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 configure LAN IP Filter on Huawei E586 UMTS Modem

I need to prevent clients of an Huawei E586 UMTS to WiFi modem from downloading much data from specific servers eg. Windows update or OSX update. On the config page of the device there's an "LAN IP ...
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1answer
43 views

UDP port scanning

UDP is connectionless, so I can't expect a response packet, necessarily. If the port is closed, I might get an ICMP error message, but if the firewall could silently drop the ICMP packet How could I ...
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1answer
136 views

Process vsserv.exe attempts connection to unknown host (clients.your-server.de)

from past few day I notice a new connection is being made from my system, I discovered it within the outpost firewall, it is blocked by default with the reason Block Transit Packets in the image ...
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36 views

Opening a firewall port on virtualized Windows 7 running on Mac OS X 10.9

I am currently using a virtual machine running Windows 7 (32-bit) which is hosted by the VirtualBox application from Oracle; this latter is installed on a MacBook with the last up-to-date version of ...
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24 views

Local Network Addresses Visible to ISP

While I was on a support call with my ISP, their network engineer started listing IP addresses that were visible to him on my local network. He was right on the money as far as IPs that were up. I'd ...
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67 views

Output port redirect with firewalld?

I'm used to iptables and I can't find a way to do this with firewalld. I need to redirect the output traffic of one port back inside in the same port, basically this: iptables -t nat -A OUTPUT -p tcp ...
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3answers
47 views

I can ssh out but not in. Reversible?

I have an account on a server inside my corporate network. I also have a VPS from Linode. I can ssh from the corporate server to the Linode VPS or to my home computer with no problems. But thanks to ...
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1answer
6k views

How to open up firewall for incoming Remote Desktop connections in Win 7?

How do you open the Win 7 Firewall for incoming Remote Desktop connections? I get this message in System Properties:
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1answer
39 views

opened port on router for java socket

I am trying to make a peer to peer application and I want a port to exchange connection information and I want to ensure that this port would not be closed from the firewall on the way between peers ...
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2answers
28 views

VNC (or RDP) server using outbound connection only

How do I set up a VNC server that connects to an intermediary server to start an outbound communication, that can be used by a VNC client. This way the port forwarding doesn't need to be set up, and ...
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59 views

firewall detecting outgoing connections of weird hostnames

Recently, I am monitoring every outgoing connection with the help of my firewall. Sometimes when I want to connect to the Internet I receive alerts that some strange looking hostname is going to have ...
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19 views

I have a Windows Server 2012 which I would like to access only port 3389 and block other ports

I have a Windows Server 2012 which I would like to access only port 3389 and block other ports. Is this something that is doable? Maybe with the Windows Firewall?
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41 views

Cannot connect to tomcat on 8084

Tomcat seems to be running, but the browser cannot connect to it. Here is the netstat output. UC180375@UC180375-TPD-A /cygdrive/c/Programs/PortQryV2 $ tasklist | grep java.exe java.exe ...
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2answers
423 views

Prevent specific application from using metered network connection

Windows 8 introduces the new category of metered network connections. Applications that are aware of this type of connection can choose not to use it in an effort to reduce connection costs. I would ...
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3answers
367 views

Redirect ALL web traffic through TLS without a VPN

Assumptions: Server: I have a Debian Squeeze server, routable on the public Internet, with a static IPv4 address. I have unrestricted access to modify the software on the server. The server can ...
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3answers
44 views

Is the any way other then ping to detect internet connection?

I have a rails server (Linux). I can open the site with machine A. Using machine B I just can use ssh port to connect it, but it cannot open the site and the rails server cannot detect the http ...
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1answer
284 views

How to permanently disable firewall in Red Hat Linux

I have followed the below steps to disable the firewall in Linux. After reboot, again firewall is enabled. How to disable firewall permanently? Login as the root user. Next enter the following three ...
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19 views

Block all outgoing ports from iptables.

I have a windows xp machine running specific application which can be access by single port (27500). there is nothing else i want to access on this machine. If i block all outgoing ports from this ...
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38 views

Connect to VM to VPN through another VPN

My current setup is: My work desktop connects to our corporate VPN. I have a VM (Linux Mint) in VirtualBox that I am attempting to connect to another VPN (Private Internet Access). The VM in ...
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1answer
53 views

Portforwarding fails

I know how to portforward and I did it on at least 5 different routers at different places. But at home, it does NOT work. I can't figure out why. I tried different routers, even routers that I ...
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1answer
57 views

Can I backup and restore firewall settings on win 8.1?

Can I backup and restore the firewall whitelist on windows 8.1, independently of any other system settings??
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1answer
54 views

Open ports in Ubuntu 13.10 server

Im setting up a realtime gameserver fps-game, and then i need to configure ports. Just to mention, i will setup multiple servers for this game on the same ip address, which means i must open multiple ...
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2answers
2k views

Can't start firewall or automatic updates in Windows XP

On a friends laptop following some viruses infestations there is a problem in starting the Windows firewall. The error is: Could not start the Windows Firewall/Internet Connection Sharing(ICS) ...
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3answers
7k views

Filezilla won't connect

I am on a pc that uses filezilla. This pc is on a small network that has windows firewall installed. I de-activated windows firewall and I still cannot connect to my server. The details are correct ...
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135 views

Torrent ports and firewalls

I use this uTorrent program, under its settings 'Listening port' I set up a port of 46301, and also open that port in firewall. But whoever connects to me to leech, they connect to random ports ...
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58 views

tunnel all traffic of a p2p/DHT app through proxy to an external server

I am playing with http://telehash.org/ a protocol using DHT distributed hash tables, all its traffic is sent on a certain port (42424). And I want to do this while in my workplace where a ...
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1answer
74 views

IPSet with IP6Tables ERROR

Can someone please solve my headache and tell me how to fix this? [root@www ~]# ip6tables -I INPUT -m set --match-set blacklist6 src -J DROP ip6tables v1.4.7: Couldn't load match ...
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Blocking Incoming IP With Win 7 Firewall

This question was asked before, but the answer is not working for me and the rules of this forum say do not respond to answers, so I am asking again. I went through the following process on the Win 7 ...
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0answers
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What might be causing specific IPv6 HTTPS servers to send an excessive number of RST packets?

Client browsers on my IPv6-enabled home network hang and time out when attempting to load https:// URLs from specific IPv6 sites, such as ones operated by CloudFlare. In those situations, the live log ...
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2answers
129 views

How to enable Remote Assistance and add an exception for it in Windows Firewall from the command line?

I need to enable Remote Assistance from the command line. The equivalent of checking this box and hitting Apply. This is for automation and I tried editing the registry entry ...
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1answer
32 views

CentOS - ipTables

I have some questions about ipTables. Is it possible to open all ports between 2000 and 6000 and then have 2245, 5435,5434 closed? Is it possible to open some ports from a ip address? Eg. The only ...
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128 views

How to correctly configure iptables on a laptop?

I have run these commands (tried switching the order too) because I want to set up a firewall on my laptop so that nobody can connect to it (except of course in response to a connection I've made): ...
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2answers
3k views

Cannot connect to my mac via SSH

I want to open a connection to my mac (10.8) via SSH. An SSH-server is installed by default on OSX. Remote login is enabled, so the service is running and I can connect to to localhost via ssh. ...
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2answers
781 views

Running a webserver behind a firewall I have no access to

I'm having a bad time in my student appartment: I want to run a webserver on my Laptop, which should be reachable from outside of the net. I'm sitting behind some proxy-server that passes outgoing ...
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51 views

How to force Remote Desktop via firewall rules to use LAN instead of WLAN?

WLAN has higher priorities than LAN but Remote Desktop seems to still use WLAN. I tried to achieve this by setting up a firewall rule but this does not seem to do the trick. Here is what I tried: ...
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21 views

Why can I not block certain applications on Windows 7 Firewall?

The situation is this. I open firewall.cpl in the start menu and I'm trying to block a specific application from accessing the Internet (one which wasn't present on the list, I might add--so I added ...
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2answers
1k views

How to block all websites but a few with Windows 7 Firewall

How to block all websites with Windows Firewall, and then allow a few websites to pass?
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port forwarding in windows

I need to forward all incoming traffic on specific port to another port on the same device "locally not proxy", and all outgoing port traffic. in Linux it is possible using iptables I used NAT chains ...
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2answers
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Is it possible to put UFW on CentOS?

If so, how would I do it? If not, is there an easier way to set some basic rules on CentOS other than iptables? I'm more of an app developer and less of a sys admin.
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3answers
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what is the purpose of the `unlock` command button of `gufw`?

gufw is the GUI version of Uncomplicated Firewall. What is the purpose of the unlock command button of gufw? This command button disappears once it is clicked. My configuration is Ubuntu 12.04 with ...
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4answers
646 views

Remote into Linux workstation behind a firewall using NoMachine or other remote desktop service

My question is very similar to this question: Remote into Linux workstation behind a firewall My work has firewall and ssh server. The ssh server is listening to the default port 22. Normally I ...
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1answer
625 views

Can a people DDOS a block Port?

The title says it all, I've search around the net but no avail. From what I understand, DDoS is a distributed denial of service attack, where multiple people sent a huge request at a same time which ...
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0answers
87 views

Windows firewall blocks internet connection for application from network share

this is my setup: Windows 7 home premium Windows firewall with inbound and outbound traffic blocked by default, file and printer sharing and some basic Windows services allowed Tinywall to control ...
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1answer
306 views

Windows firewall - block all incoming connections enable/disable - CREATE SCRIPT

Is it possible to create script which enable/disable the first checkbox of windows 7 firewall settings (Block all incoming connections....)?
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1answer
45 views

Permanently add a firewall exception on Windows 7

I'm using Windows 7 32-bits and on every start-up, a Windows security alert popup is displayed and I need to authorize the programs to access the network. If I accept the popup, the program can ...
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1answer
140 views

No Internet Connection on using Buffalo WHR-G300N

I have used the Buffalo WHR-G300N over 2 years while I will use it for connecting all of my devices to Internet @ home. However, two days ago, I have the issue that the router suddenly disconnected ...
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1answer
242 views

Opening a port on CentOS server not working externally?

I am trying to to setup a Ghost blog instance on port 80 of my CentOS 6 virtual server. There are no pre-installed web servers occupying port 80. If I run Ghost in production mode as a background ...
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0answers
25 views

Programming the firewall on a Siemens router

I have a Siemens ADSL SL2-141 router. From the web interface, I can program the firewall (e.g. block/unblock IP addresses). I want to do the same programmatically via telnet. But, when I ask for ...
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Is it possible to restrict access to certain URLs for individual programs?

I have a certain use case where I want to whitelist a list of URLs that a certain application can access. In other words, I want to sandbox it, but don't have access to blocking or white listing those ...
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Does the Virtual PC XP Mode need safety measures?

Does the Virtual PC XP-Mode (or any other virtualized mode) require safety measures, such as antivirus or a firewall? I'm just wondering if the XP-Mode would be a large security loophole, since it's ...