A Firewall is an application or hardware device used to inspect and filter network traffic.

learn more… | top users | synonyms

0
votes
2answers
13k views

Fortigate 200A firewall CPU high resource usage

This morning I'm receiving complaints from several end users that saying their whole department network are slow and have intermittent. Therefore I've checked our firewall to see whether if something ...
0
votes
1answer
14 views

No Internet on Router with pfSense

Sorry in advance if a similar question has already been posted I am with Sky for broadband and have a router providing DSL connectivity. I have a cheap 64 bit desktop PC running pFsense as a ...
0
votes
2answers
42 views

Windows Server 2012 unable to access specific SSL page

This problem really boggles the mind. I have a standard Windows 2012 server with windows firewall enabled. Using Chrome, I am unable to access a certain HTTPS website while other HTTPS websites can ...
1
vote
1answer
15 views

Connect from one LAN to another LAN through SonicWALL

I have a LAN (LAN 1) on the 192.168.1.1 subnet, and another LAN (LAN 2) on the 192.168.2.1 subnet. LAN 1 is on the X0 interface, LAN 2 is on the X4 interface. I want to be able to access a device ...
-1
votes
1answer
25 views

Iptables DNAT working in my own network, but not through VPN

For some reasons I need to switch a server ip to another ip, in order to be seen by another computer elsewhere through vpn. So I'm using iptables (didn't know any of that until yesterday) and testing ...
1
vote
1answer
429 views

Iptables: how to easily group rules in chain?

I have some netfilter rules like this: iptables -I INPUT -j NFQUEUE -p udp --dport 4444 iptables -t mangle -I INPUT -j MARK --set-mark 100 -p udp --dport 4444 iptables -I OUTPUT -j NFQUEUE -p udp ...
-2
votes
0answers
18 views

OpenSuse: How to allow an outside network to access the local network?

I want to connect vlans of two separated networks I administer and it's almost complete, Allow me to describe the situation: Network A's firewall is a FortiGate 1000C and the vlan is 192.168.2.0/24 ...
3
votes
6answers
7k views

How can I figure out if port 25 is blocked on my network?

telnet mydomain.tld 25 tells me "connection refused" that's the extent of my network hax0r skillz. how can i tell if it's my network i'm on or the server itself?
1
vote
1answer
57 views

Hadoop namenode port getting blocked

I have installed 7 VM instances of Ubuntu 14.04 LTS servers. First instance runs the namenode service and all other 6 nodes run datanode service.I think my NameNode is getting crashed or blocked due ...
-2
votes
1answer
23 views

Creating a Firewall / Gateway Server [on hold]

I'm looking to increase my server network security by creating a Firewall + Gateway server for a web server. The servers are all part of digital ocean. The webserver is a LAMP stack with multiple ...
0
votes
1answer
27 views

Cannot open port 1337

I am struggling with iptables firewall to open port 1337 externally. My iptables file looks like this: *nat :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] ...
0
votes
0answers
13 views

PHP FTP Pasv mode on CentOS 7

I need help with connecting to a FTP server and using the passive mode. They told me I need to open ports 20, 21 and 5000-5100 range. I've got a virtual machine running CentOS 7 on a dedicated server ...
0
votes
1answer
1k views

server at port 80 seems up, but I can't access it.

I can't access my server remotely at port 80. First of all, I did not set it up. Someone else did. I am not a sysadmin. But communication between both parts (me and sysadmin) takes time and deadlines ...
-1
votes
1answer
19 views

Block Dynamic DNS update requests

I need to block all dynamic dns services update requests from my network so that no dyndns client be able to update its IP. Do the major dyndns providers use a standard protocol or each one uses its ...
1
vote
0answers
12 views

External Access to Internal Network and Websites — Microsoft Networks

I need to be able to expose a set of "internal" web sites to Internet users somehow. Please bear with me as network engineering isn't my forte. I'd appreciate any insight or suggestions to this task. ...
1
vote
1answer
6k views

Handshake violation when trying to access one website

I have a TZ 190 Wireless Enhanced with SonicOS Enhanced 4.2.1.0-20e. Yesterday, people could access without any problems a bank website wich uses HTTPS. Today, it is imposible to access only that ...
1
vote
1answer
1k views

Should I create a second WAN Interface for a new SSLVPN setup on my Sonicwall 2400?

Sonic Wall 2400 I'm setting up a new SSLVPN on our Sonicwall, very new to this. I currently have an exchange server as well, so mail.company.com is directed to our mail server. I'd like to setup a ...
2
votes
1answer
2k views

QoS settings for Wi-Fi calling on pfSense firewall/gateway?

The new version of iOS 8 as well as Android supports Wi-Fi Calling with multiple cellular providers including T-Mobile in the US. I am currently running pfSense as the primary Internet gateway for ...
-1
votes
0answers
13 views

Which Firewall Should I Buy [on hold]

I'm considering buying a firewall i don't want anything to expensive but i'm looking for something with nice features like lcd screen showing speeds etc, if you could take time to comment if you have ...
0
votes
2answers
1k views

Access print server through firewall?

At my workplace, we have two fiber networks setup, one for the business network and the other for process control (industrial manufacturing). On the business network, there is a standard print server ...
1
vote
2answers
2k views

Iptables - Allowing only a single dhcp (relay) client

I am trying to create a firewall rule on an Ubuntu 10.04 server running isc-dhcpd. I only want dhcp to be accessible by a single relay host (172.1.1.1). I have iptables set up like so: # iptables ...
0
votes
0answers
8 views

Pfsense firewall log format and packets data length

In pfsense firewall logs there are many fields described here: https://doc.pfsense.org/index.php/Filter_Log_Format_for_pfSense_2.2 I would like to get some statistics from these logs about traffic, ...
0
votes
1answer
34 views

Hyper-V disable internal firewall

How can I disable a firewall on my internal network? Problem I have a Hyper-V on a Windows Server 2012 R2 with one VM, when I disable the firewall I can get internet on my VM, but when I turn on ...
0
votes
4answers
104 views

How can I limit SSH access to my own 2 IP addresses? [on hold]

I am getting > 100 attempted logins per minute in my /var/log/auth.log so a quick search online on how to limit SSH access to a particular IP address lead me to a question and answer on here. However ...
0
votes
0answers
10 views

DSL modem in bridge mode but router not accessible from the internet

I have a DLink ADSL modem which I have put into bridge mode and connected to a Fortigate 200A firewall. The Fortigate is able to connect through PPPoE and receives the static public IP. I can browse ...
1
vote
2answers
1k views

Smoothwall Express interface issues

I have a SmoothWall Express box that is currently configured with a Green and Purple interface. Both interfaces are in the same /24 subnet (which seems odd to me). The green interface (address of ...
-3
votes
0answers
25 views

eth0 as a management interface for port 22 and 3389 and everything else through wlan0 (iptables) [on hold]

I would like to use iptables to: Allow port 22 on eth0 Allow port 3389 on eth0 Disallow everything else on eth0 Allow all traffic on wlan0 (web browsing, etc.) Essentially I want to make eth0 the ...
1
vote
0answers
70 views

How to simulate network partitions on windows? [closed]

Working on a project which implements a clustering algorithm. One important property of the clustering is to respect guarantees when face a network partition. To prove that clustering works I need a ...
-1
votes
0answers
22 views

Windows server 2008 - Can't access a specific IP [on hold]

I have a fresh install of windows server 2008 on a dedicated server. I would like to remote connect to one of my server tough mysql. I get this error: Warning: mysqli::mysqli(): (HY000/2002): A ...
6
votes
4answers
3k views

SSH from A through B to C, using private key on B

I'm looking for a simple way to SSH from my local machine, A, through a proxy, B, to a destination host, C. The private key that goes with the public key on C is on B, and I can't put that key on my ...
-4
votes
1answer
24 views

ip6tables -L explanation [closed]

Can someone explain me the following rules in the INPUT chain of the firewall. Chain INPUT (policy DROP) target prot opt source destination ACCEPT all ...
-1
votes
1answer
20 views

ruleset iptables- user defined chains [closed]

I am very new in iptables. Learning to use them. I got a hang of some basic commands from https://help.ubuntu.com/community/IptablesHowTo. However, I didnt find good explanations of examples of a ...
3
votes
1answer
2k views

Windows Server 2012 Port Forward for Specifc Host

I am trying to have a specific host be redirected to another port when trying to access a service on port 80. So, when the client (192.168.1.22) requests a connection to the server (192.168.1.10) on ...
1
vote
1answer
2k views

with ec2, are all internal instances able to connect to each other, or does the security group apply?

Just a little confused, normally a firewall applies to everything externally, and all internal servers (instances) can connect freely with each other. With AWS, it comes with a firewall/security ...
0
votes
2answers
37 views

Is there any disadvantage to putting a modem in bridge mode

In order to prevent the need of port forwarding and double natting I plan to put a modem into bridge mode. Are there any side effects or problems that could come of placing a modem into bridge mode in ...
2
votes
3answers
4k views

WMI: How can I fix the port?

I need to use WMI for getting some information from my servers. But I have a server in DMZ, so I need to open a port in my firewall. I've searching and I found that WMI uses random port. How can this ...
0
votes
1answer
12 views

Not able to connect to GitHub though the Firewall

We have Fortigate Firewall install on the network, What port I should open to connect to the GitHub repository using the https:// protocol. I found a similar question , And allowed the port suggested ...
0
votes
0answers
20 views

Is it possible to provide Internet access for an access point in a wireless network that using web based authentication for Internet users?

There is a web server that is configured to use an access point to connect to the Internet. The access point only needs the wifi password of any network with Internet access to connect to the ...
0
votes
2answers
2k views

Windows Server 2008 R2 Firewall - Interface specific rules

I'm trying to define per interface rules, much like it was in Server 2003. We will be replacing our old 2003 server with a new 2008 R2 server. The server runs IIS and SQL Server. It's a dedicated ...
2
votes
1answer
3k views

Watchguard config, drop-in or mixed-routing mode?

I have a Watchguard XTM 2 that is currently acting as a firewall and a router for my business network, I currently have the WG setup in mixed-routing mode and am happy with the current configuration. ...
1
vote
3answers
4k views

Configure multiple lan interfaces for same subnet on sonicwall

We have a sonicwall 2400, Is there any way to assign multiple interfaces to the same lan subnet? Basically, we would like to have X1 for the wan and X0, X2, X3 and X4 connected to 4 devices that would ...
4
votes
1answer
8k views

PPTP connection fails with errors 800/806

I've got a client (Server 2008 R2) that won't connect to our production environment PPTP VPN server (Server 2003, running RRAS). The server is behind a firewall that has TCP1723 open as well as GRE. ...
0
votes
0answers
8 views

Turning extra 6 LANS into “router” like links using Sophos UTM 9 [migrated]

Hey all I just finished up setting up the UTM 9 Home edition and I currently have it up and running with eth0 as the WAN and eth1 as the LAN. However, my motherboard has a total of 8 Ethernet ports ...
0
votes
4answers
1k views

Server not reachable on all TCP ports from all locations

I have a very strange situation on a Linux (CentOS) server. Firstly, from my Ubuntu desktop PC, I can successfully connect to all services that are running on it, on ports 22, 80, 8080 and others. ...
0
votes
0answers
9 views

Will enabling Comcast Business Gateway Port triggering lock me out?

Device info: SMC Networks Firmware 3.1.6.56 I am remotely logged into a server and configuring the "Comcast Business Gateway". At the current moment, Within the Firewall >> Port Configuration >> ...
1
vote
1answer
981 views

Ubuntu 12.04 open port 80 inside VLAN

I have an nginx server running on ubuntu 12.04 that serves http through port 80 and https through port 443. Everything works fine if I access it from the same computer via localhost, 127.0.0.1 or the ...
0
votes
1answer
15 views

pfSense: Cannot filter flood of multicast packets being blocked by default

There are multiple devices under a different subnet on our LAN sending a flood of multicast packets. I've tried to allow this type of traffic, but it does not seem to work.
0
votes
5answers
14k views

Unable to connect to MySQL through port 3306

I read the answers about 3306 from a question posted in 2009. I have the same problem, but the answers I read didn't help. Port 3306 is open, even if I stop the windows-firewall, MySQL still can't ...
5
votes
1answer
227 views

IIS FTP Not Working Remotely Windows Server 2012 R2

We are attempting to duplicate our server in the Azure cloud. Both are Windows 2012 R2 servers. FTP works on the original server but not on the duplicate server. Additionally, the duplicate server ...
1
vote
2answers
1k views

KVM: All network traffic to one guest (firewall)

I am currently using a VMWare ESXi 5.5 server for my virtualisation. The network setup is like this: PFSense firewall is the center of it all and connected to: LAN Network (physical NIC 1 assigned by ...