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

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How can I restrict a user in an AD environment only to have vpn access but no directory share rights?

I'm trying to restrict an AD account to only have vpn access rights but no domain user rights. Can it be done or should I try something out of windows server's boundaries? We are using a Fortigate ...
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16 views

Firewall rule for local, interactive users?

I want to add a firewall rule that applies to a local interactive user. The intention is to clamp down the box, and only allow web and mail related connections, and update service connections. On ...
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26 views

How should I configure my Tor-dedicated firewall for optimum security?

I'm setting up a Tor-based isolating proxy using the 'Anonymizing Middlebox' iptables rules specified here: https://trac.torproject.org/projects/tor/wiki/doc/TransparentProxy i.e. iptables -t nat -A ...
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1answer
81 views

How do I fix these iptables?

I am trying to setup my networks firewall, and am having trouble because i keep getting kicked out of SSH because of mistakes. Here's what I currently have: # Custom Rules iptables -F iptables -X ...
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53 views

UFW Not Allowing Apt-Get and other HTTP Services Out

I've built a limited firewall appliance out of a Raspberry Pi, two NIC cards, and a Raspbian OS using UFW for the firewall. Another Pi (also on Raspbian) sits behind it as an application/web server. ...
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69 views

How do I drop packets that contain a certain ASCII string on Windows?

I'm trying to find a way to block any packets that have particular character strings. I want to specify both the content to filter for and the destination port. I've looked at several firewalls but ...
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21 views

Windows Firewall - Block everything except one application not working

I want to block every possible application/service/whatever from accessing the internet except for Chrome in Windows 7 I have set inbound and outbound connections to be blocked for the Domain, ...
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170 views

Game Client's Listening Server Unable To Establish A Successful TCP Connection (Updated)

Scenario, A Risk of Rain On a game called "Risk of Rain" (RoR), I am hosting my own listening server. However to my demise, it seems that nobody can successfully join my server. I have done the basic ...
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32 views

Why are these iptable rules keeping me from browsing the internet? (allowing 80,443,53)

This is for my home machine. Here are the rules: Chain INPUT (policy ACCEPT 0 packets, 0 bytes) num pkts bytes target prot opt in out source destination 1 ...
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70 views

Router Firewall: All ports stealth mode except when I connect using VPN-then port 88 open

I am using a Netgear wireless router, and its internal firewall is good. Testing by using Gibson Research "Shields Up" indicates all ports invisible. However, when I use a VPN service to connect to ...
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114 views

Possible to find out what's using javaw.exe to connect outside the network?

Is there any way to find out who/what is running something through java/javaw.exe, in order to determine if the outbound network connection is safe or rogue? I use a third-party firewall (Windows ...
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100 views

Is there anyway to see when a Windows firewall rule was created/enabled using PowerShell v2 or CMD?

I have been poking around the interwebs but I cannot seem to find a definitive answer to this question. I am forced to work with PowerShell v2. I know that using the following command will give me a ...
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79 views

ping behind firewall, success for some hosts, fail for others?

I'm under firewall, I can ping to some hosts but not to other hosts my IP addresss 172.19.7.111 mask 255.255.240.0 I can ping to host 172.19.2.111 (that I discovered with Angry IP Scanner) but not ...
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1answer
37 views

Why isn't my router allowing my PAP2T to connect to my VoIP service?

My tech knowledge is middle-low: as you can see I'm not shy about getting into the interfaces for my router, but have no idea what the more complex settings mean. I got a new wireless router (D-Link ...
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1answer
23 views

Do you need a software firewall when using VPN?

How secure/vulnerable is a remote laptop with no firewall enabled but connected to the office through a VPN? The office has a network firewall.
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43 views

OpenVPN Server & Two Gateways

I have a network setup as follows: The firewall allows incoming connections for the VPN server on OpenVPN ports and all outgoing connections from the NAT. It is stateful, even for UDP "connections" ...
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1answer
40 views

Ports in Linux vs Windows

I'm studying for a security class. I know that ports in Linux are tied to a process. So if I wanted to close/shutdown a port, I'd end the process that's using it. So if I'm in Windows, what's ...
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1answer
48 views

SSH into host on the same network behind a firewall that blocks SSH

I'm trying to SSH into my Raspberry Pi, which is on the same wireless network as my SSH client. My firewall blocks SSH connections. I changed the sshd listening port in my Raspberry Pi to 80 like ...
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1answer
62 views

Unable to change Windows Firewall settings

I am unable to access the settings for Windows Firewall on my Windows 7 32-bit computer. I go to System and Security (Start > Control Panel > System and Security) and click on Windows Firewall, but ...
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88 views

Windows Firewall inbound rules still blocks ports

I applied inbound rules for port: 1935, as well as outbound. When I check on canyouseeme.org, it says it (port 1935) times out. When I completely turn off Windows 7's firewall, it works without a ...
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1answer
272 views

iptables blocking all traffic even with ports opened

Simple as I can put it: I can't access my servers with iptables enabled, with default rules. Need to disable iptables to get access. Trying to find the cause. Only difference in setup type is layer3 ...
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197 views

Opening port 8080 on Windows firewall

I am not sure if I am just missing a trick here and it will be something rather simple, or if I am trying to do something that just isn't going to work.. Anyway, I have an asp.net site and I am using ...
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34 views

What happened to Comodo Defense+?

I just updated Comodo to version 7, and there is only the Firewall now. Defense+ seems to have been discontinued as I can no longer find it. What happened to it?
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84 views

Conntrack/NAT's port mapping for a specific port breaks whenever that port's service is shutdown for too long. How can I fix this?

Linux Gentoo 3.13.6-hardened-r3 #1 SMP Sat Apr 12 09:17:25 EDT 2014 x86_64 Intel(R) Core(TM)2 CPU 6300 @ 1.86GHz GenuineIntel GNU/Linux hardened with grsecurity and selinux with a strict policy in ...
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127 views

Prevent the use of VPN/SSH to bypass porn blocking solutions

I've read the various questions about content filtering and it seems that openDNS is the consensus solution, although it's easy to bypass with a VPN service or an SSH tunnel. Is there a way to ...
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149 views

Is it possible to route all traffic on VirtualBox host adapters to guest?

I am upgrading Ubuntu 8.04 on a dedicated router/firewall/NAT/SMTP/SSH server with a current Linux (Debian Wheezy). I am using VirtualBox (4.2) with Ubuntu 8.04 as host and the new Debian build as ...
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278 views

Is the Whitelist Network Service Filter Feature on ASUS Routers broken?

I have a ASUS RT-N16 router running firmware version 3.0.0.4.374_4422 I have a voip phone (physical) with it's own private IP address (for the purpose of discussion, let's call it 192.168.0.1) and ...
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1answer
96 views

mac osx littlesnitch blocking outgoing connections from ssh remote login

I have setup remote ssh access on the rush in my development computer (OSX 10.6.8) before leaving my home for holiday yesterday. It is correctly setup, and I can access it via SSH, logging is as root ...
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72 views

How to block all applications from accessing a connection in Windows 7 firewall?

I consider myself quite tech-savy but this one gives me real pain. I've connected to VPN through PPTP and I'm attempting to set up firewall rules to block any application from using it. Essentially, ...
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153 views

configure iptables to block all(as much as possible) bittorrent traffic

good day all This is my current iptables setup Generated by iptables-save v1.4.7 on Wed Apr 9 13:50:31 2014 *filter :INPUT DROP [0:0] :FORWARD DROP [0:0] :OUTPUT ACCEPT [0:0] :LOGDROP - ...
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49 views

Blocking an IP in Windows Firewall

I am attempting to block a connection to a games' masterserver (see this for more information, including why I am trying to do so), but however redirecting the DNS has not worked, so I am trying to ...
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86 views

How to configure sonicwall to allow systems from internet to access dlink ip camera?

I am trying to configure sonicwall to allow access for the ip camera from internet. The camera somehow sends out ARP packets which are being dropped at the firewall. When used packetmonitor to see ...
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125 views

What might these connection attemps mean?

Yesterday I opened a port on the router, forwarded to LAN IP 192.168.1.201 and blocked the ADSL company password to access the router. There is no other open port on the router. This log is from the ...
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73 views

Block a Subdomain in Windows Firewall

Gamespy is ceasing its Master Server support for many games at the end of May, including Crysis 1, Wars, and 2. I have worked with Crysis 1 and Crysis Wars for a very long time, and now the entire ...
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54 views

How to allow ssh into a device on remote 4g modem when provider is blocking inbound connections?

I am planning on deploying a network of remote devices, each connected to the internet through a 4G modem. The devices need both outbound connectivity to our cloud-based servers, and occasional ...
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146 views

Reset Enable password ASA 5505 via ASDM

I have an ASA firewall setup, but i have forgot the enable password; I have the admin password anyway. I am not trying to reset password using rommon; Please dont suggest confreg break I saw an user ...
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30 views

Juniper Firewall setup

I bought an old Juniper 5GT firewall simply to do some port filtering. I have set the device up in a DMZ zone of my home network, there is a server behind it and it has been assigned an IP by the ...
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81 views

IPtables preventing outgoing packets

I am trying to setup firewall rules on a RHEL webserver, so that my webserver can serve up web pages and at the same time download remote files using curl/wget. Problem I am experiencing is I can only ...
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54 views

Display port numbers and port names

How do I display both port numbers and port names at the same time? I can display the forward port numbers (i.e. 22, 25, 1000, 443, 80) using the following: [root@michaels ~]# iptables -L -n Chain ...
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57 views

Changing the ports a program uses

This question might not even make sense. I have a very limited understanding of how networking protocols work. My phrasing of these questions might be very poor. My school has a firewall enabled. ...
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3answers
106 views

Making Win XP as future-proof as possible [closed]

So Win XP is finally going off life support. Unfortunately, the Print Shop I work for has equipment that requires XP (i.e. no drivers are supported in the newer OSes) We have upgraded most of our ...
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40 views

Access MySQL running on VirtualBox Win7 guest from a VirtualBox XP guest

I have a Windows 7 host, and 2 VirtualBox guest machines running on it. One has Windows7 as well and running a MySQL 5.6 server. The other guest has Windows XP. I want to run a software (for testing ...
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148 views

UDP Flood to Host in the firewall logs

When the router's firewall logs shows as follows UDP Flood to Host PRIVATE_LAN_CLIENT_IP, PORT ->> EXTERNAL_PUBLIC_IP, PORT (from WAN Outbound). Will those packets be routed to the private lan ...
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51 views

Windows Firewall: Limit Google Chrome to only local network connections

By local network, we mean within the subnet of the computer in question. The idea is to disallow browsing of internet web pages, while allowing ones served locally. Disallowing a particular local ...
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42 views

Windows Firewall: how to block all internet traffic except ones to/from Windows Update and Antivirus update?

Should it be done via block all except Windows Update & AV Update internet IP addresses; or block all except Windows Update & AV programs (is this possible to do?) If so, how? And if ...
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1answer
42 views

Client and Server program running onto the same Windows 7 computer. Can I restrict access to the Server one via port management?

I am running Windows 7 - 64 bits. I have a program that works in client-server mode, this is: there are, in fact, two programs (a client and a server) that runs on the same Windows computer. The ...
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3answers
159 views

If you block an .exe file in Windows Firewall, are you also blocking the .dll files it uses or it needs to be done separatly?

Let's consider this scenario: There's some X software downloaded from the internet with one .exe file and several .dll files. The .exe file is prevented from accessing the Internet by using Windows ...
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1answer
108 views

telnet 500 Syntax error, command unrecognized

I'm trying to send email using telnet in cmd. I have connection with telnet now C:\Users\Student>telnet alt3.gmail-smtp-in.l.google.com 25 then it brought me here: 220 mx.google.com ESMTP ...
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46 views

Bridged routers and firewall

I have started to do quite a bit of research on securing my home security after a virus outbreak between some computers. Wanting to isolate two sets of computers, I came to the conclusion to make a ...
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570 views

How to Block Ultra Surf Proxy Client on Windows

How can I effectively block ultrasurf which is being used on our company network. With ultrasurf all web filters applied on the network are useless. Does anyone have a solution to this problem?