A firewall is a piece of software that controls what connections can be made to and from a network.

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Windows 2008 Firewall - How do I restrict HTTP inbound to specific IP?

My goal is to restrict all HTTP inbound requests to a specific IP addresses. I thought it would be a simple process - but I am not getting the result desired I have modified a predefined rule called ...
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1answer
2k views

Allow access from outside network with dmz and iptables

I'm having a problem with my home network. So my setup is like this: In my Router (using Ubuntu desktop v11.04), I installed squid proxy as my transparent proxy. So I would like to use dyndns ...
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1answer
1k views

Why are SSDP multicast packets blocked on m0n0wall; how to unblock them?

My firewall logs are being flooded with logs of packets being blocked that i don't want to be blocked: Every 3 seconds there are 2 packets being broadcast from my machine: Interface: LAN Source ...
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1answer
3k views

Block websites to a certain IP range with mikrotik router

I have a MikroTik Router 951Ui-2HnD that connects my computers with the ISP. I want to block Youtube and Facebook but only in a few computers. I created a Layer7 Protocol with: Name : Denied Websites ...
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1answer
120 views

IPSet with IP6Tables ERROR

Can someone please solve my headache and tell me how to fix this? [root@www ~]# ip6tables -I INPUT -m set --match-set blacklist6 src -J DROP ip6tables v1.4.7: Couldn't load match ...
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1answer
3k views

Why does NTP require bi-directional firewall access to UDP port 123?

From What are the iptables rules to permit ntp?: iptables -A INPUT -p udp --dport 123 -j ACCEPT iptables -A OUTPUT -p udp --sport 123 -j ACCEPT Also, from the NTP website: ... ntpd requires ...
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1answer
158 views

SSH: can connect to computers on local network but cant connect remotely

I have 3 computers running ssh server on them: PC1 is running Cygwin on Windows PC2 is also running Cygwin on Windows PC3 is running Linux and they are on the same network connected to same ...
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128 views

How to use google search via SSH tunnel?

I live behind the Great Firewall of China (not very proud of it) and I'm slightly technical. So I use SSH tunnel to route all connection to my VPS. (i.e. ssh -D port and then set localhost:port as a ...
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335 views

Firewall is blocking internet traffic to OpenVPN clients

I have a virtual network setup with a Linux router/firewall connected to two private networks. An OpenVPN server in routing mode and a web server are in one of the networks. On the other are linux ...
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1answer
144 views

SSH Port closed although forwarded correctly

I'm having an issue with opening my SSH port. Here are the symptoms. Within the local network I can ssh to the machine, including both locally (ssh localhost) and from alternate computers. I have ...
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1answer
202 views

How to simulate yourself as if you are located internally behind the trusted zone of a FW

I work in security operational center engineer in one company. We manage a lot of customer FW, proxy,..etc. An example of our daily tickets could be the user can't access some site, so we check the ...
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1answer
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How to allow Dropbox to auto-update by adding an exception to ESET firewall?

I am using ESET Smart Security v5.2.9.1 and Dropbox at Windows 7 x64. The problem that I am facing is that every time Dropbox wants to auto-update, it downloads an updater file that has different ...
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1answer
6k views

How to setup firewall to allow internet connection sharing via Wifi USB stick?

I have a Windows8 computer linked to the internet via an ethernet cable ("Ethernet" network connection). I have attached to it a DLink Wifi USB stick, and I'm trying to share the main PC's internet ...
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28 views

Malware transmitted over network

I am doing some tests in my second computer which involve dropping the firewall and antivirus. I'm trying to isolate the 2 systems so malware can't jump between them. Both systems have win8 ...
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377 views

VPS doesn't allow connections, filtered ports?

I have a Windows Server 2012 VPS, which I'm hosting a game server on. My users needs to connect to the client, through a web-based client. My problem is that, it doesn't seem to be able to connect to ...
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34 views

Monitor and limit network usage

A costumer of mine has some off site locations, where his internet usage is supplied by a cellular router. The router is connected to a switch and a WiFi hotspot. The client has a problem with ...
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105 views

Residential ISP possibly blocking SSH and other odd high ports - how to verify?

I have recently had a problem in a scenario where I am having to run SSH and some other high number port services behind a residential connection. I am suspecting that the ISP is performing some level ...
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123 views

java is listening from :::0 Causing firewall dialog that appears then disappears

Every 3 hours or so on my mac, a firewall dialog appears and disappears almost instantly. It lasts long enough to be annoying, but not long enough to read it. When it happens, I check appfirewall.log ...
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473 views

Allow only VPN traffic with GUFW not working

Running Kubuntu 13.04 I have read this tutorial about only allowing torrent traffic with GUFW but it seems this is not working for the browser. My torrent application is working but I cant browse any ...
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772 views

Connecting to a machine via remote desktop when blocked by firewall

I am at a client site, and have a machine on Azure which I need to RDP onto. The machine I have to work on is very locked down, as is the network, and as a result remote desktop just isn't connecting ...
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335 views

iptables not working on DDWRT firewall

I have write a firewall rules for DDWRT router but I didn't work. What I needed is, I would like to set all my wireless user, once it reach daily quota which is 200mb it will disconnected from the ...
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348 views

Firewall is blocking echo request on port 7 (TCP)

I have an app which needs to receive a message back from the server. With the firewall on, I do not get the message back. If I turn off the firewall I get the request back. I have added some rules ...
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17 views

Work with a SSH connect rate limitation in the firewall

My university uses a firewall which limits the SSH connect rate. Since I often do one-off scp or rsync commands, I quickly run into that rate limitation. Is there some way to use a persistent SSH ...
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242 views

Configuring port forwarding for SSH - no response outside LAN

I recently moved, and at the same time purchased a new router (Linksys E1200). Prior to the move, I had my old router set up to forward a port for SSH to servers on my LAN, and I was using DynDNS to ...
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68 views

Windows 7 Security setup with firewall

Sorry if this is a repeat, but I have been searching the forums and haven't found an exact answer for my question. I have had some security concerns on my home network lately so I decided to take a ...
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29 views

How can I view the web accessed through the firewall?

My company has a flash application with dynamically updating content. From what I can tell—I, of course, do not have the source code for the flash application—the flash application uses a type of GET ...
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176 views

IPTables masquerading stops working

In a classical SOHO setup I am running a Debian box as router/firewall. For an unknown time now I have an issue, where the MASQUERADING on the output connection (PPPoE) stops working for one of the ...
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80 views

Win8 Firewall Apps blocked

i set the Win8 Advanced Firewall to "Block all outgoing connections". Problem is now i can get neither the winstore nor my mail apps to access my microsoft account data (e.g. outlook.com email or sign ...
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749 views

How do I open ports on an Actiontec MI424WR?

Visiting a friend who has Frontier FiOS internet and an Actiontec MI424WR broadband router, latest version. While their ethernet connection works for web browsing, they are experiencing what I believe ...
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4k views

Connection refused (WSAECONNREFUSED) OpenVpn connecting refused by server side

OpenVpn Gurus, I successively configured my Openvpn server.ovpn and client.ovpn files and all other required certification files. And I could load them on my server computer. Please first have a ...
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437 views

My mac has port 49176 open, what is it?

Does anyone know what port 49176 means on a Mac? I cannot find any info on this particular port. I'm on Mountain Lion, and using nmap from Ubuntu machine to test the Mac's firewall. This is what nmap ...
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2k views

Ports not forwarding & UPnP not working on SonicWall TZ210

I have a REVO DVR system behind my SonicWall TZ210 firewall and have ports 8200, 8016, 12088, and 10019 forwarded to the DVR system. However, when I connect remotely the ports are not forwarding to ...
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463 views

How can i make my Netgear WPN824V2 Router more secure?

I realize, in the research I have done so far, that the memory to import into this router is too low to run any custom firmware, it is updated to the current newest firmware. But my problem is that ...
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252 views

How to open the restricted site if request is coming from the particular server

Is it possible to create some defination in firewall to open the restricted site (say facebook) if it is coming from the server where our application is hosted but restrict from anywhere else. ie.say ...
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81 views

Is it possible to let the access point handle the firewall rather than the main router?

I have two routers: one is ADSL, the other one is a broadband, and my line from the ISP is ADSL. So, I did use the ADSL router as the main one that handle the connection to the internet, and used the ...
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113 views

Computer for some reason won't accept requests. Can send requests though. (All on LAN)

I'm on a LAN and I've been working forever trying to figure out what in the world is wrong. After much pain, I've come to this. I can ping Computer B and Computer B from Computer A but Computer A ...
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163 views

Opening a specific port on Mac

I need to open a specific port on my mac client (because when I try to connect from server it says "target machine actively refused it ").My problem though is I cannot find a way to add a specific ...
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268 views

Can I see list of all IP blocked by my firewall and router?

I am using inbuilt firewall of windows 7. ( I am also using Microsoft security essentials ). My router is Netgear WNR1000v2 . Now can I see list of all IP which are blocked by either my firewall or ...
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36 views

can in-browser flash be stopped from interacting with the network, either via configuration or through firewall (on Windows)?

suppose I want to allow loading of SWF files (like ads, simple games etc) but I don't want to allow them transmit info back to the server. How do I go about doing this on Windows? Is there such ...
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430 views

Robust way to acces my computers behind NAT and firewalls?

I am searching for a robust way to access my computers (on any port when possible) whether they are behind several NAT gateways or not. By robust I mean I want to access the computers whenever they ...
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320 views

Router port forwarding stopped working

First of all, I've read all the relevant questions here I could find... I use RealVNC to connect to my computer at home - everything worked without any problems, but today I couldn't connect from ...
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182 views

Temporarily only allow network-access via (sshd-socks) Proxy

I am alot on business trips using the hotel's hotspot. I connect to my solaris-server using putty/ssh and establish a socks-proxy. Using Chrome and Proxy Switchy, I surf via the sshd's socks-proxy. ...
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230 views

Common Ports with Adium

I was wondering if there was a way to use common ports with Adium in order to bypass firewall settings? Any recommendations would be greatly appreciated.
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218 views

Norton Internet Security 2012's Firewall Is Blocking My Internet Access?

I am running Windows Vista; last week my Norton Internet Security expired, and I had to renew. After installing Norton Internet Security 2012 I am unable to connect to the internet. I think that ...
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2k views

Endian firewall: How to limit bandwidth per total host / user

we have an endian firewall whit 2 dsl line and 30 user/host who use internet. Is it possible to limit the total bandwidth PER active host ? Suppose the total bandwidth is 3mbps and there are 3 user ...
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177 views

Why do BT router firewall rules keep resetting?

A large number of our customers have routers supplied by BT when they order business broadband. When the routers are installed, we configure the firewall to allow our EPOS system to communicate ...
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296 views

Little Snitch: how to selectively allow a single script to access the internet?

I have a python script that accesses the web and each time it launches I'm prompted by my Little Snitch to allow the connection by Python. I don't want to allow globally allow Python to connect, ...
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135 views

Sharepoint behind ClearOS firewall

I have a Sharepoint portal on the cloud which I can´t access from behind my ClearOS firewall at home. Everywhere else I don´t have any problem accesing the portal sites. Any ideas?
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310 views

IpCop GN-WP30N-RH cannot find the network card

I'm trying to install a GBabyte AirCruiser N300 PCIe Desktop Adapter (GN-WP30N-RH) on IpCop, but it cant find the card. How I do to install it? Here is lspci: 00:00.0 Host bridge: Intel Corporation ...
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19 views

How to get a log each time a packet is blocked by Windows7 firewall?

I would like to monitor if when sending a document to a printer, the Windows firewall enters in action. How to get a log each time a packet is blocked by the Windows integrated firewall? Some people ...