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

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29 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
28 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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0answers
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
19 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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2answers
321 views

Comodo Firewall blocks Cisco Anyconnect VPN

I am running Comodo Internet Security Firewall (6.3) and trying to connect to work using Cisco AnyConnect VPN client. I can make the connection but can't do anything else, not even ping by IP ...
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1answer
2k views

UDP blocked by Windows XP Firewall when sending to local machine

I work for a software development company but the issue doesn't seem to be programming-related. Here is my setup: Windows XP Professional with Service Pack 3, all updated Program that sends UDP ...
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7answers
21k views

Changing network type from Unidentified network to Private network on an OpenVPN connection

Is it possible to change the connection type in Windows 7? I have a OpenVPN connection which is identified as "unidentified network" and I do not want to apply certain rules to all unidentified ...
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0answers
16 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
31 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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1answer
236 views

Iptables limit user access time and mac

I am trying to create an iptable chain to kick my daughter off her ipad during the night. With the mac only filter I can block access but when I add time it no longer works. Does anyone see an issue ...
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0answers
9 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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2answers
48 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
31 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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1answer
2k views

How to open a port for all users: NSA 2400

I'm trying to open up port 8332 for all users behind my firewall but can only find instructions for doing so for a single IP address. How do I make sure all my users can use a specific port? I've ...
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0answers
17 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
11 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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1answer
5k views

How to setup firewall to allow internet connection sharing via Wifi USB stick?

I have a Windows8 computer linked to the internet via an ethernet cable ("Ethernet" network connection). I have attached to it a DLink Wifi USB stick, and I'm trying to share the main PC's internet ...
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0answers
37 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
326 views

Firefox location bar search: odd behaviour with Comodo firewall

I recently installed Comodo firewall, and it changed the behaviour of my Firefox location bar. I used to type something there and it either redirected me to a google search page or it actually ...
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0answers
30 views

What applications, if any, would stop working if you only had TCP and UDP? [closed]

Imagine that you had a normal home network without restrictions, but a firewall that only allowed UDP and TCP traffic from your LAN to the Internet. What applications, if any, would stop working with ...
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1answer
83 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 ...
0
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1answer
12k views

How to open a specific port in Moutain Lion Firewall

I cant seem to find how to open a specific port in the ML firewall? I know you can give applications permisiion, but thats no good to me. Is there a way I can specify a specific port?
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1answer
3k views

iptables trouble: nat with ip alias (virtual interface) not working

I'm setting up an Ubuntu 11.10 server to act as firewall for a network running several different SSL websites. The idea is fairly common: have all public IP's for each site aliased to the public ...
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1answer
45 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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0answers
7 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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1answer
42 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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0answers
25 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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0answers
13 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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0answers
39 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
2k views

Windows 2008 Firewall - How do I restrict HTTP inbound to specific IP?

My goal is to restrict all HTTP inbound requests to a specific IP addresses. I thought it would be a simple process - but I am not getting the result desired I have modified a predefined rule called ...
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0answers
11 views

iptables Rules gets reseted after Reboot@Ubuntu Server

I made a entry in blockfacebook table to DROP 173.252.74.0/18. Now, I tried to remove it using iptables -D blockfacebook 8 (173.252.74.0 is in the 8th line) and then I viewed the iptables ...
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0answers
16 views

So my ports randomly don't work anymore

Alright so I need a bit of help. I know how to port forward and such, it's easy. Just need helping troubleshooting it. So I usually host games when me and friends play. Was working fine maybe last ...
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0answers
23 views

Restrict Hamachi Gateway Scope / Ports

A client wants to make a couple of websites intranet-only, but still allow access at about 30 outside locations. Hamachi gateway would work nicely for this, but I do not want those computers to have ...
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1answer
26 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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4answers
11k views

Windows 7 is blocking ports

I am trying to open port 80 and 3690 for HTTP and svnserve respectively (inbound for both). I have Windows Firewall off, and have tried temporarily disabling Mcafee VirusScan Enterprise, to no avail. ...
0
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1answer
21 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
41 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
161 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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votes
1answer
36 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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votes
4answers
26k views

How to prevent a file from accessing the internet?

There are some .exe and .dll files belonging to some programs on my laptop which communicate with the internet without my permission (for self-update generally). I want to prevent those files one by ...
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1answer
22 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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0answers
25 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 ...
0
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1answer
68 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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3answers
2k views

Allow dropbox through windows firewall when everything else is blocked

Using this solution I've blocked all internet access with windows firewall and made an exception to allow local subnet traffic through the firewall. How would I allow dropbox through the firewall as ...
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3answers
974 views

Connecting PS4 through SonicWall TZ100 firewall | Sony Error NW 31162-3

I am attempting to Connect my PlayStation 4 through my SonicWall TZ100. I have below Ports Forwarded. I'm not great with Packet capturing, but as far as I can tell nothing is getting bounced that is ...
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1answer
6k views

Windows 7 firewall causing remote connection to time out; should refuse connection

The Windows 7 Firewall is running with default options to allow outbound connections and block incoming connections. I have a process trying to connect regularly from within my local network, which is ...
0
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1answer
49 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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2answers
466 views

Firewall in front of device with public IP address

Is it possible to have a firewall in front of a device with a public IP address without getting in the middle of NAT? I have a server that I need to put on the internet, but I want to put a firewall ...
2
votes
2answers
4k views

Detect what outgoing ports are bypassed by firewall

My school has a firewall which limits most outgoing ports. There're only TCP/80, TCP/443, TCP/21 allowed. Is there's a way to find out all the outgoing port allowed by the firewall? My current idea: ...
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2answers
882 views

Windows firewall blocks remote desktop with custom port

I was able to use my remote desktop with custom port when I was using Kaspersky Internet Security. Now, I have uninstalled my Kaspersky and switch to Avast!. Therefore, the windows firewall is turned ...