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

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Permanently add a firewall exception on Windows 7

I'm using Windows 7 32-bits and on every start-up, a Windows security alert popup is displayed and I need to authorize the programs to access the network. If I accept the popup, the program can ...
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6 views

Programming the firewall on a Siemens router

I have a Siemens ADSL SL2-141 router. From the web interface, I can program the firewall (e.g. block/unblock IP addresses). I want to do the same programmatically via telnet. But, when I ask for ...
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7 views

IPSet with IP6Tables ERROR

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

Login before using the internet [migrated]

How do you setup a user login page in order to connect to the internet just like the one at McDonalds and Radisson Blu? What kind of setup is that? We are in school and would like to have that kind ...
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25 views

Opening a port on CentOS server not working externally?

I am trying to to setup a Ghost blog instance on port 80 of my CentOS 6 virtual server. There are no pre-installed web servers occupying port 80. If I run Ghost in production mode as a background ...
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16 views

Is it possible to restrict access to certain URLs for individual programs?

I have a certain use case where I want to whitelist a list of URLs that a certain application can access. In other words, I want to sandbox it, but don't have access to blocking or white listing those ...
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1answer
21 views

No Internet Connection on using Buffalo WHR-G300N

I have used the Buffalo WHR-G300N over 2 years while I will use it for connecting all of my devices to Internet @ home. However, two days ago, I have the issue that the router suddenly disconnected ...
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1answer
27 views

Iptables rules to only whitelist SIP providers

I have an Asterisk box sitting behind an ADSL router/modem. There are no other services on the Asterisk box, just telephony. I am getting a lot of traffic which I think are SIP probes. I've ...
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19 views

Firewall policies

I have a Juniper 5GT firewall that I use for my home server, On my home server I have an SSH server running, I am trying to access the SSH from the untrust side of the firewall, from what I believe ...
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1answer
9 views

Restricted logins + almost all ports closed : secure?

Context : I plan to travel. I want to make a little cloud with my personal server. I wish I could d/l some of my files and eventually upload some files which will not be executed and the whole is ...
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1answer
25 views

Redirect ports with iptables

I need to do redirect port 443 on all interfaces to 8080 on one interface using iptables on a box with 2 NICs. I also need to block pretty much anything else on those interfaces. Here is my iptables ...
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4 views

How to configure sSMTP with CSF?

I have a fresh installation of Debian and I just installed Config Server Firewall (CSF) and sSMTP (with Gmail as SMTP server). Does anyone know how can I tell CSF to use sSMTP when it's sending ...
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3answers
29 views

outgoing ssh fails from only one machine on lan to outside network

I have multiple servers in my LAN (which I'll refer to as Box1), and they are all able to make outgoing SSH connections, except one that stopped recently, which I'll refer to as Box2 (actually, I'm ...
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1answer
24 views

Questionable NTP Traffic at Firewall?

I checked my firewall logs and noticed odd traffic patterns for NTP or UDP/123 (shown below). I don't understand the round robin'ing that's occurring from my hosts. And I don't understand why its ...
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2answers
29 views

Windows 7 - View list of sent files (Firewall)

Is it possible to view any files that have been uploaded from the computer through the firewall? I have been using a keylogger and my AntiVirus flagged it as a virus today. I would like to know if its ...
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21 views

iptables error “FIX ME! implement getprotobyname() bionic/libc/bionic/stubs.c”

When I do this rule, the error shows up iptables -A INPUT -p tcp -m tcp -m multiport ! --dports 80,443 -j DROP I've also found some solutions. getprotobyname() just converts protocol names like tcp ...
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20 views

Firewall blocking access to cpanel admin page

a firewall is blocking access to my cpanel admin page. I get a Cpanel login box but when I enter username and password it says incorrect authentication. This has only occurred in the last 3 or 4 days ...
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36 views

Amazonaws blocked by modem?

since some time i have the following problem: I can't download a .exe file (in my case the "Minecraft.exe" file) from s3.amazonaws. It does not work on 2 laptops, which are connected with a Vodafone ...
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87 views

Bypass home router firewall [closed]

I have a roommate who is sometimes allowed to use my internet connection. When he needs access to the home network, I simply go into the router settings and remove his hostname (roommate-PC) from the ...
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1answer
21 views

Reach ssh server behind a router on embedded system using established socket connection

I have developed an embedded application running linux to do remote I/O control. The application open a socket connection to my server to communicate, periodically, the state of the I/O and getting ...
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2answers
37 views

Pinhole Conflicts

I am trying to write a simpler client server program, using my laptop as the server and several Android devices as clients. The server listens on a port (say, 5902) until a client tries to connect. ...
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1answer
38 views

Asterisk server firewall script allows 2-way audio from incoming calls, but not on outgoing?

I'm running an Asterisk PBX on a virtual machine directly connected to the Internet and I really want to prevent script kiddies, l33t h4x0rz and actual hackers access to my server. The basic way I ...
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1answer
32 views

Windows 7 windows firewall updates error

I'm having a issue with windows firewall. I can't turn it on or off. I also can't edit it. And Windows firewall is requesting updates, but whenever I make those updates it still doesn't work. Here's ...
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49 views

Would a switch be covered by a router's firewall

So... Hopefully; this is the right place for this question. I need more Ethernet ports on my home network. Sadly, we already have an old router connected to the main router and we still need more ...
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25 views

How can I get Windows 7 firewall from being stuck in public network?

A few weeks ago, my Windows 7 Firewall switched itself from a private network to a public network. I noticed the problem when I was trying to stream a movie from my computer to my TV (as I did dozens ...
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71 views

Block All Traffic and Allow from Defined IP only in IPTABLES

I want to create a gateway firewall for my network . I want to block all the internal traffic on gateway and allow it from two computers only . On gateway --> eth0 is network card in gateway PC ...
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14 views

Wrapping a point-to-point link

I'm using a pair of IP radios (non-WiFi) to bridge my office engineering LAN (172.0.0.0/8) to a lab in another building. The radios work fine, but they expose a web management interface I'd like to ...
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10 views

How do I configure Windows Firewall to disallow inbound connections only at work, but still treat work and home as private networks otherwise?

I have a Windows 8.1 laptop that I use at home and at the office. When connected to my router at home, I want all the features associated with Windows Firewall's notion of a "private network"--that ...
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3answers
69 views

Remote into Linux workstation behind a firewall using NoMachine or other remote desktop service

My question is very similar to this question: Remote into Linux workstation behind a firewall My work has firewall and ssh server. The ssh server is listening to the default port 22. Normally I ...
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55 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
97 views

Cablemodem (SBG6580) firewall denying some outbound traffic? Why? Not configured

I finally got around to turning the syslog on for my cablemodem (Motorola Surfboard SBG6580) and I'm seeing about the expected amount of inbound attackage being blocked... 2014-05-30 21:59:02 ...
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32 views

iptables: Is it dangerous to filter by source port?

I would like to run a stateless firewall setup and I currently have the following rules: #Do not track any packet *raw :PREROUTING ACCEPT [0:0] -A PREROUTING -j NOTRACK COMMIT #Actual firewall rules ...
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40 views

Is it possible to block websites on Buffalo AirStation WCR-GN?

Is it possible to block websites on a Buffalo AirStation WCR-GN? I've gone through every menu looking for anything that might do that and I can't, so I'm guessing this device is too primitive to be ...
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33 views

How can I connect to a VPN with a restrictive network?

I have recently relocated and the network I have been provided blocks every outgoing TCP port except for 80 (http) 443 (https) 465 (smtps?) 587 (submission) 993 ...
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1answer
94 views

VPN and getting router/firwall configuration correct

For the life of me can not get my VPN working using PPTP or L2TP or anything. My subnet is set to 192.168.13.1 to avoid conflicts. I have tried to reach my desktop/server from my laptop/client using ...
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60 views

FTP blocked by firewall on windows 8.1 update 1 public network

I've recently upgraded to Windows 8.1 u1. I connect to VPN to one of my projects, over which I connect to FTP server (using Total Commander 8.51a). Now, when I try to connect, Total Commander hangs on ...
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49 views

Firewall Block all outgoing connection

I want to block all outgoing connection. I have created a custom rule: C:\Windows\System32\netsh.exe advfirewall firewall add rule name="blockout" dir="out" action="block" enable="no" ...
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45 views

Bypassing proxy for loopback/locahost

I am developing a web application where in I am running a webserver at localhost:3000 and my app is deployed on the same. Access to this URL through a web browser works fine because there is an ...
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1answer
49 views

iptables --append FORWARD required for routing between NIC alias IPs?

I have an ubuntu box with a single NIC. In order to bind a number of services (like apache, dnsmasq, etc), I have bound them to different alias's (e.g. eth0:0, etc), some of which are on completely ...
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31 views

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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1answer
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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25 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
71 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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45 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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58 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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1answer
30 views

Glossary for Palo Alto Networks firewall log fields?

We're using a Palo Alto Networks firewall model 2050. I'm working with our IT department to forward the firewall traffic logs to an internal syslog server, and am wondering about the definitions for ...
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1answer
161 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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1answer
61 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 ...