Cisco Firewall :: SA520 Blocking Incoming Calls?

Nov 8, 2012

I have an SA520 that is being used as a front end firewall.  Behind it I have an IP PBX.  The VOIP provides are registered and I can make outgoing calls.  However It appears that the SA520 is either blocking or not routing the calls.  I have opened the ports recommended by both the IP PBX and the VOIP provider.  What do I need to do to make incoming calls through the SA520?                 

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Cisco Routers :: RV042 Hardware V 1.2 Firewall Is Blocking Some Incoming Mail

Dec 4, 2011

I'm having an issue where our RV042 router is blocking some of our customers from sending us e-mails.I noticed thatCISCO has produced a newer version of the RVO42 V3.0 and has firmware version 4.x. can you upgrade the Linksys RV042 Hardware V 1.2 to the 4.x firmware? I have found a few articles and forums online about otherpeople having the same issue with the RV042 v1 randomly blocking, e-mail but no one ever has a solution to correct the issue.Some people have recommend to roll back to factory default and reconfigure the router as the config may by corrupt.

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Cisco Routers :: RVS4000 Firewall Is Blocking Incoming Data To Ephemeral Ports

Apr 23, 2012

If I have the IP ACL firewall enabled in my RVS4000 I have trouble connecting to specific websites and also connecting to Apple's update servers.  The problem appears to be that the firewall is blocking incoming data to the ephemeral ports even when they are allowed in the firewall rules.  I've also tried port forwarding rules but the only thing that resolves the problem is to disable the firewall entirely, which is not the desired resolution.  The firmware version is 2.0.27. 

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Way To Block Incoming Calls

Mar 16, 2012

I start to use the CM. I received a request to block a number,I need to block the call only on the Call Manager or also on the Gateway that I have?

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Cisco Routers :: Wag120n How ADSL Modem Handle Incoming Sip Calls

Feb 14, 2013

I have a Cisco wag120n adsl modem. I am setup with a SIP provider, so all my incoming and outgoing calls use SIP.So my question is, how does my ADSL modem handle incoming SIP calls,e.g the SIP call comes in and reaches my adsl modem. Then, how does the modem find the actual port that has my ATA adaptor (analog phone) or CME router attached  ? I know port forwarding would handle this, but I am not actually using any configured port forwarding rules.

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Cisco Routers :: SRP500 Series - Answer Incoming Calls On Any FXS Port

Jul 1, 2012

I'm using a SRP521W-U. I've set up a SIP account on Line 1. I would like to be able to answer incoming calls on both FXS1 and FXS2. How do I achieve that both ports will ring?

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Cisco Routers :: SA520 Optional WAN Blocking ISP

Mar 20, 2012

I have a fibre connection on the dedicated WAN which was working perfect until someone somewhere cut through the line. The SA520 fell over to the Optional WAN port which is basic ADSL line which is connected. Logmein client is online too.
But it refuses to browse webpages, appears to be a dns issue or firewall or both.
I have added the ISP dns addresses into the forwarders on my server.

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Cisco Firewall :: PIX Firewall 525 On Voice Network For 5000 CC Calls

Jul 10, 2012

can some one suggest me will it be recommended to use PIX firewall 525 on Voice ( sip ) network for 5000 CC to 1000 CC calls in signaling mode since our server are using public IP so will i be able to use it without NAT / PAT also will there be any issue of QOS.

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Cisco Firewall :: Going From PIX 501 To SA520

Jun 22, 2011

How do you convert a pix501 configuration to use on a sa520?  I do not know how to use a GUI, I am a cli guy.  Can a pix501 config be used on a sa520?

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Cisco Firewall :: Public IP Addresses On DMZ (SA520)

Feb 29, 2012

I just bought an SA520 to replace my existing FW.
The thing is that I have private IP adresses on my LAN, and I have been issued a public IP network for my DMZ by my ISP.
Meaning I want to NAT my LAN but not my DMZ, but I can't seem to find a way in the 520 to do that. I can only find the oprion to turn off NAT all together.

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Cisco Firewall :: Netgear FVX538 - Multiple Subnets On SA520

Jan 5, 2012

I am new to Cisco products. We have currently got a Netgear FVX538 running in front of a few servers. We currently have 2 ranges of IP addresses provided to us on 2 separate subnets. We configured the netgear box with the first IP addresses of each subnet as the IP address of each of the primary and secondary LANs. This then allowed us to set the gateway addresses of servers on the network to either of those 2 addresses, depending on it's range.
This all worked fine - except for the fact that the Netgear box is incredibly flakey, so we decided to get a Cisco box.
We have gone for the SA520, which I have been trying to configure this afternoon. Unfortunately I am now having concerns as to whether it is possible to configure 2 separate subnets internally on this box in the same way we have done with the netgear box. ie - classical routing, one incoming WAN interface with multiple subnets?

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Cisco Firewall :: No Outgoing Calls To Outside After ASA5505 Installation

Dec 6, 2012

Have a asterix PBX running my system and I upgraded my security with a cisco ASA 5505. Now all the extensions are working including the remote once. Everything elase like internet.Other servers all working fine. Only problem is that when ever someone dials a landline number from an extension it does not go through.seems like the firewall is blocking it but I cannot figure out why or how. All the NAT and Access list is fine. Although I have no idea how to accept the SIP PROXY IP through the firewall and I am guessing that might be the problem.  There is no any other problem and I am 100% satisfied with the ASA5505 except this problem

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Cisco Firewall :: Polycom HDX 7000 - Video Calls Through FWSM Ring But Cannot Answer

Dec 26, 2010

Running FWSM Firewall Version 3.1(4)
The problem is that calls originating from the outside of the firewall to the inside will ring but you cannot answer. The internal video conference server is a Polycom HDX 7000. There are ANY/ANY rules to/from this server and the default application inspection policy is set for h323/ras/h225 as follows:

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Cisco Firewall :: ASA5550 Way To Block Incoming Connections From TOR

Nov 29, 2012

I need to block 4000 nodes (Ultrasurf, TOR exit nodes) and I've written a script that will ssh and copy in these objects (prob 100 at a time) into an object group and then put a blanket deny.  I don't see a flood of traffic (occassional hits every other day, etc) but I was wondering what the impact would be?  Can the ASA handle an object group of that size plus an ACL with it?  Any way to block incoming connections from TOR/Ultrasurf?

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Cisco Firewall :: How To Log Incoming Traffic (SMTP) On PIX 515E

Mar 6, 2013

I'm new to ASA's and PIX units. I've setup a few VPN's now but know next to nothing about logging on these units. I read the config guide for the PIX, but cannot figure out how to get a log of incoming SMTP traffic going on the console.Do I need to use a SYSLOG server? I can probably set one up on my laptop.

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Cisco Firewall :: ASA 5505 Not Allowing Incoming Traffic

Mar 15, 2012

I am trying to switch out a cisco pix 501 firewall with a cisco ASA 5505 firewall.  I am not very familiar with all of the commands for the firewalls and have always relied on a standard command line script that I use when building a new one.  Unfortunately, my script is not working with the 5505.  What I am doing wrong with the following script?  I've masked public IP info with and I run it right after restoring the firewall to the factory defaults.  I am able to get out to the internet if I browse directly from one of the servers, but cannot access a web page when trying to browse to it from an outside network. [code]

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Cisco Firewall :: ASA 5520 Cannot Block Incoming Traffic

Dec 12, 2012

I was configure 3 interface on ASA1st - managemetn (only for management)2nd - gig0/0 is connected to internet with real IP3rd - gig0/1 is connected to local networkI was configure routed NAT to internet.But I have problem with restriction incomming traffic to inside interface (ifname is inside)but I can connect to ip address of inside interface from other ip. It is wrong and i can't understand where is my mistake.

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Cisco Firewall :: ASA5510 Permit Incoming Connection From Remote LAN

Sep 4, 2011

Actually all service from site to site is permitted, without restriction.I want to insert an ASA to block some internet traffic on main site.I try to configure my ASA5510.No problem for outgoing connection or to permit a single service on main site.But impossible to give access to all service/connection from all remote site to main site. [code]

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Cisco Firewall :: ASA 5505 Doesn't Forward Incoming Connection To LAN

Jun 13, 2012

I just got a Cisco asa 5505 with the next OS and ASDM info ASA 5505 OS 8.4(3) ASDM 6.47 I configured and enter all rules to allow incoming traffic to LAN but it's not working also, I have one host inside that is configured in a second IP and create the rule to allow traffic to it but it doesn't work too.

Problem 1 I have VNC running in port 5900 tcp and I want to connect from Internet using port 6001 and this has to forware the connection to the real VNC port. In the configuration I have a few host with the same configuration but I use different outside port to get it.
Problem 2. I have a second IP with services: SMTP, HTTP, HTTPS and port 444 all TCP forwarding to a server in the LAN.
Facts: SMTP. Every time that I do telnet to the second IP looking for the SMTP port, the firewall doesn't let the incoming connection goes through and the LOGGING screen doesn't how that connection.PORT 6001 (outside)this port is configured to work with the IP in the outside internface and it was to send the incoming connection to a host inside to the real port 5900.Can any one check my configuration if I'm missing anything? for sure I'm but I didn't find it. Bellow is the configuration, I masked the Public IPs just left the last number in the IP, also I left the LAN network to see better the configuration.
: Saved
ASA Version 8.4(3)
hostname saturn1
enable password SOMEPASS encrypted


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Cisco Firewall :: ASA 5510 - Find The Receiving End Of Incoming Traffic?

Jul 3, 2012

We run a Cisco ASA 5510 and i need to find out how i can find the receving end on the inside of a vlan for traffic comming from outside.
ie incomming traffic on port 3937 and are NAT to eth 0/1.10
Thers a bunch of traffic on one port 33771 udp going in on how do i trace this to the inside computer ???
lets say incomming traffic is on and this is on eth0/0 this ip is NAT to a Vlan on the side for with a subnet of

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Cisco Firewall :: ASA 5505 - Discarded Incoming Packets On Internal-Data0/1

Apr 4, 2013

How to best troubleshoot some errors I'm seeing on the internal interfaces of my ASA 5505. This is similar to the question at [URL], but the details are different enough that I felt it justified a new discussion.
I have an ASA 5505, running version 8.2(2), 256MB RAM. From time to time (on the order of once a week) our monitoring alerts us that both Internal-Data0/0 and Internal-Data0/1 are experiencing an unusual amount of inbound packets which were discarded with errors, up to 2.3 per second as of this post. Here is what I hope relevant output from my device:
asa# show interface ip brief
Interface                  IP-Address      OK? Method Status                Protocol
Internal-Data0/0           unassigned      YES unset  up                    up
Internal-Data0/1           unassigned      YES unset  up                    up
Vlan1                      10.x.x.x     YES CONFIG up                    up
Vlan2                YES CONFIG up                    up


1. My understanding is that Internal-Data0/0 is an internal bus that connects to modules like the 4GE. I don't have any modules installed at all, as you can tell. Therefore, what is this bus doing?
2. For that matter, what is Internal-Data0/1 doing? What does it connect to?
3. I'm guessing that due to the input errors and overruns reported for both of these interfaces, it's a buffering issue. Since these are input errors, does this mean that traffic destined to this bus for forwarding is being dropped because the bus itself is running out of buffer memory? How would I see (and subsequently monitor) the buffer memory for these interfaces? Once I am able to see it, what sort of tools can I use to determine what is causing this?

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Cisco Firewall :: ASA 5510 Stops Forwarding Incoming Traffic To Internal Servers?

Dec 5, 2012

Since the power failure two days ago, my -ASA stops forwarding traffic to internal servers, for no apparent reason. Packet trace shows all OK, packet capture buffer stays empty when I try to http into the mail server. The only way to get it working is to change the Outside Ip to the one used for mail, then to change it back. It will work OK for a few hours, then stop, with nothing obvious in the logs.

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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 (
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"


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Cisco Firewall :: ASA 5520 / Monitor Largest Outgoing And Incoming Traffic Per Ip In Real Time?

Mar 4, 2013

We have a Cisco ASA 5520 and im looking for a way to monitor largest outgoing and incoming traffic per ip in real time so to know which of my internal computers are using the most of our Internet Line. Is there a way to this through ADSM ? We use version 6.3.

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Cisco Firewall :: URL Blocking Through ASA 5510 Without ISA

May 10, 2011

I have cisco ASA 5510 with ios version 7.07 & all users are browsing the internet via PAT through ASA. i want to block some sites/URLs like facebook, yahoo etc.

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Cisco :: Firewall Blocking Users From Connecting From Outside?

Oct 5, 2012

I set up a cisco 2811 to replace a netgear router at the office. I have nat set up and with ccp I added a firewall on the router using the basic firewall wizard. Just about everything works internet, receiving and sending emails on exchange from the pc. Issue I'm having noone can access the company email on their phone.Also theres a camera system that would be accessible to view from the live feed from outside the office and my boss can't access the camera. I port mapped all the custom applications and added new traffic rule from self -> outzone. It didn't work tried to add one from outzone -> self or inzone but i get a prompt stating it only accepts protocols tcp,udp, sip, h323, icmp and a few other I can't think of. I'm pulling out my hair trying to get this to work everything worked seamlessly on the netgear router and nothing was really defined just the inbound ip address of the applications and protocols that are allowed.

Lets say for reference purposes my ip addresses for internet is

internet /24
email server /24
web cam application /24
8000 in
8001 out

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Cisco Firewall :: ASA5505 URL Filtering / Blocking?

Jul 7, 2012

I have ASA 5505 running 7.2.4, I want to prevent users accessing some web sites such as facebook , youtube and hotmail etc.

Which ASA 5505 IOS version should I use to block web access?
I don't want to isntall a dedicated filtering server ( websense etc) , I just want to block web sites statically on ASA 5505 via ASDM as I only have few sites to block.
know if ASA 5505 can do URL filtering, and what IOS is required ?

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Cisco Firewall :: ASA 5510 Blocking Port 25?

Dec 13, 2010

I have a Cisco ASA 5510. I have detected an infected workstation on my internal LAN which has caused my IP to be blacklisted by Barracuda Networks and other RBL. I have scanned and cleaned the workstation removing the spambot. I want to prevent all my internal workstations from sending SMTP traffic on Port 25 through my ASA 5510 device. I only need to allow my Exchange Server access to send out traffic on port 25. configure this setup using ASDM 5.0?  I know it may be easier using CLI, but using the ASDM would really be preferred.

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Cisco Firewall :: ASA 5505 Blocking FTP Port

Nov 28, 2011

I am working on an ASA5505 and am trying to open the ftp port. I have a server ( on the local LAN which is attempting to download antivirus updates from the net via ftp.  
ASA Version 8.3(2)
hostname SITE
enable password XXXXXX
passwd XXXXXX


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Cisco Firewall :: SA520W - Blocking URLs

Mar 17, 2011

I purchased a SA520W for my company, and i have some probles for configuring firewall. I want to deny access to facebook, youtube and twitter but not for 4 hosts which needs this websites for work. I tried to configure content filtering > blocking URLs but with this solution, I deny acces for all users, So, I tried to make IP v4 rules :

The 4 hosts who may access to these websites are to 127
Example :
Service : Any
Action: block always
Source hosts : to
destination hosts : (one of the facebook's ip)
but it does not work. So, I am looking for an other solution, or maybe my rule is not correctly configured ?

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Cisco Firewall :: Blocking P2P Traffic On E2500?

Feb 15, 2013

networking but can understand with a bit of explanation.. I own a restaurant and provide free WiFi for my customers with a Cisco E2500, I am gettign bills that are through the roof, I contacted my ISP and was told users were accessing P2P downloads(uTorrent, etc.). How can I block these applications?

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Cisco Firewall :: 5510 Blocking All Websites Except Few

Nov 16, 2011

How to block a single website, but I want to do the opposite. I would like to block all website except for a handful of them. Any example configs?

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Cisco Firewall :: Blocking Countries On ASA 5505?

Sep 8, 2011

I am required to block the IP neworks used by approx 10 coutries.  The issue is if using an ACL this works out to be about 18,000 lines, I have done all the summarization possible.. are there any other options? as the ASA 5505 crashes when implementing this many lines.

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