set up rules using source and destination ranges, to deny service 24 hours a day everyday.
 
However and here is the problem when I attempt to edit any of the rules (I want to change the time to certain hours of the day) it allows me to edit the rule but when I attempt to save I get an error message up saying there are invalid characters and it will not save the changes?create the whole thing with the changes I want it works fine, is this a known bug?

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Cisco Firewall :: ASA 5510 Deny TCP (no Connection)

May 17, 2012

My firewalls are running in multiple context mode.According to my troubleshooting, the problem happens because of the following things:
 
1- The host 10.15.5.100 do a telnet to 10.0.6.100 using the default gateway that is the context firewall C2;

2- The packet go to the C2 and is forward through the interface e0/0 (direct connected);

3- The packet is delivered direct to the host,without passthrough the context firewall C1;

4- The host receive the packet and return the answer to the source host 10.15.5.10 using the default gateway 10.0.1.10;

5- The packet is received by the context firewall C1 and is dropped with the reason Deny TCP (no connection) syn ack;
 
I think the the problem is on step 4, the context C1 receive a packet that didn't pass by it before. Am I right?

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Cisco Firewall :: ASA 5505 ACLs On Ethernet Interfaces

Aug 18, 2011

It is my understanding that ACLs can only be bound to logical interfaces using the access-group command. However, is it possible to somehow apply ACLs simply based on the ASA's local Ethernet interface? For instance, consider the following:
 
Device A with IP 192.168.1.1/24 is connected to Ethernet0/0 on the ASA. Device B with IP 192.168.1.2/24 is connected to Ethernet0/1 on the ASA.
 
Since both devices are in the same subnet and presumably the same VLAN, is it possible to manipulate the traffic to and from physical Ethernet interfaces using ACLs in this manner?
 
My predicament is fairly simple:
 
Internet --- ASA --- ROUTER
|
DMZ
 
In addition to NAT, VPN, and various other tricks, my ASA is also routing traffic from my internal LAN and the Internet to servers in the DMZ configured on the ASA. Due to a combination of Internet and DMZ traffic, my relatively slow ASA is struggling to route and thus becoming a bottleneck. My router is comparatively modest in terms of functionality when compared to the ASA but it is fast. My ideal solution would be to somehow harness the ASA's filtering capabilities for my DMZ but use the router to get traffic to and from my internal LAN into the DMZ without using the ASA to route it.
 
Additionally, it is worth noting that my DMZ is fairly restrictive so using protected or isolated ports would not quite work for me.

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Cisco Firewall :: ASA 5505 - Bypassing ACLs Online

Sep 22, 2011

I implemented an ASA5505 on an access switch on a network with a single data vlan1.  When I put the device online, none of my ACL's were being matched. 

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Cisco Firewall :: 5510 - Deny IP Due To Land Attack

Mar 27, 2011

We are getting continuously log created as below in ASA 5510. I suspect something is going wrong (like system is getting compromised ? )
 
Note: I have changed the actually public IP to 1.1.1.1 for some security cause.
 
Log..
 
Mar 18 21:46:19 124.153.100.44 Mar 18 2011 21:46:22: %ASA-2-106017: Deny IP due to Land Attack from 1.1.1.1 to 1.1.1.1Mar 18 21:46:19 124.153.100.44 Mar 18 2011 21:46:23: %ASA-2-106017: Deny IP due to Land Attack from 1.1.1.1 to 1.1.1.1Mar 18 21:46:20 124.153.100.44 Mar 18 2011 21:46:23: %ASA-2-106017: Deny IP due to Land Attack from 1.1.1.1 to 1.1.1.1Mar 18 21:46:21 124.153.100.44 Mar 18 2011 21:46:24: %ASA-2-106017: Deny IP due to Land Attack from 1.1.1.1 to 1.1.1.1(code)

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Cisco Firewall :: ASA5505 Firewall Rule Not Blocking

Apr 1, 2013

I'm trying to troubleshoot an ASA5505.
 
The original goal was to block "Mumble/Murmur" (a voip app) traffic, which runs on TCP/UDP 64738, both inbound and outbound, except to a certain host (63.223.117.170).
 
However, when nothing I tried seemed to make a difference, just to troubleshoot, I decided to try blocking all inbound traffic.  I first disconnected ethernet port 0/0 to ensure that it was cabled correctly and the outside interface went down when I did.  That worked as expected, so I confirmed I had the right interface and it was cabled correctly.
 
I then applied a "any any deny ip" rule as the first element in the outside interface access_list, as you can see below.  However, it appears to have had no real effect and the hit count is very low (it should be astronomical).
  
show ver 
Cisco Adaptive Security Appliance Software Version 9.0(2)
Device Manager Version 7.1(2) 
Compiled on Thu 21-Feb-13 13:10 by builders
System image file is "disk0:/asa902-k8.bin"

[Code].....

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Cisco Firewall :: Rv042 - Firewall Access Rule

Jun 3, 2013

I have a server behind an rv042 that i would like to block access to on one port from outside in.  I have configured the rule as follows:
 
priority = 1.  policy name<name>.  enable<checked>.  action = deny.  service <service to block>. source interface = wan1.  sources = any.  destination = <public ip address of server>.  day <nothing>. 

This does not block the intended port from outside.  I also changed the destination to be the private ip address and i changed the source interface to LAN and to *.  What is the correct syntax to do this?.  Port forwarding is enabled.  I noticed that there is one entry in the forwarding table for the public ip but it is going to a dead private ip address.  Would this have an effect? 

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Cisco Firewall :: VLANs ACLs In A 3750 Switch Stack

Jan 15, 2013

A CISCO 3750-X stack with several VLANs  and many ACLs applied to the virtual interfaces. Intervlan routing is on. Connected to this stack are VMware hosts and with about 500 VMs.We started using the ACLs to allow connectivity between VLANs to specific hosts and it has grown to thousands of lines. I personally do not think this is good for the switch and believe the switch was not intended to be used for that security feature.

- Does it make it sense to add an "internal firewall" between the CORE ROUTER AND THE 3750-X SWITCH STACK ?

- Do you recommend any other way?

- Any recommended CISCO resource/white paper to read about best practice

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Cisco Firewall :: Configuring Inside ACLs With ASDM 5.2 / ASA 5005

Sep 25, 2011

I want to restrict outgoing traffic.  Currently the deafault any, any IP allows all traffic from the inside to the outside.
 
So I created some rules to only allow HTTP and HTTPS.  First I configured a rule to allow all DNS (TCP 53) traffic out.  Then I added a rules to allow HTTP (TCP 80) and secure HTTP (TCP 443) out.
 
When I apply and try to surf out to the internet from a box on the inside network I cannot.  Remove the rules which returns the default any, any IP and traffic flows.
 
Packet tracer shows that the traffic should flow.  And I have had minor traffic flowing but slow.
 
how to only allow web surfing from the inside to outside using the ASDM (5.1) to configure?  I realize this is probably a very simple thing, but I only configure the ASA about once every year!

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Cisco Firewall :: Network Is Super Slow After Deny Tcp Log In ASA 5510

Jun 28, 2011

I used the ASA 5510 and in these days, facing the problem is internet is very slow. When i check in real-time log viewer debugging, i found the following logs 6|Jun 29 2011|15:47:53|106015|123.123.123.123|416|111.222.111.222|80|Deny TCP (no connection) from 123.123.123.123/416 to 111.222.111.222/80 flags ACK  on interface Inside 4|Jun 29 2011|15:47:53|106023|123.123.123.123|852|111.222.111.222|80|Deny tcp src Inside:123.123.123.123/852 dst Outside: 111.222.111.222/80 by access-group "Internal_access_in" [0x0, 0x0] a lot of log message are come out and I notice that 111.222.111.222 ip is try to attack my network. In that moment, my network is very slow and nearly to be down.  When I block with that ip by access list, network is up again. But after a few moment, attack from other ip, it's so terrible and so tired to block a lot of ip by acl.

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Cisco Firewall :: ASA 6.1 Deny IP Spoof From (global) To (Static NAT) On Outside Interface

Jun 2, 2013

I'm receiving an error when trying to access a web server behind from one subinterface to another subinterface on an ASA access the public IP.  I'm getting the following:
 
Global Static NAT Deny IP spoof from (61.X.X.X) to 201.X.X.X on interface Outside     
 
Traffic dies at the firewall stating that the traffic is spoofed from the Global address (61.) to the static (201.) address.  Both bound to the outside interface. When I create a static NAT on the firewall there is no problem; however when I'm patting against the firewall to the public IP I get the denies. 

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Cisco Firewall :: ASA 5520 / Deny IP Spoof On Interface Inside

Jun 17, 2012

I'm trying to attach tacacs server (ACS Version 5.2) in server group on ASA 5520 (Version 8.4). When I test connection in ASDM (Version 6.4) between ASA and ACS it fails. The log message on ASA is:
 
%ASA-2-106016: Deny IP spoof from (10.8.27.126) to 10.8.48.10 on interface inside.
 
Packet-tracer from ASA is:
 
InternetASA# packet-tracer input inside tcp 10.8.27.126 4444 10.8.48.10 49
 Phase: 1
Type: CAPTURE
Subtype:
Result: ALLOW
Config:
Additional Information:
MAC Access list

[code]....
 
What access-list or implicit rule may be the reason of denying these packets?

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Cisco Firewall :: ASA 5505 Configured ACLs / NAT / No Longer Makes Directions

Aug 28, 2011

I have an ASA 5505, firmware 7.2 (4). Configured ACLs, NAT, it's all working, but after a while it seems that running crashes, no longer makes the directions of NATs, the logs until they stop working. To resolve, I have to restart the ASA, and everything will work again.

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D-Link DIR-615 :: The Rule Is Being Used By Another Rule And Cannot Be Deleted

Jul 27, 2011

I accidentally setup two schedule rules both with the name of "Log". When I highlight either rule, and try to delete either, I get error "The rule is being used by another rule and cannot be deleted"  How do I delete?

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Cisco Firewall :: ASA 5510 / 4GE SSM - FP L2 Rule Drop

Nov 10, 2011

ASA 5510 running without issues for a while but we needed extra port so added a 4GE SSM.
 
Having installed the 4GE SSM we had some issues with the card not liking a connection to our switches and only working by plugging directly from the server into the firewall, not great as we wanted extra servers on the line in the future.  So we upgraded the firmware and no are at an impasse.
 
We have upgraded to 8.0(4)3 and now we cannot get any traffic through the port, we can't even connect to an external DNS server.  Running a packet trace I get an immediate error on the first step '(l2_acl) FP L2 rule drop', and it appears as though the outside connection is down.
 
I have some experience on setting up basic port forwarding and NAT for internet access, webservers, mail but this has thrown me. 

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Cisco Firewall :: ASA 5505 - Creating NAT Rule

Mar 7, 2012

Our external security department needs to scan, every three months, a computer behind the firewall. I need to create a simple NAT rule that will allow an ip address or subnet to the computers behind the ASA 5505. At the moment, we have a simple NAT rule which allow all network traffic to exit from inside to outside.

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Cisco Firewall :: ASA 5505 - Adding New Rule For Network?

Mar 30, 2011

I have an asa 5505 and I would like to adding a new rule for a network, however it was added, it seems it would be inactive. I have two inside network,192.168.12.0/24 (name: lanA) and 192.168.99.0/24. (name: lanB) I have the following in the running-config:
 
access-list lanB_acl line 1 extended permit ip 192.168.99.0 255.255.255.0 any
access-group lanB_acl in interface lanB_interface
  
But when I tried to reach a host in the lanA, the packets are dropped. I configure the asdm, which shows this on the LanB interface:

1 lanB_network | any | ip | permit (hits 344)
2 any | any | ip | deny
 
 and I checked the packet tracer with: tcp, source: 192.168.99.57:10460 dest: 192.168.12.2:443 and it shows that the packet has been dropped by the last 2. 'implicit any any ip deny' rule, in spite of my access-list rule (access-list lanB_acl line 1 extended permit ip 192.168.99.0 255.255.255.0 any) preceded it, and active.
 
The lanB and lanA interfaces are the same security level 100, and I can reach the outside/internet from 192.168.99.57 Is it possible that I have to reload the rules or something like in order to apply? Or I missconfigured something?

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