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

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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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101 views

Accessing the internet through a proxy

I guess I have to start with some background before I get bombarded with 'why' questions. I work at a large corporation which I will call a-company. They use domain servers and a proxy/firewall to ...
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1answer
190 views

Terminating OpenVPN after disconnect - how to disable reconnecting

I want my OpenVPN client application (running on A) to quit when it is unable to connect (or reconnect) to a server (B). I use the UDP protocol. Both A and B are Linux systems. More precisely, I keep ...
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26 views

What firewalls from non Dell companies are comparable to the TZ 205?

I need a new firewall and the Dell Sonicwall comes with no warranty or support apparently. (I tried to install a new TZ 205 and when I hit a problem, upon entering a support ticket I was told that the ...
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1answer
548 views

Can't block icmp traffic with Mikrotik

I have two computers in lan network. I want to block ping requests from one to another (firewall testing). There's no other filter rules. I tried to add this /ip firewall filter add ...
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148 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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1answer
178 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
26 views

List rules using iptables in a customized way

How to list the iptables rules in a customized way? Like: target protocol portnumber src dest the order could be changed but I dont want the name of protocols, just number (like 80 instead of http) ...
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1answer
341 views

How to block all connections on domain controller except one computer in domain

I want to block all connections in windows firewall on domain controller except computers in domain and allow domain clients only exchange files in one location by one program (total commander) How i ...
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44 views

My new computer is blocking access to my webserver when in use

I have been running a web server for a while. It is hosted using lamp on a computer that I have running Ubuntu and has worked fine until recently. I got a computer that runs Windows 8 to use as my ...
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1answer
809 views

Adding many IP addresses to Windows Firewall using CLI fails partially

I have a PowerShell script which adds IP addresses to Windows Firewall using the "netsh advfirewall" command. (As described in this question: How to append netsh firewall rules, not just replace). ...
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1answer
21 views

i am not able to connect to the application hosted on port 80

I am trying to access an application that is hosted on port 80. When i try the url from my personal computer , the site is not reachable but the same url on the server( which hosts the application) i ...
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121 views

OSX firewall (ipfw?) to allow only specific hostname via VPN or Screensharing

I have an iMac with ScreenSharing enabled & VNC allowed. Remote users (over internet) can successfully connect via WIN (RealVNC) or Mac (ScreenSharing) to remote admin this machine. I would like ...
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1answer
204 views

Firewall and Blocking [More] Traffic

I have a MacBook Pro with the firewall on. I'm trying to run a Wireshark trace and the noise bleeding through Apple's firewall is very distracting. According to the image below, most of this noise is ...
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1answer
38 views

connect through a remote pc to take IP address

We have a static IP address. This IP address is allowed to pass some of our customer's firewall. Problem is when we are outside the company, we are on our laptop. that uses a Internet key with dynamic ...
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1answer
100 views

Firewall between Client and Server - Which ports do you open?

I want to know the following: (exam type question) When you have a client-server system, that uses uncommon ports (e.g. in range 48000 - 49000), and you have a firewall between the client and the ...
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1answer
209 views

Understanding how dnat works in iptables

I'm running 3 virtual machines with Fedora 19. The machine B is set up with two networks adapters and provides que channel between machine A and machine C. The machine A IP is set to 192.168.1.3 and ...
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1answer
46 views

unable to start apache after changes to rc.conf and resov.conf

I had a working configuration this morning with the following simple /etc/rc.conf ifconfig_rl0="DHCP" ifconfig_xl="inet 192.168.1.11 netmask 255.255.255." defaultrouter="192.168.1.1" I added the ...
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1answer
63 views

lost connectivity after changes made to rc.conf (freeBSD firewall)

I had a working configuration this morning with the following simple /etc/rc.conf /etc/resolv.conf is completely commented out. ifconfig_rl0="DHCP" ifconfig_xl="inet 192.168.1.11 netmask ...
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1answer
275 views

Redirect PROXY traffic to test box using IPTABLES

Marked this as answered. I'm going to pass on trying to get this to work. It was only for testing. I'm currently using a proxy server (squid) that's listening on port 8080. Users' browsers are ...
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872 views

Can't connect to qbittorrent (or other client) Web UI, except through localhost

I'm trying to use qBittorrent's (I've also tried other torrent clients') remote Web UI, but can't seem to get it to work. I can connect just fine using http://localhost:PORT, but can't connect using ...
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1answer
95 views

iptables FORWARD rule

I'm running 3 virtual machines with Fedora 19. The machine B is set up with two networks adapters and provides que channel between machine A and machine C. The machine A IP is set to 192.168.1.1 and ...
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16 views

Why must I add SSMS to Firewall to be able to connect as CLIENT

This issue is confusing me very much. I am connecting to a remote SQL Server (through VPN) and was unable to connect to it at all until I disabled the windows 7 firewall. I didn't want to ...
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3answers
153 views

Modem -> Firewall -> Switch -> Wireless?

I'm setting up a home network for the first time. The best solution for setup that I've come up with is to have 1 wireless router serve as the firewall between the modem and switch, and another serve ...
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66 views

Define IPTABLES rule

I am working with a linux based UTM appliance and have some disagreement with the client on the operation. THere is a standard GUI to configure port forwards in the firewall but for some reason he ...
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1answer
584 views

Yahoo Mail behind a watchgaurd

I'm getting the following error when I open a thread in the new Yahoo mail behind our watchguard firewall Response denied by WatchGuard HTTP Proxy. Reason: header 'Content-Type' denied ...
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13 views

Is it OK for git to access priviledged resources when I open a context menu on W 8?

I wanted to copy a file Right clicked on it Firewall tells me git.exe is trying to access priviledged resources I say no Context menu opens (with git options there, but I didn't try clicking, I ...
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112 views

How to secure DDNS?

I would like to be able to connect to my download server's web control (Raspberry Pi) from the internet. The PI is behind Mikrotik router which has NAT installed. The Router is also behind ISP's ...
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29 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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2answers
72 views

How do I do this without an expensive firewall?

I've got a cheap-o Motorola Cable Modem for now and I hate it. I'm used to doing this with SonicWALL routers but life happened. I need a way to isolate these groups securely and keep threats from ...
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73 views

Multi-interface routing/firewall configuration

I have a small network behind a pfSense (2.0) box. Up until yesterday I had only one internal net, 192.168.0.0/24, and everything worked quite nice. Now, however, I want to introduce another net, ...
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275 views

nc -v -w 1 111.111.111.111 -z 22 returns port 22 (tcp) timed out: Operation now in progress

Encountering a strange problem on my Ubuntu machine, trying connecting to 111.111.111.111 (example ip) via SSH fails. When trying to connect from other win machine its works. I don't have a ...
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124 views

Is Windows Firewall active on OpenVPN connection?

(This applies to "private" Internet browsing through a VPN such as privateinternetaccess.com) If I connect to a VPN using OpenVPN client on my Windows 7 box, will the Windows firewall be active ...
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1answer
458 views

Blocking incoming connections from IP in windows XP

I have a request to block any incoming connections from a block of IP addresses but they would like to leave the outgoing traffic alone (no block). Is there a way to do this in Windows XP? The ...
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1answer
75 views

Unable to access internet from Windows Command Processor

I am unable to access internet from the Windows Command Processor. Below is the output on doing a simple ping: C:\Users\vivekkumar>ping www.stackexchange.com Pinging www.stackexchange.com ...
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78 views

Simple and light firewall over Comodo IS only when 3G Data is used

I'm looking for a simple firewall, to run only when the notebook ( win 8 ) is connected to the 3G access point of the smartphone or ipad, to block some extra traffic i don't want to, like any kind of ...
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3answers
120 views

what is the purpose of the `unlock` command button of `gufw`?

gufw is the GUI version of Uncomplicated Firewall. What is the purpose of the unlock command button of gufw? This command button disappears once it is clicked. My configuration is Ubuntu 12.04 with ...
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1answer
237 views

website blocked by netgear firewall

I have a Netgear DGN10000 supplied by Virgin Media in the UK. It is running the latest firmware (V2.1.00.25_VG). For some reason it appears to be blocking all URLs which contain "microsoft.com" ...
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1answer
1k views

How to allow windows store apps and the windows strore to pass the windows firewall

I use the windows 8 firewall and I wanted it more secure, so I block incoming and outgoing connection. Unfortunately I realized that the windows store did not work as well and all application from the ...
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How to enable all windows application store and the store windows to pass the firewall? [duplicate]

I wanted to optimize the security of my Windows 8 firewall so I blocked both incoming and outgoing connections. I then proceeded to define certain exceptions. I realized that the Windows store is no ...
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52 views

Logitech telling us we have an unsecure network and trying to charge $99?

My boss is trying to set up a Logitech webcam on his computer in the office and he called Logitech support, and they were trying to fix it and could not so he let him on his computer he said he could ...
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0answers
218 views

can't obtain ip-address from my dhcp

I can't obtain a ip-addres from my dhcp-server and it's going trough a firewall (pfsense), The firewall(pfsense) and DHCP server are two virtual machines on my physical server(ESXI). As rules i use ...
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1answer
224 views

Iptables output with options unknown

I have been learning and studying up on iptables and port forwarding. There is a sample iptables output I can't decipher. It has the options --dir, --pol, and -m. Although I am familiar with -m it ...
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1answer
388 views

UFW rules for specific host / dynamic dns

How can I setup UFW (Uncomplicated Firewall) to add rules for specific hosts? Eg. I want to allow SSH only from yourpc.no-ip.org?
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2answers
166 views

Configure HP iLO MTU Setting - Site is behind several firewalls and MTU requires lowering for access

Just wondering if anyone knows how to adjust the MTU setting for a HP server iLO NIC? The site is behind several firewalls and we have had problems with other things that has required us to lower the ...
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117 views

Public IP is not accessible

I have a VPS, after a DDos attack, the service provider disabled my server until the attack finished. After recovering from the DDos, the main IP is not accessible at all! I don't know where to look. ...
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738 views

Fedora's firewalld vs iptables

I am on Fedora 19. Is my understanding correct that as long as firewalld is up and running (and properly configured using firewall-config) the contents of the /etc/sysconfig/iptables has no meaning? ...
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314 views

Can we prevent vsmon.exe (ZoneAlarm True Vector service) from hijacking TCP connections

I just noticed that vsmon.exe from ZoneAlarm firewall started to act like proxy for TCP connections (I am guessing it's doing the same thing for UDP packets internally). I use TCPView.exe from ...
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1answer
64 views

Limit download over certain filesize through network

This is more of a network question rather than programming but Is there a way to limit a download over lets say 20MB to throttle at 16KB? I am trying to limit files over 20MB to throtle at lets say ...
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87 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 ...