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

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15 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 ...
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537 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 ...
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1answer
55 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. ...
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1answer
119 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 ...
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0answers
13 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 ...
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46 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 ...
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90 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 ...
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0answers
18 views

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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35 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
45 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
405 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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17 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
95 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
50 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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0answers
49 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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0answers
48 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
71 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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0answers
37 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
169 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
65 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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66 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
76 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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61 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
57 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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79 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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96 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
35 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
426 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
332 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
249 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
137 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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31 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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1answer
1k 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
149 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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72 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
949 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
147 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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39 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
76 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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35 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
406 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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104 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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0answers
45 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
77 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
101 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
37 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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0answers
125 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
20 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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89 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
57 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 ...