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

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how to save iptables rules permanently?

I want to keep some iptables rules permanence, so I just only add the rules manually: /sbin/iptables -I OUTPUT -p tcp --sport 80 -j QUEUE I am sure that the command works, because I could see it ...
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26 views

What does it mean if a public IP address looks like a private IP address?

For example, I go to http://whatismyipaddress.com/ and it tells me that my IP address is 192.X.Y.Z. What does this mean? Isn't that a private IP address? How can I find my real public IP address? ...
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9 views

Firewalld - allowing ICMP in custom zone (centos 7 / redhat 7)

I want to enable ICMP echo-reply in a zone defined by source. I have a zone MONITORING where I want to permit some services like mysql and echo-reply. Permiting services like mysql is simple, but I ...
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4 views

How to portforward in Tenda TEI480T+

I just want to ask if anyone has a tenda router TEI480T+ dual wan. I have a problem regarding in portforwarding (virtual server in this router) because even I already added the IP address of the PC ...
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1answer
15 views

netsh advfirewall open TCP ports 80 and 443 for outgoing traffic

I need to do the following with netsh advfirewall commands: Open TCP ports 80 and 443 for outgoing traffic to dc.services.visualstudio.com and f5.services.visualstudio.com. How can I do this?
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14 views

iptables INPUT command

On a ubuntu1, this is iptables command: sudo iptables -A INPUT -p icmp -j DROP so on the other computer (xp1) I can not ping the ubuntu1.So this is OK. But On ubutnu I [[ can ]] ping xp1. and I ...
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20 views

Always allow a program to act as a server

I'm coding some small application. Basically it listens for incoming tcp connections. I always get this screen: I always press the accept/allow button but it keeps asking every time I start the ...
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7 views

Disabling SPI and QOS on my router for another feature?

Well, I purchased a D-LINK DIR-655 model C router and I really like it so far. The only issue I have is that there is a function called "True Gigabit Routing Connectivity" that does this When this ...
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15 views

Is blocking / allowing by IP using .htaccess (or equivalent) enough to secure a resource on a web server?

Currently in the process of setting up a web infrastructure to host my web application where security is the most important factor and I need to be able to allow only specific IP addresses to a ...
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11 views

Firewall is blocking packets for hMailServer

I installed hMailServer on a Windows 7 (SP1) machine for mail delivery only inside a local network. After configuring a pair of mailboxes, I also configured a Thunderbird client in the same machine ...
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8 views

automatically set all inbound rules scope to a local subnet? [closed]

I don't have any ports open in my router, so there is no reason why in my windows 7 firewall, any of my inbound rules should allow a remote ip(the ip of computers allowed to make an inbound ...
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1answer
14 views

Clients unblocking AWS S3 Content on their firewall

I have a website that serves out user generated content from AWS S3. I have a client that wants to use our website from behind a firewall. They are asking me to provide them with a static IP Address ...
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5 views

Change the insecure default to restricting scope to LAN, for adding exceptions to the windows 7 firewall?

My network is generally set to Home or Work, i'm not commenting here on Public. I understand that with Home or Work, the Private firewall profile is used. I have noticed that with the Windows 7 ...
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16 views

What settings are required for VMware Workstation shared VMs to be accessible with ZoneAlarm Free Firewall installed?

I have Workstation 11 installed on a Win 8.1 Pro system. I just installed ZoneAlarm Free Firewall 2015 and now can no longer access my locally shared VMs, either from the machine they are installed on ...
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15 views

Can softwares access internet through svchost without firewall attention

Can softwares access internet through svchost without firewall attention? I have added one of my programs in the Kaspersky's firewall and I set it to deny access to internet. But now I think it is ...
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16 views

Cannot open port 25565 and others

I try to open my Minecraft server and my gmod server ports. Now I only try Minecraft and I tried to open in 192.168.1.1 in Windows firewall. I went to this site: ...
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19 views

Which ports to open in order to access a Windows Server 2008 shared drive through VPN?

There are two servers, A and B. The networks of those servers are connected through VPN. Each network is protected by a firewall and all ports are blocked. I am the owner of server A, and ...
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1answer
48 views

Block all Outside IP addresses to NAS using Winbox/Microtik

I am not an expert on networking and firewall rules. I can use the Microtik/Winbox app to the point where I can setup basic firewall rules. I want to basically block all outside IP access to my NAS ...
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34 views

Connect to nodejs through public ip address

I have a basic node express app running on port 3000. I can access it via 127.0.0.1:3000, my private ip is 192.168.1.2 I've set up portforwarding in my d-link router as followed: Private IP ...
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39 views

Ports not opening correctly

I am trying to open up ports to run a program but it won't work. I am trying to open up port 80 for testing, but even that didn't work. Here are the steps I'm going through. Open windows firewall, ...
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1answer
72 views

Google chrome keeps crashing: possible conflict with comodo firewall?

I've used chrome for years, and comodo firewall and HIPS protection for some months, but suddenly google chrome started crashing as soon as it was loaded. I tried to reset my user profile and ...
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24 views

How can I control specific traffic like UDP traffic with iptables on ubuntu?

If for example I would like to send just the UDP traffic to an IP-address, is it possible to do this with iptables ?
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28 views

Connect 2 Networks and restrict acces

The Setting: 2 apartments where each has it's own internet connection over an AVM Fritz!Box. I'd like to connect both apartments with a network cable. In apartment 1 is a NAS wich should be ...
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1answer
41 views

linux: how to troubleshoot forwarded port?

My home internet connection has a static IP address (eg: 123.123.123.123) I have configured my router to forward port 9000 to an internal host (192.168.1.101), which is running Ubuntu 14-04. I run ...
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22 views

How to debug “SIP registration failed”?

My SIP phone, which I use from Turkey with a virtual UK number, has recently stopped working with "SIP registration failed" and the supplier of the UK number has told me the times of the last ...
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1answer
45 views

How to open a firewall port in Windows using Power Shell

I would like to know how to open a firewall port in Windows by using Power Shell.Could anyone write a script for opening a firewall port.I saw a similar post on ...
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20 views

Route Windows application to specific network interface

I have two connections (one wired, one wireless, if relevant). One connection passes thru a proxy (which is not under my control) and is domain controlled. The other is a simple wireless connection ...
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32 views

Connections from virtual host to internet OK, but to rest of LAN, broken

In a notebook running Ubuntu 14.04 I have installed VirtualBox and created a virtual server with Windows 7. The PC is connected to a 192.168.x.y LAN. The virtual server is in a host-only network with ...
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1answer
12 views

Windows Server 2008 firewall not allowing a port range

I have a windows server 2008 SP1 Datacenter instaled on my PC. My problem is that windows firewall is not accepting port ranges, like 2300-3000, 5500-6000 and so on.. Here is a similar image from my ...
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44 views

iptables snat does not change source IP

I am on ubuntu (with IP 10.0.0.1) trying to snat packets going out from port 9090. I want to change the source IP to 10.0.0.2 I have added the following rule through iptables: # iptables -t nat -A ...
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1answer
47 views

Windows8, website “blocked” .. or something, very weird issue

Run into a very weird issue on my Windows8 laptop tonight, which honestly left me baffled. When I try to open battleping.com in the browser, either Chrome or Firefox, they don't load, and timeout ...
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11 views

A Linux Firewall/Web-proxy suited to a blacklist-by-default policy for a single desktop

I am looking for a (suite of) tool(s) to strictly control outbound access to a small whitelist of globally deployed web-sites, for one Linux desktop (with one user). I am looking for a solution with ...
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42 views

Settings for printing remotely over the internet to HP Laserjet from one IP address

I'm trying to print from an Amazon/AWS EC2 instance running WinServer 2008 R2 to an HP Laserjet on our network. These are the steps taken so far: On EC2, the server services ‘LPR Port Monitor’ and ...
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18 views

How add rules to windows Firewall?

How add rules to windows Firewall? I have problem to receive UDP broadcast packets from one of my computer. I am able to receive the broadcast with same exe from another computer after same router. ...
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1answer
53 views

IpTables -j REJECT to instantly block the loading on user browser

I have been searching for a solution to notify the browser on user that the request is Rejected so stop loading it. Because I have blocked facebook and every page that have a facebook plugin is ...
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1answer
172 views

Block websites to a certain IP range with mikrotik router

I have a MikroTik Router 951Ui-2HnD that connects my computers with the ISP. I want to block Youtube and Facebook but only in a few computers. I created a Layer7 Protocol with: Name : Denied Websites ...
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1answer
106 views

Redirect traffic through port 80

My situation is as follow : I have a client on a network where only port 80 is open. I'd like to be able to connect to a FTP (port 20 - 21) from this client. Is there any way to redirect ...
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1answer
46 views

Log file for ssh attempts?

I have an old Macbook running Yosemite which I've connected to the internet via my college network. I foolishly enabled ssh access while my computer had a weak password, and now I want to check my ...
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2answers
49 views

Control communication flow between devices on a network

For simplicity, let's say my network looks like this: [Internet/Modem] | [Standard home wi-fi Router] | [Windows/Mac PCs] ...
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1answer
27 views

IPTABLES NAT port forwarding

I'm trying to setup a Linux box to act as a very simple 2 NIC router. I've read over the instructions on the bot Archlinux and Gentoo wikis and gotten the same result, masquerading works but not port ...
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1answer
46 views

Recommended protection from inbound traffic and set up of 3 vlans on home network [closed]

There are so many questions out there on this topic without the answer I'm looking for. They talk about basics like WPA2 and how to get neighbors to stop using their Wi-Fi.... Perhaps I don't know the ...
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1answer
322 views

How can I configure my firewall to block Abobe Illustrator CC 2014 updates on Windows 7?

I have a very simple question. How can I configure my firewall to block Abobe Illustrator CC 2014 updates on Windows 7? I would like to do this properly. Thanks.
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1answer
29 views

Trouble with last DROP rule in iptables

Let's say I want four ports to be opened for any incoming packets so I made this ruleset: #> iptables -L -v Chain INPUT (policy ACCEPT 20 packets, 1190 bytes) pkts bytes target prot opt in ...
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35 views

iptables do not block all traffic i want to mysql port

Need to block all incoming traffic to port 3306 but two ranges. The thing is I can connect from other ranges anyway!. Think my drop rule is ok. Why is this? ]# iptables-save # Generated by ...
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1answer
38 views

What is a stateful firewall and how does it work? [closed]

Could someone, please, explain what a statefull firewall is and how it works? Also, it would be helpful if you can compare it to a stateless firewall.
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1answer
84 views

firewall blocks connection even though allowed

i am unable to make any connections whatsoever to my windows 7 machine from another machine on my network. when i turn the firewall off, i am suddenly able to make these connections. one such ...
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1answer
97 views

Telnet cannot connect to localhost on port 23

I am using bat file assigned with vbs script to change router configuration every 15 minutes through the day through telnet commands. It works as supposed for a while then it shows this message "Could ...
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34 views

Open firewall port on Mac OS X

I need to open port 8181 on my Mac OS X. On Linux, I would do: iptables -t filter -A INPUT -p tcp --dport 1664 -j ACCEPT iptables -t filter -A OUTPUT -p tcp --dport 1664 -j ACCEPT How do I do this ...
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88 views

License Manager for Matlab is unable to connect to the license server. License Manager Error 96

I am using Matlab R2014a. The license has been provided by the college. As soon as I launch the software, I get a following error message. I tried to ping the server addresses, and the were ...
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4answers
566 views

How does a firewall contribute in mitigating IP spoofing attacks?

I understand that you can implement a firewall to only allow access to a server from specific IP addresses, but can't people fake the source IP address in a TCP packet? How does this actually stop ...