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

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Allowing Outbound UDP 123 - Security Implications?

What are the risks of allowing outbound UDP 123 for an internal server (archive server) to synchronize with the external NTP server. Our internal server always displays incorrect time intervals ...
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6 views

Check for blocked outbound ports [duplicate]

I would like to do the exact opposite of a port scan from my server: attempt an outbound connection on several ports to a known open server and then determine if any outbound ports on my server are ...
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339 views

Cannot open pritunl port to outside

I'm trying to install pritunl on my Ubuntu 14.04 VPS, I managed to open port 9700, so I can connect to the web interface, my VPN should be running on port 16118, but for some reason I am unable to ...
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33 views

Windows 10: want to force a specific website to be opened only by one of two active internet connections

I have a PC with Windows 10 with two active wifi internet lines with two network adapters. one is wifi adapter and one is LAN adapter. I want to force all pages and files from a specific website (not ...
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97 views

Router reachability / configuration issue

I'm facing a weird problem at home and have been trying to find the root cause of the following problem, and solve it. I have a Motorola router at home and its public IP is 104.32.170.156 (taken from ...
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1answer
104 views

Is there a way to run VPN behind a heavy handed uni firewall?

I would like to run a VPN or similar solutions to change my IP while surfing the web from my work PC. I am connected to internet via Ethernet, and through my university network, which is heavily ...
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1answer
136 views

How to set up a Linux box as a stand-alone firewall/gateway? [closed]

How do I separate Linux firewall/gateway box, to isolate now-chatty-with-Microsoft Windows machines from the internet? Permitting only approved user-initiated connections from Windows boxes. This ...
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1answer
39 views

Limit Windows fiewall inbound rule to IIS only

I have created a new website on IIS which I want to access via my public IP. However to do this I needed to update Windows firewall by adding a new inbound rule. I've set up the ports (80),and ...
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224 views

OS X DNS queries failing with a custom tun interface

I have a slightly modified version of tun/tap for OS X 10.10.5 running. The interface is brought up by a small python script which reads from /dev/tun and then forwards all requests over an adhoc ...
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26 views

Problems accessing Rshiny inside a firewall

Here is the setup I am working with. Office:personal server (win2k8 running shiny + website with iis)+ laptop. Lab: I have tools with data but are behind a firewall, I do however have access to a ...
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145 views

Cannot add/remove “allow incoming connections” permission in OSX firewall from CLI

I am trying to remove an "Allow incoming connections" permission from the firewall in OSX 10.10.5 using the command-line. On one machine I get the following error when trying to remove the app from ...
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116 views

How to block HTTP 302 redirection package by matching a specific string on Location?

The HTTP response I want to block has: Header HTTP/1.1 302 Found Location: ...
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1answer
487 views

Windows 10 can't connect to Ubuntu on Virtualbox

I installed VirtualBox 5.0.4 on Windows 10 Home. And I install Ubuntu 15.04 on the Virtualbox with the virtualbox network set to Bridge mode. The host(Windows) can't ping to the guest (Ubuntu) and ...
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47 views

Is DNScrypt working properly? ESET blocking

I installed DNScrypt on Windows 7 and from a test from dnsleak.com it reroutes the DNS requests. But: I have ESET AntiVirus installed. It has some website blocking included. When I go to a website ...
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44 views

Can I use win7-virtualbox as a router to VPN?

I have a linux mint machine. Inside the linux mint I've installed a win7 that is connected to my workplace vpn. The goal is to route VPN traffic from the host (linux) via the win7-VM. To the ...
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2answers
60 views

how to verify firewall rule for a particular service?

How could i check which firewall rules are used by a particular service and whether port is blocked to restrict access by external users? i.e netstat -tulnp | grep 123 udp 0 0 ...
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1answer
350 views

Cisco ASA 5505 not allowing OPC Traffic

I am integrating a Cisco ASA 5505 firewall in the following manner: Inside IP range (VLAN-AWTP): 192.168.127.xxx (industrial devices) DMZ IP range (VLAN-OPC): 192.168.77.xxx (only has OPC Server PC ...
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55 views

Blocking connection to internet only when certain program is run

I wonder if that is possible. For example: I want to block "Steam"s connection to the internet when I run a certain game. Is that possible or do I have to keep disabling and enabling the rule?
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2k views

Almost all sites won't load in Windows 10

Recently my Internet has been acting badly. Basically, I can only load certain sites. Some sites work great, and others don’t load at all. I think this is because some firewall or antivirus thing. ...
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38 views

transfer ARP on linux iptables with diffrent subnet

Firewall(linux) - with 2 interfaces: internal, external ; also used as GW Internal: 192.168.254.1/16 External: 10.0.254.1/16 external_client(linux) IP: 10.0.1.1/16 internal_client(linux) IP: ...
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33 views

How is Windows ICS service different from Linux-based NAT & routing when I want to hide my LAN structure from ISP?

Background I've been using a WIFI-router as my home gateway perfectly until my ISP appears to restrain the number of connected devices. And currently there is not any realistic upgrade plan from the ...
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43 views

How to forward port-specific IPv6 traffic to the internal network?

I have IPV6 connectivity provided by Hurricane Electric on my home network. Now I want to make my internal IPv6 hosts available to the outside world, but only specific ports. I have created the ...
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1answer
72 views

iptables is treating traffic from different hosts differently in spite of rules

Something spooky is happening here and I don't know how to fix it. Summary: traffic that appears identical to tcpdump is being treated by iptables differently. Details below. Test setup: device ...
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1answer
57 views

Is my wireless router throttling?

I've got a cable modem (wan) --> dell laptop (lan with pfsense installed) --> wireless router (opt1, bridged). When pinging from the laptop I am getting: PING 8.8.8.8 (8.8.8.8): 56 data bytes 64 ...
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176 views

Windows 10 / Mobile Hotspot / Firewall

I'd like to share my cellular connection from my windows 10 notebook via mobile hotspot, but my firewall (AVG) blocks all connections. When I deactivate AVG everything works fine. Is there a rule I ...
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305 views

Is it possible to apply parts of AdBlock+'s EasyList Adblocking list to the hosts file in any way?

I use AdBlock+ for Firefox, but I was wondering if it would be possible to apply AdBlock+'s EasyList filter to the Windows Host file. I doubt that that is possible because of the rules in the EasyList ...
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418 views

Syslog Configuration on logstash (ELK) pfSense 2.2.2

I was wondering if someone could help me out or guide me. So I got everything up and running my only issue that when im trying to filter my syslog dashboard (the system logs of pfSense) it shows ...
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0answers
264 views

How to block a port from all traffic on all interfaces in Mac OS X 10.10.5 (Yosemite)

I need to block port 27017 to do some testing but I can’t seem to figure out how to do it in Mac OS X 10.10.5 (Yosemite). I know that sometime ago they moved from iptables to pf tables, but the ...
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1answer
81 views

Establishing an SSH connection between machines behind firewalls

I have two machines, A and C, each of which is behind a firewall so they can’t accept incoming SSH requests on port 22. I have a third machine, B, outside both firewalls and I wanted to SSH from A to ...
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45 views

Unable to control Windows Firewall

I have no other firewall software installed. Had Panda but removed it when I saw this happen. In the Windows Firewall applet, I'm unable to do anything. Unable to turn on/off. The "Use recommended ...
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1answer
54 views

I accidentally opened a localhost port?

I had accidentally opened a port via firewall which had a WEBSITE(IIS EXPRESS) localhost port number. So could my desktop be hacked by opening a port? And also i had deleted it after a few minutes.
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51 views

Active Directory VPS Server (Security)

I have a VPS configured as a domain controller on the internet as part of a project. I am concerned about security as Windows Built-in Firewall and security has a reputation for being about as easy to ...
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130 views

How to install a network hub to monitor Internet usage bandwidth for each device

bought a networking hub 100base tx so i would like to monitor internet bandwidth consumption for each IP,who is eating my bandwidth. scenario is ISP----Router-----switches----- computers. where to ...
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28 views

no internet with some programs, it's not the firewall

the last few days some programs cannot get info from internet, that is:i wrote the programs with livecode and created a simple connectiontest program that post to a php file on a website and tells me ...
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114 views

How to best configure a home network with one dedicated firewall PC, and two routers (one linked to the other to increase range)?

I have a moderately complex home network, but I'm not getting the data I want from my firewall, which sends nightly reports of activity. My entry point to my network is an Untangled server with 2 ...
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64 views

IPSec VPN - can't access / ping remote computers / NAS drive

I'm connected with the VPN set up on a FVS338 firewall. I connect everytime without any problem, but here's the thing. I can't ping any LAN machines beneath the VPN. However, I can access (and ping) ...
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155 views

Can I track the CPU load that IPTABLES firewall is causing?

Since IPTABLES is a software based firewall, I am wondering if it is possible to log the exact load it is causing, cpu cycles, etc. On a small system I am sure it is trivial. But how about with ...
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4answers
1k views

How to whitelist an IPv6 address in VPC security groups on AWS?

I cannot enter an IPv6 address in the inbound rules in AWS VPC security group settings. It says The source must be a valid CIDR (e.g. 0.0.0.0/0) or the ID of another security group and It wont let ...
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1answer
103 views

Is a firewall saying “DNS server settings changed” when connecting to public WiFi cause for concern?

What does it mean when a firewall says that a new WiFI network connection has caused the DNS server settings to change? What should a regular end-user be aware of, and are there circumstances under ...
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1answer
129 views

Can't Access Port number 80 and 443 after adding Iptables rules

In my CentOS 6 i added a IPtables rules like DROP all the policy like iptables -P INPUT DROP Then I allow Port NO 22,80,443 with this command, iptables -A INPUT -i eth0 -p tcp --dport 80 -j ...
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79 views

SSH through firewall

I am trying to connect to a linux server (via PuTTy) through a firewall. I ran netstat on the Win7 client and found a handful of suitable (listening) TCP/UDP ports. I configured the server to use ...
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25 views

Enforce EUI-64 configuration

I'd like to ask if there is any possibility to enforce EUI-64 address in my network. I'm not able to use port ACL and IPv6 Source Guard because of old IOS system on my switches and the upgrade ...
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0answers
142 views

McAfee firewall blocks localhost in subprocess only

This is a programming-related question but seemed more appropriate for SuperUser than StackOverflow. I have installed McAfee (a trial version of LiveSafe -- Internet Security) on my PC. I am running ...
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0answers
79 views

How to block all traffic except one in windows

I am trying to block all outbound traffic except one. I have referred to this post but it does not seem to help much How to block all traffic but one IP in Windows Firewall? What i am trying ...
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2answers
227 views

Why doesn't my ubuntu host doesn't allow RMI calls from JMeter?

i'm running a jmeter client on my ubuntu maschine. I try to start remote tests via RMI. The start works fine, but i don't get the results back. Start JMeter Server (rhel 6.5): ...
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26 views

HPQC 12.20 Community Edition - How to enable Network access on Windows?

How to enable Network access on Windows ? The HPQC server is just accessable on the same computer at http: // localhost : 8080 / qcbin (without spaces) and at http://192.168.178.2:8080/qcbin With ...
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1answer
31 views

How to find out what system processes an executable/app uses OS X?

I'm trying to find a way to find out what other processes an executable uses so i can block/unblock the app and those processes on my firewall. For example, Google Drive app uses Discoveryd to ...
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1answer
148 views

Stopping multiple IPs from getting logged on iptables log

I want to log all dropped packets with my iptables (by default all except ssh), but I want to exclude the local network IPs as well as 0.0.0.0, 255.255.255.255 and 192.168.0.255 from appearing in the ...
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1answer
241 views

PF firewall: How to disable all filtering on loopback interface EXCEPT specific port forwarding rules?

PF question on OS X Yosemite 10.10.4: I know that set skip on lo0 disables all filtering (nat and redirects) on lo0, but what if I need to save the httpd port forwarding rules on this interface while ...
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430 views

Allow trusted IP and Block others in Windows Server 2008 R2

For protection of a Web Server, I need to allow some trusted IP and block others. The solution I have tried: Create 2 inbound rules : Allow some IP and RDP IP Block All this resulted on ...