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

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337 views

Lync keeps dropping because of D-Link DIR-601 router. How to configure firewall to fix this?

I saw this article, and it's exactly my problem, but my settings are a bit different and nothing seems to have fixed it so far. Why does my D-Link Router keeps dropping my Outlook and Lync connection?...
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1answer
168 views

Limit Netgear Nighthawk AC1750 to given WAN IPs

I have a Netgear Nighthawk AC1750 router, and have SSH, HTTP, and several other ports forwarded to a server. It is not for public use, and will only be accessed by me. I've recently had 60,000 hits ...
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50 views

Should I allow or deny helpd file to establish connection in my Firewall on Mac OSX 10.8.5?

As in the subject line. Should I allow or deny helpd file to establish connection in my Firewall on Mac OSX 10.8.5? I would appreciate answer to that and more elaborate answer what exactly "helpd" ...
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1answer
104 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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82 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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1answer
233 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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55 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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56 views

CentOS - ipTables

I have some questions about ipTables. Is it possible to open all ports between 2000 and 6000 and then have 2245, 5435,5434 closed? Is it possible to open some ports from a ip address? Eg. The only ...
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41 views

Firewall policies

I have a Juniper 5GT firewall that I use for my home server, On my home server I have an SSH server running, I am trying to access the SSH from the untrust side of the firewall, from what I believe ...
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1answer
17 views

Restricted logins + almost all ports closed : secure?

Context : I plan to travel. I want to make a little cloud with my personal server. I wish I could d/l some of my files and eventually upload some files which will not be executed and the whole is ...
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1answer
288 views

Amazonaws blocked by modem?

since some time i have the following problem: I can't download a .exe file (in my case the "Minecraft.exe" file) from s3.amazonaws. It does not work on 2 laptops, which are connected with a Vodafone ...
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1answer
92 views

Reach ssh server behind a router on embedded system using established socket connection

I have developed an embedded application running linux to do remote I/O control. The application open a socket connection to my server to communicate, periodically, the state of the I/O and getting ...
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1answer
527 views

Block All Traffic and Allow from Defined IP only in IPTABLES

I want to create a gateway firewall for my network . I want to block all the internal traffic on gateway and allow it from two computers only . On gateway --> eth0 is network card in gateway PC ...
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1answer
2k views

Cablemodem (SBG6580) firewall denying some outbound traffic? Why? Not configured

I finally got around to turning the syslog on for my cablemodem (Motorola Surfboard SBG6580) and I'm seeing about the expected amount of inbound attackage being blocked... 2014-05-30 21:59:02 ...
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1answer
262 views

Bypassing proxy for loopback/locahost

I am developing a web application where in I am running a webserver at localhost:3000 and my app is deployed on the same. Access to this URL through a web browser works fine because there is an ...
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1answer
388 views

iptables --append FORWARD required for routing between NIC alias IPs?

I have an ubuntu box with a single NIC. In order to bind a number of services (like apache, dnsmasq, etc), I have bound them to different alias's (e.g. eth0:0, etc), some of which are on completely ...
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438 views

How do I fix these iptables?

I am trying to setup my networks firewall, and am having trouble because i keep getting kicked out of SSH because of mistakes. Here's what I currently have: # Custom Rules iptables -F iptables -X ...
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1answer
456 views

Router Firewall: All ports stealth mode except when I connect using VPN-then port 88 open

I am using a Netgear wireless router, and its internal firewall is good. Testing by using Gibson Research "Shields Up" indicates all ports invisible. However, when I use a VPN service to connect to ...
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208 views

Why isn't my router allowing my PAP2T to connect to my VoIP service?

My tech knowledge is middle-low: as you can see I'm not shy about getting into the interfaces for my router, but have no idea what the more complex settings mean. I got a new wireless router (D-Link ...
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1answer
471 views

SSH into host on the same network behind a firewall that blocks SSH

I'm trying to SSH into my Raspberry Pi, which is on the same wireless network as my SSH client. My firewall blocks SSH connections. I changed the sshd listening port in my Raspberry Pi to 80 like ...
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438 views

Unable to change Windows Firewall settings

I am unable to access the settings for Windows Firewall on my Windows 7 32-bit computer. I go to System and Security (Start > Control Panel > System and Security) and click on Windows Firewall, but ...
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1answer
2k views

Is the Whitelist Network Service Filter Feature on ASUS Routers broken?

I have a ASUS RT-N16 router running firmware version 3.0.0.4.374_4422 I have a voip phone (physical) with it's own private IP address (for the purpose of discussion, let's call it 192.168.0.1) and ...
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1answer
572 views

mac osx littlesnitch blocking outgoing connections from ssh remote login

I have setup remote ssh access on the rush in my development computer (OSX 10.6.8) before leaving my home for holiday yesterday. It is correctly setup, and I can access it via SSH, logging is as root ...
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1answer
337 views

How to block all applications from accessing a connection in Windows 7 firewall?

I consider myself quite tech-savy but this one gives me real pain. I've connected to VPN through PPTP and I'm attempting to set up firewall rules to block any application from using it. Essentially, ...
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1answer
2k views

telnet 500 Syntax error, command unrecognized

I'm trying to send email using telnet in cmd. I have connection with telnet now C:\Users\Student>telnet alt3.gmail-smtp-in.l.google.com 25 then it brought me here: 220 mx.google.com ESMTP ...
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1answer
202 views

configuring juniper ssg 20 VIP

We have juniper ssg 20 and wanto access our camera system from outside network. I have defined a new port(82) on Policy/Services/Custom screen. And unTrust interface I have added new VIP service for ...
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1answer
3k views

Is it safe to turn off Windows Firewall on private network?

In windows firewall there got two options, one if for private network, and the other is for public network. As I am using CCProxy for my local network and it is suggesting to turn off firewall for ...
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1answer
38 views

Is it bad to have a stand alone firewall that disables the native system firewall?

I've heard claims that firewalls such as the one that comes with Avast are better than others that disable the system firewall. Is it correct that it could lead to problems disabling a firewall built ...
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1answer
105 views

VPN error 800, when remote but not locally

I am going to spend a few days in my summerhouse, and i would like to have access to all my media on my server so i am trying to set up a VPN. I have followed a guide, and i am abe to connect to the ...
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1answer
254 views

5 Feb 16:53:26 ntpdate[414]: no server suitable for synchronization found

I want to setup ntp in beaglebone based custom board. /etc/ntp.conf file content is as mentioned below driftfile /var/run/ntp.drift server pool.ntp.org server 1.in.pool.ntp.org server 1.asia.pool....
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853 views

How to Block ALL incoming/outgoing internet traffic EXCEPT streaming to an Xbox?

How can I block all incoming/outgoing internet traffic except streaming to an Xbox 360? For the past few weeks, streaming video files from my PC to my Xbox 360 has started failing, with the videos ...
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1answer
149 views

Setting up port 3360 access on McAfee firewall using windows 7 for network access

I have a windows 7 machine serving me PHP / mySQL etc i have set is all up well and is all working on local machine as well as on local network machines. My issue is that when i try to connect ...
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1answer
682 views

Configure Packet Filter with white-list and black-list

I’m trying to configure Packet Filter on a FreeBSD server with a black-list of addresses/networks to block and a white-list of trusted users which cannot be blocked (black-listed). Here is my first ...
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1answer
254 views

how to restore iptables after iptables -F?

I used iptables -F on my machine, and what can I do to recover the iptables into the default without rebooting my machine? I restarted the iptables service and it failed, and I can't find iptables ...
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1answer
325 views

Remote Desktop IP conflict

We have several outside users who connect to our server using the external IP. Everything has been configured correctly and it has worked for several years. Two days ago we had a test firewall (new ...
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1answer
565 views

Iptables filtering and NAT with secondary IP address

I have two IP addresses on my physical eth interface. Lets say 192.168.10.7 (eth0:0) and 192.168.0.7 (eth0). So it works. But I use application, working on the only one of this addresses on port 12000....
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1answer
4k views

Firewall open ports for vSphere

I need to open ports on a firewall, so that a client could access his VM console through vCenter server's Web Client. I had a look at this page about port description, but I am a little confused. I ...
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1answer
408 views

Group Policy settings for the Windows Firewall are sometimes ignored on startup

We deploy our Windows Firewall settings (among other security settings) as local policies to our machines. They are not part of a domain. There is a weekly restart configured for each machine, ...
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1answer
3k views

Adding many IP addresses to Windows Firewall using CLI fails partially

I have a PowerShell script which adds IP addresses to Windows Firewall using the "netsh advfirewall" command. (As described in this question: How to append netsh firewall rules, not just replace). ...
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1answer
967 views

Firewall and Blocking [More] Traffic

I have a MacBook Pro with the firewall on. I'm trying to run a Wireshark trace and the noise bleeding through Apple's firewall is very distracting. According to the image below, most of this noise is ...
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1answer
69 views

unable to start apache after changes to rc.conf and resov.conf

I had a working configuration this morning with the following simple /etc/rc.conf ifconfig_rl0="DHCP" ifconfig_xl="inet 192.168.1.11 netmask 255.255.255." defaultrouter="192.168.1.1" I added the ...
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1answer
2k views

Fedora's firewalld vs iptables

I am on Fedora 19. Is my understanding correct that as long as firewalld is up and running (and properly configured using firewall-config) the contents of the /etc/sysconfig/iptables has no meaning? ...
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1answer
125 views

Limit download over certain filesize through network

This is more of a network question rather than programming but Is there a way to limit a download over lets say 20MB to throttle at 16KB? I am trying to limit files over 20MB to throtle at lets say ...
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1answer
306 views

How to tunnel a port from a server behind a firewall to a remote server that allows connections via ssh?

I have a scenario where I need to open up a port for a server behind an ISP that appears to be blocking traffic. In this case I have a dedicated server remotely that I can ssh into and use whatever ...
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1answer
148 views

How to replicate couchdb instances behind home router firewalls?

What are the options (if any) to allow replication between couchdb instances without portforwaring the couchdb port on a home router? Assuming both couchdb instances are behind home router firewalls.
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129 views

Proxy for joining two inbound connections from separate locations

Good day, I have two computers behind firewall with no port forwarding set up. These two computers need to communicate with each other by using only outbound connections. I'm looking for a proxy ...
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1answer
2k views

Port forwarding, remote host, no-ip (static IP access) problems

Im trying to run my custom game server on my local machine. I used no-ip.com to create a static internet location for my game to connect to. I downloaded their DUC program that should access my data ...
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1answer
291 views

Disabling Windows 7 Firewall when Behind a Hardware Router

Is it safe to disable Windows firewall when I'm behind a router? I'm having a few Origin connection problems that I'm hoping can be resolved by disabling Windows firewall. I'm assuming that the router'...
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1answer
4k views

tracert command is not working but able to access the same site through browsers

tracert [site name] is not working in cmd prompt. But the same site has been working in all of my browsers . Please find below output of command. I need to use this command in my batch file but there ...
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1answer
134 views

IPTABLES to block sites on browser

I am trying to block a specific IP address from being accessed using the browser on my system. I added a simple rule as below iptables -A OUTPUT -d <IP> -j DROP The site gets blocked in the ...