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

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282 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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1answer
14 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

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
9k views

Mikrotik Firewall rule: block all connection except to VPN server

As the title says I need to block all the connection to mikrotik router from outside except connection to VPN server. Then allow Remote desktop to LAN's system over VPN(either L2TP/IPSec or PPTP) from ...
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1answer
189 views

Should fwknop be listening to a port?

I am trying to install fwknop on a VirtualBox Debian 7 machine. It installs with no error (apt-get install fwknop-server -y), i made the modification in /etc/default/fwknop-server file so daemon ...
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1answer
691 views

How to listen to all ports (udp and tcp) or make them all appear open in Debian

I got an external Debian server. The problem is that my university campus doesn't allow connections to go outside when the port is different than TCP port 22, 80, 443, or UDP port 123. I tested them ...
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0answers
26 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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2answers
789 views

Firestarter device not ready when booting Ubuntu

I am trying to get firestarter running on Ubuntu 11.10 and I am getting an error: Failed to start Firewall The device eth1 is not ready. Please check your network device settings and make sure ...
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3answers
47 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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7answers
26k views

Why does the Mac OS X firewall dialog recurringly pop-up and disappear by itself (without letting me respond) under Snow Leopard?

From time to time, I'll be on my Macbook using a program that accesses the network – whether Firefox, or Sony's Reader Library – really, it seems like it could happen with any program that ...
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1answer
53 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
4k views

How to access NodeJS server on LAN?

I'm not the most knowledgeable guy ever with networking, but here goes... I've created an application with NodeJS and I'd like to test the application on my LAN with my family. The application ...
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2answers
41 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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0answers
107 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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2answers
1k views

Windows 8.1 update service error code: 80240438

I updated to Win 8.1 recently and I've got this issue. In windows firewall I block all inbound connections and all outbound connections that do not match a firewall rule. I create a custom firewall ...
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2answers
2k views

Deny access to a port from localhost on OSX

I want to test a fallback strategy for my memcached driver (in case port is protected by firewall). How can I deny access to a specific port, on 127.0.0.1?
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0answers
105 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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1answer
282 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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0answers
64 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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0answers
124 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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1answer
254 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 ...
0
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1answer
48 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
130 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
242 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
55 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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4answers
57 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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2answers
249 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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0answers
20 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 ...
2
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4answers
9k views

iptables: Allow only HTTP access for web browsing

Have a linux box, want it locked down but just be able to surf internet on it. Why is this script blocking http too? #!/bin/sh # # iptables -F # #Set default policies for INPUT, FORWARD and OUTPUT ...
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0answers
35 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 ...
2
votes
3answers
2k views

Cannot connect to WEBrick on home network

I'm an Android developer and often my applications require server-side code. I typically use Ruby on Rails for the web app, and during development will run the server on my local machine (Mac OS X) ...
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1answer
696 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 ...
2
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0answers
1k 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
779 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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1answer
48 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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2answers
279 views

Blocking ransom-ware like Cryptolocker

Here's the scenario. We've got around 15 - 25 physical machines, a few virtual ones, 3 or 4 file servers, mobile devices - the works in a single domain. A user reported that they'd been infected with ...
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3answers
60 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
289 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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0answers
211 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 ...
1
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1answer
230 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 ...
2
votes
1answer
2k views

How to automate Checkpoint firewalls rules implementation?

I HATE CP with a passion beyond belief... I mean, why, WHY you couldn't include a command line interface that allows me to grep a CSV file in which I'm requested rules, format them properly and then ...
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0answers
139 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" ...
0
votes
1answer
140 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 ...
0
votes
1answer
187 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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1answer
703 views

Can't route into WAN with IPCop Router

i try to setup a IPCOP Router but i can't access the WAN from LAN but the LAN from WAN works fine. Example: WAN IP from IPCOP 192.168.1.130/26 WAN IP aliase from IPCOP 192.168.1.131 ... 190 /26 WAN ...
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0answers
40 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
36 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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0answers
44 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 ...
0
votes
1answer
194 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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1answer
494 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 ...