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

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Advantages of Multi-Tier and Multi-box firewalls?

I'm currently doing a University project and am having trouble getting my head around a few concepts. One reason is the looseness of terms in IT, with network tiers referring to several things ...
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17 views

Force users pass by firewall for a network with 2 gateways, one over firewall and other direct connection

I have a network with 2 default gateways (i.e. A, B). A is behind a firewall, while B is directly connected. I set DHCP for all domain computers to have Default Gateway for A. The firewall is a proxy ...
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39 views

How can I open a port in my Mac OS X yosemite(firewall)?

I have a java-based server(jar file) and it is running on port 8080. It is running well on my localhost, but I can't access it through other networks I think it's a firewall issue. so, First, I ...
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25 views

Cannot connect to server, error message says “java.net.ConnectException: Connection refused”

I have been trying to get a minecraft server running for some time now to no avail. I apologize for the fact that this is not as technically advanced a question as is intended for this forum, and that ...
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7 views

Mikrotik: One firewall rule for multiple chains?

I created multiple firewall rules for input chain as described in an article and now it seems that I need to create the same set of rules for forward chain. Could I make a rule for multiple chains?
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1answer
20 views

How to block website from MAC in the verizon router firewall settings

I've tried searching for how to configure my verizon router firewall to block certain websites but nothing seems to be working. Picture of what I've done here I did an nslookup for youtube.com and ...
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1answer
16 views

Stateful Firewall

I am a beginner in firewall and trying my hands on stateful firewall rules. I do understand that with stateful rules, the first packet is inspected as per the rules but subsequent packets that belong ...
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2answers
22 views

Use iptables to block local connection

I wish to block all connections (local and remote) to a service running on a particular port, say port 1000. I have tried the following command: iptables -I INPUT 1 -p tcp --dport 9999 -j DROP ...
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14 views

502 bad gateway after putting up firewall nginx

My server was working, then I added a firewall for a bunch of ports! And now I get the error: 502 Bad Gateway nginx/1.4.6 (Ubuntu) Nginx server { listen 80; server_name 45.79.80.140; ...
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15 views

Windows 7: Block an entire folder from accessing the internet (outbound)

Every time I need to block an application from accessing the internet I do so by creating a rule (firewall) for a specific EXE file (or other). Usually there are multiple programs in one folder and ...
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1answer
28 views

Program to block an IP temporarily with iptables

Is there a program on Debian to block an IP address temporarily just by launching a command (specifying the IP and the duration)? With iptables/ip6tables alone I can create a rule, but I would then ...
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31 views

Allowing port access on Windows

I have a message broker running on my computer on port 1883. I tried to telnet that port (to test its accssibility) from a computer on the same network but that didn't work. How can I allow other ...
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How to setup firewall ports via logon script

I work as IT suport for public service. We use domain controller and logon scripts. These scripts are pretty helpful, since they can automatically install printers and add network folders as local ...
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40 views

How can I block my PC from receiving/sending any communication with Russian IPs? [closed]

I recently had a scare when a Russian scammer was able to download a keylogger to my PC when I clicked on a game invite sent to me via steam (they cloned a friends account so it looked genuine). Now ...
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25 views

How To Configure Portforwarding with iptables

I have got a "Hypervisor" witch has two interfaces: eth0 Link encap:Ethernet Hardware Adresse d4:3d:7e:fc:b2:db inet Adresse:87.25.34.251 Bcast:87.25.34.255 Maske:255.255.255.192 ...
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10 views

Turning extra 6 LANS into “router” like links using Sophos UTM 9

Hey all I just finished up setting up the UTM 9 Home edition and I currently have it up and running with eth0 as the WAN and eth1 as the LAN. However, my motherboard has a total of 8 Ethernet ports ...
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1answer
22 views

Port Forwarding with 2 NICs via Windows 7 firewall

I have a computer with two network cards, each of them connected to a separate network. I would like to forward all requests that arrive via port X from one networks to port Y on a host in the other ...
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18 views

what steps should I take to correct “Windows Firewall is incorrectly configured” when troubleshooting homegroup issues?

I'm trying to get two computers to connect via the Windows Homegroup. When I run the troubleshooter I see this message: . How should I go about fixing this? Most tips on the web say that you need to ...
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24 views

Blocking whatsapp / IM apps on Windows 7 firewall

I'm using a hosted network which I created and shared the local internet with it. netsh wlan set hostednetwork mode=allow ssid="OWNWIFI" key="12345678" netsh wlan start hosted network So I'm trying ...
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4answers
30 views

can I add a hostname that is reachable everywhere?

i'd like to assign a hostname to our database server that is reachable from both outside and inside the building. Let's say we own a domain at godaddy: ddd.com i'd like our staff to reach the ...
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0answers
11 views

Configure huawei E5172s-920 To Use a Host As a Firewall

I want to use a linux machine in my LAN as a firewall so that all traffic in the LAN must go through that machine.But, There no option to use a host as firewall or for setting up a proxy in E5172s-920 ...
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2answers
34 views

Intrusions in router firewall

Intrusion -> IN=atm8 OUT= SRC=(random ip) DST=(my ip) PROTO=UDP SPT=123 DPT=80 I'm seeing multiple of these in my router's firewall log, I replaced the actual ip from the example given above. For ...
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21 views

is it possible to use certificates on windows firewall?

Scenario: I have a situation where I work from home. I need to connect to a database server on the internet. The server has whitelist rules for IP addresses on firewall. My IP address changes ...
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1answer
34 views

PF: Can't open port on OS X

Have troubles opening the port 9 on os x 10.10.3 yousemite using pf firewall. I want to do this for being able to get wake-on-lan packets to this port. I assume that for WoL to work the port (on the ...
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1answer
30 views

A secure, iptables rule-set for Ubuntu home router

I am using a Ubuntu 14.04 server machine as my primary home router and firewall. It has DNS, DHCP and uses iptables to secure everything up. Iptables also acts as a nat. On eth0 I have my incoming ...
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51 views

OS X Yosemite. How to block internet access for specific app? (AppStore for example)

How to block internet access for specific app (AppStore for example) in OS X Yosemite, via CLI or GUI?
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22 views

Chaining one router to another plus a switch

So I have a hardware firewall running OPNsense, a dumb switch, and a router. Could I run the output of the firewall through the switch, have the firewall do DHCP for those running off that, then ...
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65 views

Can I set up Windows 7 VPN so that only sites blocked in China are routed through VPN?

I'm in China behind the Great Firewall using a VPN service provided by a friend so didn't get blocked in the VPN crackdown in January 2015. Since VPN can slow down traffic a lot I'd like to only ...
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1answer
43 views

How does my computer's firewall work? Like inbound rule, outbound rule, reply?

So I understand how NAT works, but I don't understand how firewall works. With non-symmetric NAT, if someone sends me a packet, it gets blocked, but it I send someone a packet and they get that packet ...
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1answer
14 views

Can I inherit iptable rules on/under windows?

Don't really want to purchase a VPS just to test some iptables stuff for my gameserver. Was curious if it's possible to load up debian on vmware player and install nginx, nodejs, mysql, etc (which is ...
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17 views

How to find allowing/blocking rule in Windows Firewall

I'd like to find which of the rules in a Windows Firewall is allowing or blocking some traffic. Specifically I'm trying to allow only certain IP ranges access to my server, but I've discovered that ...
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Iptables: dropping/rejecting new and invalid connections

I'm very new to iptables and my goal is the block NEW and INVALID connections on the INCOMING chain and log any attempts for a NEW connection. I'm also letting any and all traffic out on the OUTGOING ...
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1answer
51 views

SSH Server Not Responding To Connection Request

I'm attempting to set up an SSH server on my local machine using OpenSSH. When I try to SSH from a remote host into my local SSH server, the SSH server doesn't respond and the request times out. I'm ...
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18 views

How To Apply Firewall Rules to VPN Traffic Leaving A Mac Server

A Macintosh client successfully connects to the VPN service running on my Yosemite Server. They get an IPv4 address and everything appears to be working normally. Is it possible to restrict the ...
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15 views

Is there a test/lab environment for Sonicwall firewalls?

Does anyone know if there is a test/lab environment for Sonicwall similar to that of Cisco's Packet Tracer ? I am trying to find a way to simulate some changes without tampering with my production ...
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1answer
38 views

OSX Firewall keeps asking for approval

I'm in the midst of moving from one Mac laptop to another. I decided to start from scratch and install everything by hand to avoid the cruft I accumulated over the years. My old laptop is on Yosemite ...
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39 views

Which port do I need to open?

Currently we have a bit of a dodgy setup with our firewall, and are using an ngrok program to effectively punch a hole in out firewall to allow a program through (jvue). Unfortunately, this is the ...
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33 views

VMWare Workstation on Windows7, Firewall Issues

I have a Ubuntu image running under VMWare Workstation 11.1 on a Windows 7 pro machine. This VM image is there in part to serve some files over TFTP to a number of hosts on a network. The tftp server ...
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43 views

Draytek Vigor 2925 outgoing connection

I have a Draytek Vigor 2925 at home. I use it for my home network an especially the VLAN option is nice, because I need to have multiple "seperate" networks. I have a strange problem, I'm not able to ...
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24 views

CheckPoint Firewall Comand Line Login fwpolicy.exe

Is there a way to use command line to login to CheckPoint Smart Dashboard with the fwpolicy.exe tool ? How do I look at the help pages or manpages ?
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238 views

Is there a way to stop websites on an Apache localhost web development server from accessing the Internet?

I am using Uniserver for PHP web development and I am running windows 8.1 and have Kaspersky installed on system. Most of my work involves working on WordPress websites. Wordpress core files and ...
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2answers
59 views

Passing through a firewall with a “reverse” proxy

I have to do a workshop in a firewalled environment which is preventing me to show everything I would like and I'm looking for a workaround. I'll be demoing a software which runs on Windows. During ...
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21 views

UDP over Internet

I have a small problem: I want to program a simple Apllication that sends a small word (in this case: "Hello") to a server. This Server should display it via cout. This is just a project to learn how ...
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1answer
25 views

How to white list some ip and all the rest block while having already a DMZ?

I have a Linux machine running which has local ip: 192.168.1.2 connected to a router with public IP 8.8.8.8, now the router 8.8.8.8 has DMZ to 192.168.1.2 As a result spammers, hackers, crackers ...
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Why do my nat iptables rules not work with marked packets?

System: debian squeeze, Linux server 2.6.32-5-amd64 #1 SMP Tue May 13 16:34:35 UTC 2014 x86_64 GNU/Linux, iptables v1.4.8 lsmod | grep iptable iptable_security 2176 0 iptable_mangle ...
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64 views

How can I make Ubuntu firewall rules ( ufw ) allow all traffic except…?

I'm new using Ubuntu and ufw command to set firewall rules. I have an apache service running and I'm able to deny the access to the root path using apache2.conf. I have another backend app running on ...
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1answer
18 views

Can't connect to SAMBA - ISP is blocking it

Security issues aside, I'd like to connect to a SAMBA share from home to a server (dedicated or vps, doesn't matter). The server works perfectly. The issue is on the client side. Let me more clear: ...
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1answer
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about CentOS 7 apps & Driver [closed]

im using pc for several years but never tried Linux so im quite noob in this field. im using Autodesk maya, Nuke & will learn houdini very soon. i found that linux works faster for this apps so ...
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1answer
93 views

Firewall Throughput vs. UTM Throughput

I want to buy a new rack-mountable router with wireless capabilities. I was checking out the (Netgear UTM-25S. This router has a "firewall throughput" of 980 Mbps but a "UTM throughput" of only 24 ...
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3answers
116 views

Vyatta Firewall structure and Interface Direction

I've just purchased a Ubiquity EdgeRouter ER-8, and I'm working on configuring the firewall. In particular I'm confused about the direction "Local" for the interface I've defined as the WAN, and how I ...