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

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Set up port forwarding on Ubuntu with ufw

I want to route HTTP traffic from port 80 to port 8080. I added the following rule to /etc/ufw/before.rules -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080 But it works only if direct ...
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58 views

iptables - How to mirror all ports from one IP to a single port on another IP

I would like to set up IP tables on my router to mirror traffic on all ports from 192.168.1.30 and send it to 192.168.1.10:5860 I think I need to combine the two commands below, but I'm at a loss. ...
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31 views

set Cisco SPI firewall to high, but allow SIP traffic?

How can I set the SPI firewall settings to "high" for the router, and yet allow SIP traffic? If I set the firewall to medium, the call will connect but I don't hear anything.
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1answer
10 views

logs are showing a succesful handshake but not connecting

I am using putty on windows to connect to an external ubuntu box: putty.exe mylogin@somewhere.com -pw mypassword The logs from pfsense are showing that it allowed this traffic to pass; however, I ...
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93 views

Why CSF blocking all traffic?

I've installed CSF firewall with Directadmin. when the firewall is running, it blocks all the incoming and outgoing connections. My iptables -L -n: Chain INPUT (policy DROP) target prot opt ...
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66 views

What are some ways to disrupt BitTorrent activity in OpenWRT? [closed]

My Internet subscription belongs to me in name, so I need to make a best effort to prevent housemates from getting me flagged for illegal BitTorrent activity. I read that deep-packet inspection is a ...
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1answer
111 views

firewall-cmd in CentOS 7

I have a virtual linux server from STRATO. This machine runs CentOS 7 and when it comes to firewall settings I can read everywhere to use firewall-cmd. My system has no command available named like ...
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1answer
131 views

Why Windows Firewall does not block outgoing traffic?

I have noticed that Windows Firewall only blocks incoming traffic, for example, if I tried to listen on port 12345, it will display a warning dialog asking me if I want to allow it. However, if I ...
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55 views

csf (config server firewall) with nginx

I am looking into various web server solutions, and have come down to nginx and apache; I'm fairly ok with the technical differences and the pros/cons of each and if it was just down to that I would ...
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2answers
71 views

Windows 8: want to force a specific website be opened only by one of two internet lines avialable

I have a PC with win 8 with two different available wifi internet lines available. I want to to force a specific website be opened only by only one of internet connection and other websites be opened ...
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47 views

Can Windows Firewall be hole punched?

If you send a packet to someone's router, it will most likely be rejected by either the router firewall or the router's NAT (if no port is forwarded). However, for a short time, your router will ...
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1answer
973 views

I suddenly can’t access my own web server within my LAN via the external WAN IP address

Suddenly today—without explanation—I cannot access my web server from my local network. My router is an Actiontec MI424WR MI424WR (GigE for Verizon FiOS). I have verified that no browser running on ...
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35 views

SonicWall firewall setting up RDP

I want to setup an RDP connection from the outside into my network I have a SonicWall NSA 220 what is the process involved? How secure is this option? are their other options available to this device ...
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26 views

How to log HTTPS traffic

I want to log https traffic of my network without loosing certificates trusts and without a proxy. I need to log "only" source ip, remote hostname and data traffic amount. Should be easy to get ...
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1answer
58 views

Blocking a specific application's access to a specific domain

I want to block a specific application's access to a domain. I would normally do this by adding the domain to my hosts file and having it redirect to localhost, but that will disable all applications' ...
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95 views

Exporting raw data of Checkpoint Firewall

I am looking to export a Checkpoint configuration to a Excel document (HTML or XML would also work). However, one requirement is to have the configuration showing the rule base with IPs ONLY (no ...
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132 views

Windows firewall rule order?

I'm trying to setup Windows Firewall to allow all traffic except a large list of IP ranges connecting to/from a specific application. For testing, I set up two rules: Allow all traffic (no ...
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74 views

how do I establish whether Glassfish is ready or not to accept JMS connections?

Working from a sample producer, which uses gtools, and by changing the connection parameters from localhost to the ip address for doge: def jms = new ...
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2answers
406 views

Testing a Firewall against outgoing UDP ports

I'm trying to test which outgoing ports are allowed through a firewall. At the moment I can do this for TCP by port scanning portquiz.net (which is a server with all TCP ports open) from inside ...
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34 views

rsyslog loses messages from firewall

I am trying to make rsyslog to log messages from iptables MASQUERADE. I have iptables LOG rule in nat table and PREROUTING chain before the MASQUERADE rules. The actual iptables rules: iptables -t ...
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1answer
37 views

Configure printer on WAN port

I have a network where router 1 is connected to Internet and has a network printer. Router 1 is a home router with default settings. A second router (router 2) is connected to router 1 on it's wan ...
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1answer
118 views

Using Windows FTP client behind strict firewall

There is a software that depends on Windows ftp.exe to transfer files. Problem is, the computer that runs it is behind a very strict firewall, it does not work with Active FTP. Windows FTP only works ...
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82 views

Is there any way to setup port forwarding with a 3G network on a Huawei E303 modem?

I have a problem with my connection. I am using 3G Etisalat SIM in dongle to access the Internet. I can not play games online. Whenever I enter into a server of multiplayer games I gets an error your ...
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2answers
72 views

Is my router secure from remote hackers if it uses NAT and has its built-in firewall enabled? [closed]

My router uses NAT, so it blocks unsolicited packets if I did not send a packet to the source of unsolicited packet first or my port is not forwarded. I understand that this is not meant to be a ...
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1answer
58 views

How to make Windows 7 ask for admin permission for all actions?

For example, Linux will ask permission for each and every action; e.g., for installing software and uninstalling software. Is it possible to configure Windows like that?
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25 views

Why can't my virtual machine reach the host?

After creating the appropriate rule in Windows firewall, I can ping my host machine from the VM: demo@ubuntu:~/aenea/server/linux_x11$ ping 192.168.85.1 PING 192.168.85.1 (192.168.85.1) 56(84) bytes ...
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81 views

In which order firewalld rules are executed in RHEL-7?

Every time rich rule gets different order of display but execution is same. How can i set my own execution order for it? So that particular rule will be executed after the desired one? ...
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131 views

Connect to SQL Server. Error 26 : the type initializer threw an exception: error locating server instance specified

I have a SQL Server 2014 Express installation. It is configured for Remote connections TCP is activated mixed mode Authentications are allowed and the server firewall is deactivated My program ...
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1answer
175 views

iptables failed with “ iptables v1.4.21: Couldn't load match `-d':No such file or directory” message

I am running kernel 3.14.18 and using iptables 1.4.21, built with these options --static-enable --disable-shared. When I run this command: /sbin/iptables -A PREROUTING -m -d 127.3.0.2/24 -j DNAT ...
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1answer
89 views

Need clarification for Sonicwall “Public Server” wizard NAS policies

I used the SonicWall TZ105 "Public Server" wizard to add NAT policies for an internal (non-DMZ) server, but I do not understand the need for all the Custom policies that resulted: # Source ...
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1answer
50 views

Why does a NMAP scan give different results depending on whether it's run from inside or outside a LAN?

I am testing/setting up a Thomson TG585v7 Router/Firewall. Results when running nmap from a computer inside the LAN: $ sudo nmap -O 210.86.xxx.xxx Starting Nmap 6.40 ( http://nmap.org ) at ...
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110 views

How to make netstat on Linux only show OUTBOUND tcp connetions?

My Ubuntu server is infected and there is a process making a bunch of HTTP requests to a bunch of websites. I have added the following to my firewall (UFW): sudo ufw deny out proto tcp to any port ...
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34 views

If nmap reports a port is open, does that ALSO mean a service is listening on the port?

I have a Thompson TG585v7 router/firewall whose firewall is configured to FORWARD several ports to a computer X54 within the LAN. These ports are in the range 1024 through to 2500 That X54 ...
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1answer
86 views

How to stop a DDoS attack using the CSF firewall?

I have a local CentOS server used for web hosting. There are a lot of attacks that come in from many different IP addresses that try to hack into a Joomla 2.5 based website. This causes my Apache ...
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1answer
80 views

How does a IP packet from a remote server “find” a home computer behind a NAT firewall?

I understand communication between a remote machine, e.g. a webserver and users home computer/device can only occur if the users computer initiates the communication (assuming your firewall/network is ...
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1answer
222 views

How to allow only subnet for port with iptables

What i am trying to do is to DROP any packets to specific UDP port, except those one from my secured subnet 10.8.0.0/24. iptables -t nat -A --src 10.8.0.0/24 -p udp --destination-port 63210 -j ACCEPT ...
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92 views

Eset Smart Security Personal Firewall crashes with a bluescreen

When I plug my internet cable in computer, the computer goes to BSOD and says UNEXPECTED_KERNEL_MODE_TRAP. I am sure it is due to Eset Smart Security 8 Personal Firewall Because of when I ...
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1answer
57 views

topology for an unmanaged switch (firewall)

I'm considering an unmanaged switch. My understanding is that many of these devices explicitly lack a firewall. In that case, what do you use as a firewall? I suppose one option would be to use a ...
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1answer
249 views

Is it OK to have kerberos-sec port open to the Internet in Mac OS X?

I’ve just bought my first Mac I want to connect it directly to the Internet in a colocation facility. Running nmap against it shows: Starting Nmap 6.40 ( http://nmap.org ) at 2015-02-18 21:54 GMT ...
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2answers
38 views

Access FTP from outside the LAN

I've a Centos Server. If login via the private IP while in the LAN, I can connect to FTP. If I try to login when outside the LAN, I receive a timeout error. iptables is not configured, so it ...
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22 views

How to diagnose unconnectable port from client side?

I have a machine that can't connect to a certain port number on a server. I've disabled all firewalls and security software. It can connect just fine to 80 and 443, but not 7777. Is there a tool or ...
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115 views

Open ports with iptables — still closed

I'm trying to open some ports for a gameserver, which is running on my Linux vServer (Ubuntu 14.04 LTS 64bit). The game needs the following ports: 16261 (UDP) 16262 (TCP) // Player 1 16263 (TCP) // ...
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73 views

Why is the Windows firewall not blocking outbound ports?

I use the following rule to block all outbound communications to remote 80 ports. I want to use this approach to prevent web requests initiated from this computer. But it seems I still can access web ...
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2answers
82 views

pfsense for its firewall capabilities on small network

I have a small home network of approximately 3 windows machines and 1 pfsense freeBSD (dell laptop): q1. The cable modem is connected to the NON-internet port of the wireless router. Is this the ...
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2answers
257 views

How to use iptables to allow traffic only throug ONE SPECIFIC VPN

I'm trying to allow all traffic from my Banana PI running Lubuntu to only go to my LAN or otherwise through an VPN Server. I'm following this guide: ...
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24 views

Windows Firewall Troubleshooting

I can't seem to successfully allow traffic on specific ports. I've setup an FTP server (IIS). Windows 8.1 x64. I've tested it, and it works fine when I disable Windows Firewall. But when I enable ...
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3answers
102 views

Trying to set up a home webserver using Ubuntu and Apache2

The steps I’ve taken: Installed Ubuntu on old laptop. Given the laptop a static IP address in local network of 10.1.1.12. Add a service to Netgear DG834GU router for port 80 TCP/UDP Set up a ...
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1answer
19 views

FTP and WWW services don't acknowledge connections

I have Lubuntu 14.04 LTS with vsftpd and the lamp stack (apache2, etc.) installed. Everything works fine on the LAN. Externally, the services don't acknowledge connection attempts. I can see packets ...
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54 views

How to make my local tomcat server accessible to www?

So I have my "Hello World" Java project, using Intellij Idea, tomcat 7 is running. OS Windows 7. When I go to http://localhost:8080/ from my PC, it works fine. Now, I want the world to see my ...
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1answer
53 views

How to stop mac from auto port forwarding requests from localhost?

I have an application that is running and listening for local requests on port 4001. Whenever I start a second application to place requests through port 4001 my mac appears to be automatically ...