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

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iptable definitions for routing and defence

I'm attempting to configure a firewall on my laptop that allows for routing. The main trick is, I don't want to allow for connections to be made that do not fall under the ESTABLISHED,RELATED ...
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21 views

browsing difficulties airline websites blocked

I am having problems connectiong to various airline websites. Problem is only on my desktop and not on a laptop which connects to the same router. Problem is irrespective of browser - ...
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1answer
21 views

Trying to configure iptables on Slackware 10

I am trying to configure iptables on a Slackware 10 machine. This Slackware version is required in my class - so I cannot upgrade it. After compiling it, I want to configure iptables - however, it ...
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2answers
104 views

Windows Firewall blocking broadcast messages, can't get it to allow

I am in the 11th hour and desperately need help figuring out what is going on. We have a game server that is broadcasting updates over 255.255.255.255 to our wireless devices. The messages are ...
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16 views

Re-connect to corporate firewall

When I power on my PC, the default internet browser open the page: http://go.microsoft.com/fwlink/?LinkID=219472&clcid=0x409 then I have to enter my credentials to access internet. Every time, I ...
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1answer
47 views

My Juniper SRX System-Retry-Options not works, Why?

I have a Juniper-SRX and I want to configure its System-Retry-Options in a way that after 5 unsuccessful attempts to logins for a particular username the device gets locked for the user for 4 ...
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1answer
41 views

Would using a public IP address range on a private LAN cause issues?

A client are having problems with their internet connection. Pings 3 or 4 times then times out for a minute or so. The ISP have taken a look at said they can get a connection just fine to the Cisco ...
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22 views

Set a max for number of failed password log in attempts in juniper srx

Normally my Juniper-SRX doesn't delimit number of failed log in attempts. I want to know if is there any way to change settings in a way that after for example 3 failed attempt, that user locked for ...
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31 views

Netsh firewall: allow a port just for a single interface

In Win7 with netsh I would like to allow a listening port only on a single interface and block it on all the other interfaces. With the GUI this is possible using the "Protected Network ...
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2answers
53 views

Firewalling VirtualBox: restrict host inbound connections to guests only

I have Windows7 + Cygwin and VirtualBox. I would open a listening port on the host accepting only inbound connections from the VMs. Note: In many case the server services running on the host can be ...
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26 views

Open ports for Age of empires in ubuntu router using iptables

The purpose of this question is to learn how to correctly use iptables. As I am currently living in the dormitories in the University and I am using a small netbook as a router to provide wifi in my ...
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2answers
57 views

Linux blocks my ports, how to unblock it?

I use Centos 7. I disabled iptables: sudo service iptables stop sudo chkconfig iptables off I also disbaled SeLinux: $sestatus SELinux status: disabled But ports are bolcked. ...
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1answer
27 views

Set block time with iptables

I have the following rules in ufw, for iptables: -A ufw-user-input -p tcp --dport 80 -m state --state NEW -m recent --set -A ufw-user-input -p tcp --dport 80 -m state --state NEW -m recent --update ...
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49 views

How to ban thousands of IP addresses on 2008 Server

I'm trying to block the Tor Project network from my webserver as many spam/malicous scripts are using it to flood my API. I've tried almost every method possible it seems there is NO WAY to append ...
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1answer
59 views

No internet through OpenVPN

I am having trouble with my OpenVPN setup. I have a Linode box with an OpenVPN server installed on it and I managed to get Tunnelblick to establish a vpn connection from my mac. I followed this guide ...
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26 views

OpenShift Origin: isolating application containers from local network

My network with OpenShift Origin is setup like this: A firewall running pfSense (172.16.0.1 + external IP) A ProCurve J9029A switch (if that helps...) An Ubuntu-based Virtualbox hypervisor ...
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1answer
41 views

How to catch a tcp packet in windows?

I've got Windows 2003 server and i see in my firewall logs some denied tcp packets: about 1-5 per hour. It looks like that: 18:20:37 tcp 192.168.xx.y(4994) -> 104.28.25.67(80), 1 packet 18:39:15 ...
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46 views

If my firewall is switched off,what else could be blocking access to mysql?

I want to have remote access to my mysql server but when i telnet my server from my computer i get this C:\Users\USER>telnet 197.000.0.00 3306 Connecting To 197.000.0.00...Could not open ...
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46 views

M0n0wall Firewall Not Allow Traffic from Different Networks

I have a fairly simple home network set up. First off I have a VMware ESXi server running some VMs. I have an Extreme Networks x250e-48t switch doing all of my routing between the several VLANs I ...
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1answer
24 views

How to whitelist which programs can access the internet

I'm sure its been posted somewhere, but I cant find it anywhere. I am running a Windows 7, and preferably would like to use Windows Firewall, but any other firewalls that will do the job will be ...
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1answer
70 views

Block all IP except few in Windows Firewall [closed]

Multiple windows firewall rules are ANDed together or ORed? Background: I have a SQL database server running on a public cloud virtual machine. I have configured allow connection inbound rule in ...
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3answers
92 views

How Do I Block a Host by ASN? Example - AS16276

There are a handful of especially toxic hosts out there. There is no reason we need to allow any of their IP's access to our servers. Is there a way we can block them using their ASN or other global ...
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2answers
94 views

How to access the setup wizard on Sonicwall TZ 100 firewall

I am trying to setup a TZ 100 firewall. I am following these instructions and I have attempted to follow these instructions: "Connect your computer to the LAN (X0) port on the SonicWALL. Connect an ...
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1answer
94 views

Configure iptables firewall to allow DHCP, DNS, HTTP, SMTP, FTP, IMAP, POP, and Squid ports – deny all other services.

Configure iptables firewall to allow DHCP, DNS, HTTP, SMTP, FTP, IMAP, POP, and Squid ports – deny all other services. 1 pc for router ( place firewall) 1 pc for server ( place web,dhcp,ftp,etc)
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25 views

Firewall Ubuntu UFW port 22

I use ufw firewall, on port 22. I have given the command: sudo ufw allow from a.b.c.d to any port 22. sudo ufw status output looks like: To Action From 22 allow a.b.c.d The OS is ...
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205 views

Difference between iptables default policy to `DROP` and inserting a seperate policy in input chain to DROP all connections

I'm trying to DROP all incoming connections to my server, except from particular networks. At the same time I want to keep all outgoing connections from my server to external network (any network over ...
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4answers
70 views

IPtables keeps resetting rules and blocking almost everything

Every time I reset IPtables, the rules keep coming back in about 10 minutes, blocking everything besides port 22 and 80. When I do a "iptables-save", I see this I can't find out where it's coming ...
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38 views

Mac port issue with Nginx and Tomcat

Configured Nginx to interact with Tomcat on port 9090 on mac. This configuration works when querying on localhost. Fails to work when connecting from outside, until firewall is disabled. I have ...
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1answer
226 views

Windows 7 Firewall blocks incoming connection even though there is an “allow” rule

I'm running a (.net WCF) HTTP Service on 0.0.0.0:60001 and a remote client - on the same network - can't connect. Looking at the windows event log, i can see two related events: Event ID 5152, The ...
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1answer
89 views

Most secure way to have IPtables auto-loaded using Debian / Linux

I'd like to know the safest way to load iptables using Debian. Of course, I can use a script that uses iptables-restore : #!/bin/sh iptables-restore < /etc/firewall.conf but : 1) where is the ...
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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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1answer
35 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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22 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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1answer
104 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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61 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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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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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
32 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
25 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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49 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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0answers
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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33 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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3answers
41 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 ...
6
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3answers
331 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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1answer
125 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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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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31 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
49 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
52 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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46 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 ...