Software that controls what connections can be made to and from a network.

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iptables should block ssh, but port is still open

I am trying to get the port knocking service working on my raspberry pi. I have edited my iptables rules to block incoming traffic, but I can still ssh into the pi from my macbook. I should NOT be ...
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9 views

Mac OS X firewall settings

Hello everyone and thanks in advance. I'm having some issues with setting up firewall on Mac OS X El Capitan version 10.11.4. I have number of network interfaces including en3, which is my main ...
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SSH remote problems - ongoing issue: Besides ssh not running on the Linux host or firewall running on that host, what other issues could it be?

Regarding the firewall: Linux Mint uses UFW by default. I disabled it with sudo ufw disable. Regarding the SSH Server service not running: I started it after I got a "Connection refused", leading ...
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27 views

Where is my firewall?

Using Linux Mint 17 and logged in as root... When I enter the command more /etc/sysconfig/iptables I get the error /etc/sysconfig/iptables: no such file or directory When I enter the command ...
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10 views

Server 2012 r2 — Opening firewall on remote Server Core machine for MMC (Comp. management) access

MCSA student here. I'm having some difficulty with this one. Same subnet and workgroup. Server 1 is a physical 2012 R2 server. Server 2 is a Server Core running as a VM on a workstation. As part of ...
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20 views

Two Sites, One Firewall, Two wireless bridge, One ADSL modem,Internet Sharing

I have two physically separate sites, Site A and Site B. Site A - connected two Side B via a Wireless Bridge Site A - Transparent Wireless bridge terminates into the switch of Site A Site A - Has a ...
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1answer
11 views

How might one version control Linux kernel firewall rules?

Our router is CentOS but we just use iptables to modify Linux kernel firewall rules. There is a script that's under version control which resets all the chains/rules, but in doing so drops all ...
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23 views

Has Kubuntu 15.10 been hacked?

Can someone tell me what this message means please? [system] Rejected send message, 10 matched rules; type="method_return", sender=":1.19" (uid=0 pid=1183 comm="/usr/sbin/dnsmasq --no-resolv ...
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19 views

Windows firewall slows down Virtual Box Host Only Network with named virtual hosts

I'm trying to port my development environment from linux to windows and experiencing problems with the windows firewall. I set up a VirtualBox machine with a host only network adapter and a static IP ...
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1answer
27 views

Windows 10 net usage

How to stop Windows 10 apps like money, news from accessing internet? I have Norton Security, so I blocked internet to these apps through Norton Firewall page. Then if I open these apps, itsays "no ...
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2answers
20 views

NetBIOS packet probing (port 137). Does it come from the router?

For quite a while my machine's firewall has been detecting strange packets, seemingly coming from my router. I cannot explain this behavior. I suspect that somehow an attacker from the outside is ...
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26 views

OpenVPN fails on different port

I have an OpenVPN setup with a linux server and windows client in mode-server with tap and over UDP. Everything works with port 1194. But I want to change to port 500. On my firewall I forward port ...
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FTP protocol Extremely slow on Windows 10. What could be causing this?

I am running 2 different devices (A pc and a laptop) both on the same network, both Windows 10. The laptop has standard transfering speeds on the FTP protocol. The PC has extremely slow transfer speed ...
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4 views

iptables forward combined with bfifo doesnt work

I have 3 interfaces, 2 internal(wlan0,wlan01 )and 1 external (eth1) and i want to configure traffic from eth1 ,so i use iptables to send all outgoing traffic from the internal interfaces to eth1: So I ...
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1answer
22 views

Cannot set ports to listening even though they have been opened Windows/Ubuntu

Currently trying to set up a connection (using sockets) between my localPC (windows) and my VM (Ubuntu). They are both on the same subnet and can be pinged. Went into Windows features, advanced ...
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17 views

Port forwarding in windows to device

Hi I'm trying to access remotely to the server of a device connected to Windows by Ethernet by port:80. I have already port forwarded that port to the PC and set the Firewall to allow access thru that ...
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8 views

set tun interface to visit the internet

I have a tun interface named tun0(10.0.1.1),and a physical interface named eth1(10.110.136.76) on my computer. I want to use the tun0 to visit the internet. Firstly, I create and set the tun like ...
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5 views

CSF - making outgoing 443 connections

I've installed CSF firewall on my linux, and I have set in my csf.conf: # Allow incoming TCP ports TCP_IN = "22,25,53,80,110,143,443,465,587,993,995" # Allow outgoing TCP ports TCP_OUT = ...
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1answer
10 views

Allow http request over specific port in iptables

I'm running Kodi with a web service for the remote control. The web server is listening to port 11734, however opening that port (UDP and TCP) doesn't seem to work. Once I accept all incoming traffic ...
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20 views

OpenVPN bad source address from client

My problem is that I want to connect to a OpenVPN server on a Archlinux operating system behind a router with nat. The client is behind a firewall/nat too and has 192.168.178.100. The error i get is ...
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11 views

how to block subdomain from any domain with windows7?

There are a lot of crappy websites which install spyware or badware software with a common subdomain name. For example (don't try these URLs, they are dangerous): ...
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1answer
39 views

I can ssh into server A from server B. But I cannot ssh into server B from server A

I have 2 servers in a data center. Server B is publicly accessible, as in, I can ssh into it. Server A is not. So to access Server A, I ssh into Server B. And then from there, I ssh into Server A. ...
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17 views

Add link to Kaspersky whitelist in order to unblock it?

This window appears every 10 seconds saying "Malicious link blocked". I believe that the link is secure. How could I add this link to Kaspersky whitelist in order to unblock it? Note: I'm using ...
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13 views

How to install Sophos on a Netgear ProSECURE UTM50? [closed]

In reference to this post: I'm trying to figure out how one goes about 'jailbreaking' a Netgear ProSECURE UTM50 (now end of life.) I would like to install Sophos UTM Free on this device.
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26 views

Windows Server 2012 Updates

I understand I'm supposed to allow http://.update.microsoft.com, https://.update.microsoft.com, http://download.windowsupdate.com on my windows firewall in order to get downloads to work, but my ...
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how many rules iptables or single chain support

I have multiple user (approx 800 users), I am developing IPTABLES firewall for MAC address based filtering. My Question is HOW MANY RULES CAN I ADD IN A SINGLE CHAIN AND HOW MANY RULES CAN HANDLE ...
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1answer
24 views

Can you install custom UTM software on pre-existing firewalls/UTMs?

I have a Netgear ProSecure UTM50 (the Netgear ProSecure line is end of life.) Is it possible to install something such as Sophos UTM/Untangle/etc. on it?
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1answer
37 views

How to prevent incoming internet traffic without using a firewall?

I'm trying to set up a server listening on the intranet on 80 that can't connect to the internet (inbound or outbound). I've got the outbound part covered using editing of the routing table but I'm ...
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1answer
42 views

Cannot restart apache on Centos 7

I cannot restart HTTPD on Centos 7. When I try to run the command it shows this error below. How can I overcome this? -- -- Unit session-735.scope has begun starting up. Apr 12 15:33:01 ...
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1answer
34 views

iptables rule doesn't work for port 80

My VM has set some rules for access to a web server and a SSH. The server is running in the internal port 8080 en redirected using iptables to the port 80 with the command: iptables -t nat -A ...
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1answer
31 views

tcpdump: Does DNS traffic on eth0 indicate that VPN is improperly configured?

I ran tcpdump -ni eth0 port 53 and tcpdump -ni openvpn port 53, to see if DNS information was being routed through my normal internet connection or my OpenVPN service. I am running ...
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1answer
48 views

What are these IANA IP addresses doing in my firewall settings?

I'm running a Raspberry Pi with Raspbian, which is connected to the WAN via a VPN service. I was monitoring my Ethernet network traffic eth0 using iftop to make sure the traffic goes through vpn ...
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35 views

AVG firewall is blocking VirtualBox machine instance from accessing host's internet connection

I have VirtualBox machine instance which have bridged connection from the host, however my AVG's Firewall is keep blocking its connection, when i turn it off, VirtualBox machine instance can access to ...
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61 views

Block Windows 10 P2P updates with a corporate firewall

I work for a small IT company that fix mostly Windows computers, and lately we have an huge issue with Windows 10 updates. When a new computer enters our network and starts downloading updates, it ...
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0answers
26 views

Mac Firewall - Block all incoming connections except one app?

Mac OS X 10.11 - Firewall Want to keep my privacy but the app is only working when incoming connections allowed. Is it possible to block all incoming connections except for one app? And without ...
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1answer
18 views

Cannot Ping Server From Specific IP Address

I have two virtual machines (Web Server and DB Server), which are connected to each other using local network. The issue I am having is that I cannot ping DB Server from the Web Server, though I ...
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17 views

Is it possible to make Norton 360 firewall always ask if an application should be allowed to communicate?

I remember back in the days firewalls would always ask the user if an app should be allowed to connect to the internet. Norton 360 firewall essentially "allows" all the traffic and you have to go to ...
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2answers
87 views

Shares not accessible by other computers if Windows 10 firewall is ON

I am trying to share a folder on my Windows 10 machine. The computer is connected to the network via Ethernet. The problem is that when I try to access this shared folder from another Windows ...
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1answer
27 views

How to access an ssh server that can't accept incoming connections

The server is current running bitvise SSH (I can readily switch to another solution), it is behind a firewall that blocks incoming connections (I can't open it because of reasons). I have a computer ...
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1answer
17 views

Should Java SE Binary be allowed to communicate with my private/public networks?

I downloaded the Elder Scrolls Online Tamriel Unlimited game on my pc and got a popup explaining that Java SE Binary wants to communicate with public and private networks. I am a noob. I don't know ...
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21 views

Cannot ssh from host to guest os in Virtual Box

I have a windows machine with virtual box installed. I have ubuntu VM within the virtual box. If I setup my vm's network to use NAT, and setup port forwarding to forward from my localhost to the ...
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19 views

Block all inbound traffic except one IP using windows firewall rules

I have no problem doing this in linux. I just write an iptable to block all traffic and another one after to allow a specific IP. However it doesn't look to be that easy on Windows. I did the exact ...
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1answer
9 views

Is there a way to disable OS X's firewall for a specific executable?

I'm a developer and I'm coding a C++ web server, and as part of the development iteration process I have to compile a new executable which opens listening sockets. This triggers the GUI prompt to ...
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2answers
34 views

URL with http not working

I have problem with my mac. no url is working with http url and if I use https then it's working fine. I saw this error in each browser ERR_CONNECTION_REFUSED I think this might be a virus because ...
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23 views

How do PING responses disabled from different subnets?

I found that: I can ping my Windows box A from another computer B in the same subnet. This implies, that echo server is running. I can open remote desktop on A from another computer C in another ...
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21 views

how to set up a deny rule (e.g. Apache) to block a IP if it connects more than e.g. 5 times per second?

if I want to block any IPs that connects the server more than 5 times per second, how to do that? I am currently using CloudFlare firewall to manually block such IPs but it would be nice to make it ...
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30 views

Does KVM put a firewall on top of guests?

I have been working on a project to build an all inclusive server in my home. This is to augment my networking/vm knowledge, and save my Mother money on our cable bill. It right now consists of: ...
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30 views

Wyse Device Manager Disable Wake On Lan

I want to disable Wake On Lan on all my ThinClients without going to each and every one of them and disable WoL in the bios. Unfortunately I couldn't find any setting in the Wyse Device Manager to ...
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14 views

Layer 3 switch with ACL or firewall

I have a layer 3 switch with VLANs that have ACL, do I need to get firewall hardware or will ACL do? This is for a home network.
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19 views

Windows firewall: Allow application to only connect on public network and one port on private network

I have an application that requires internet access and has a web GUI. The internet access should go through a VPN. The VPN is a public network in Windows. I configured the firewall to only allow ...