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

learn more… | top users | synonyms

0
votes
0answers
23 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, ...
0
votes
1answer
21 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 ...
0
votes
1answer
18 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 ?
0
votes
0answers
25 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 ...
0
votes
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 ...
0
votes
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 ...
-1
votes
1answer
30 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 ...
0
votes
0answers
8 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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
0answers
24 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 ...
-1
votes
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. ...
0
votes
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 ...
0
votes
0answers
37 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 ...
1
vote
1answer
82 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 ...
-2
votes
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 ...
-1
votes
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 ...
0
votes
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 ...
1
vote
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] ...
0
votes
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 ...
0
votes
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 ...
1
vote
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.
1
vote
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 ...
0
votes
0answers
24 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 ...
-4
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.
0
votes
1answer
67 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 ...
0
votes
1answer
48 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 ...
0
votes
0answers
25 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 ...
0
votes
0answers
48 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 ...
0
votes
0answers
15 views

Using a Barracuda F400 Firewall Router Without a Modem [migrated]

I'm looking into a problem where VoIP phones don't ring for some of the incoming calls that I believe might be due to the network configuration. Do you need a modem if you are using a Barracuda F400 ...
3
votes
4answers
555 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 ...
0
votes
1answer
38 views

Lync keeps dropping because of D-Link DIR-601 router. How to configure firewall to fix this?

I saw this article, and it's exactly my problem, but my settings are a bit different and nothing seems to have fixed it so far. Why does my D-Link Router keeps dropping my Outlook and Lync ...
0
votes
1answer
43 views

Limit Netgear Nighthawk AC1750 to given WAN IPs

I have a Netgear Nighthawk AC1750 router, and have SSH, HTTP, and several other ports forwarded to a server. It is not for public use, and will only be accessed by me. I've recently had 60,000 hits ...
0
votes
1answer
74 views

Windows NTP Client Not Syncing with my ESXi NTP Server

I have an ESXi 5.1 server configured as a NTP server and a local Windows Server 2008 R2 PC that aren't syncing. I've read that whenever an ESXi server is run as a client, it also acts as a server, so ...
0
votes
1answer
29 views

iptables on debian blocking git pull, http api requests etc

I am using IPTables on an API server to block all incoming traffic except for SSH, HTTP and HTTPS. I need to have full access on the loopback interface to run beanstalkd amongst other things, and need ...
0
votes
1answer
14 views

Should I allow or deny helpd file to establish connection in my Firewall on Mac OSX 10.8.5?

As in the subject line. Should I allow or deny helpd file to establish connection in my Firewall on Mac OSX 10.8.5? I would appreciate answer to that and more elaborate answer what exactly "helpd" ...
0
votes
1answer
48 views

How to whitelist (Windows Firewall) a program using the Java runtime?

I am using Windows Firewall on a Windows 7 laptop to block outgoing connections by default. I want to allow SurveyCTO, which requires Java, to sync with a remote server. Even with "Allow" rules for ...
0
votes
0answers
11 views

Making a server “read only” except for me (what the inbound/outbound rules mean)

I have an ec2 instance. It will start a webserver, and my public ip is myip. I ssh into my machine. What should incoming and outgoing rules? Why? I want only my ip to be able to change things on the ...
0
votes
0answers
17 views

Database showing a list of current vulnerabilities?

I have been recently building my own firewall, but I was wondering is there a website or database which lists majority of the known vulnerabilities so I could obviously update my firewall based on the ...
0
votes
0answers
10 views

vSphere Directpath NIC isolation

I am building an home server, and I am planning to use VMWare vSphere to create multiple OS that will have precise tasks on the server. On the server, I'd like to have a firewall-antivirus using ...
0
votes
0answers
102 views

Can't telnet to port 3389 on computer on same network

I have two Windows 8.1 pro computers on the same network using the same FIOS router. On the first computer, I can telnet to localhost 3389. On the second computer, I can't telnet to the first's IP ...
-1
votes
1answer
38 views

Isolate computer network card from main OS

I am starting a project with my old computer, planning to make it into an economic multifunction server, but I am new to networking, servers, virtualization and firewall-Antivirus-Anti-spam software. ...
1
vote
1answer
76 views

How can I block ads on Windows 8.1 Book Reader? [closed]

When I read epub books using Windows 8.1 Book Reader, I see ads at the bottom of the screen. I have tried to change settings in the default firewall included with Windows to no avail. I downloaded ...
0
votes
0answers
10 views

Can you add a proxy exception with an exception?

Is there a way to add an proxy exception with somewhat of a case match so to speak? so say I want to allow all https, I would use: https://* but I dont want it to apply to https://testsite.com ...
0
votes
0answers
33 views

Turning off windows firewall

I did the most idiotic thing I can think off: created a firewall rule for a windows azure VPS to block all incoming traffic, on all ports. Now I can't access the VPS, obviously. Any idea how to ...
0
votes
0answers
45 views

My router bypass the DNS servers I manually entered

I wanted to change the default DNS so as to use OpenDNS ones. I went to the router (192.168.0.1) and then put the DNS adress of OpenDNS in the WAN connection settings. It works and my computer ...