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

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Why server shows time out for 5 second then connecting in redhat linux

I have a DHCP server configured in Red Hat linux , there are two NIC Cards there , one connected to LAN and other connected to WAN , But i am losing internet for 5 second in one minute and this cycle ...
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1answer
17 views

Scalable remote access gateway for 20K+ servers

Consider a worldwide distribution of thousands of embedded servers, and clusters of servers behind firewalls that sysadmin wants to access remotely. With a focus on a remote access for login and ...
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2answers
3k views

Juniper SSG5 DHCP IP Pool is full. Unable to offer IP address to client

hope we have some Juniper guys around, I have configured a Juniper SSG5 as our main firewall/router the DHCP server set on interface bgroup1 to have a rang from 10.10.10.76 to 10.10.10.210 All ...
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1answer
7k 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 ...
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3answers
5k 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 ...
2
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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
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1answer
26 views

Port forwarding in pfSense not working

I recently set up a pfSense router and can't get any port forwarding to work from outside my own LAN. I have the following forwarding rule to a local server located at 10.0.1.2: Note that if I ...
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2answers
2k 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 ...
4
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1answer
9k 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. ...
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0answers
12 views

linux firewall, log and display traffic [on hold]

my debian/linux gateway serves many private devices. I want to log all trafficvolume per device and per portusage. Is there a OSS solution with a nice webfrontend to display (sortable) this data?
0
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1answer
42 views

Need Required Active Directory Ports for Isolated Environment

We have a 100% isolated environment that needs to communicate with our AD infrastructure outside the isolated environment. I need to know all the ports and whether they're incoming or outgoing. These ...
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0answers
17 views

Cannot Upload Files Over A Specific Size to Wordpress

When uploading larger files to any WordPress site running on a local server it fails. If I try outside of the network it works fine, if I switch to the other LAN network running and connect to the ...
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2answers
1k views

How to establish firewall rules that accepting 11211 port in intranet for memcached ( Fedora)?

I am new for fedora and backend. And i have a job recently, to build a game server via linode. The current setup is 2 linode + 1 nodebalancer, I have a memcached server on each linode and I have setup ...
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0answers
19 views

Issue with Fail2ban and Mikrotik Firewall

OS: CentOS 7.1 At my organization we are currently assessing using Fail2ban with the firewall on our Mikrotik router. I want Fail2ban to communicate any IP flagged as banned to the Mikrotik ...
1
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0answers
25 views

Why does my firewall block outgoing TCP/UDP port 137 ~ 139 + 53 ~ undefined [migrated]

I've got a Draytek Vigor 2930 router which has a default xNetBios -> DNS which blocks "TCP/UDP, Port: from 137~139 to 53~undefined". What is this rule, and what is its purpose?
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2answers
18 views

Accessing an FTP share via UNC path?

I have an FTP share configured on a server that I can access successfully using ftp://xx.xx.xx.xx/. One of my tools (Release Management) requires a UNC path for access: (it won't let me post ...
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0answers
390 views

Client can not access some HTTPS through Squeeze gateway

I have a gateway (+firewall +proxy) set up on a Squeeze box with 2 NICs. The problem is the client cannot see some of the HTTPS (for example they can go https://mail.google.com but not ...
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2answers
26 views

How safe is IPtables whitelisting?

I am deploying some VPS and of course, security is a big concern. I read that IPtables whitelisting is the best way to safeguard your machine. So I set up the follwing : echo "Flushing rules" ...
0
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1answer
1k views

Can't connect VPN tunnel when other on same NAT-router is connected

We have recently changed our FW to a ZyWall 310 with drastically improved throughput over the old one. However there is a new problem that occurred, we have several L2TP/IPSec clients that connect to ...
2
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8answers
36k views

Active FTP client blocked by Windows Firewall on Windows 7

I have an application that runs as a service and contains an FTP client. It needs to connect to an FTP server that only supports Active FTP. When I attempt to get a list of files or download a file, ...
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1answer
1k 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
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0answers
19 views

pfSense Killing Uploads to Any Wordpress Site

I am running a pfSense firewall on version 2.2.6. As far as I remember I have had working rules and have not had any issues uploading to my wordpress sites until this last upgrade. If I try to upload ...
0
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1answer
3k views

iptables forward rule not working in openwrt

I am trying to apply some iptables forwarding rules in openwrt. Here is my scenario - My server has two cards ath0 and br-lan. br-lan is connected to internet and ath0 to private network. The other ...
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2answers
21 views

IPTables: How to log and set a specific log file

Is it possible log all dropped connections by IPTables and set a iptables.log file for logging in /var/log/?
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2answers
25 views

IPTables: apt-get and wget not working

When resetting IPTables, the apt-get and wget command functions correctly and also downloads what I want. But once I activate this firewall, it isn't functional. Pings still work. I want to allow all ...
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0answers
12 views

Can't connect to VNC server via OpenVPN

I've got the problem with connecting via VNC to remote computer. Connection goes through OpenVPN and I'm routing 5900 port to localhost.. ssh -p(port) -L5900:vpn adress of machine:5900 ...
15
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1answer
18k views

Can I use ufw to setup a port forward?

Im currently using ufw to enforce some basic firewall rules. Is it possible to also use ufw to do port forwarding? Specifically im wanting to forward incoming traffic to my server (same machine ...
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1answer
3k views

Open port 8009/tcp on Fortigate necessary?

A nmap scan of a Fortigate Firewall showed that TCP port 8009 open is. According to knowledge base articles this is only to download the client for ssl vpn. Is this port used for anything else, and if ...
0
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1answer
22 views

app runs much slower on VPN [closed]

I have an app that accesses the internal network at work. I can run it from home via VPN but when I do, it runs much slower. I suspect that it is getting timeouts caused by the firewall and somehow ...
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3answers
7k 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 ...
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0answers
16 views

Correct Azure VM firewall settings for Azure SQL Database v12

One of the recommendations when a client runs on an Azure VM and needs to connect with your Azure SQL Database v12 is to: Ensure that the port ranges of 11000-11999 and 14000-14999 on your Azure ...
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0answers
4 views

How can a WiFi router recognize MAC address change of a connected device? [migrated]

My teen son and I are playing a hacking game. I've installed an WiFi router with parental controls, MAC filtering, VPN, etc. I block Internet for him, he tries to break out of the cage (for now I'm ...
0
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1answer
17 views

How to connect to ftp server from within LAN when the router port-forwards external connection away from it

Sorry for the long question. What it means is this: I am managing a small LAN that is protected by a router. router 192.168.1.1 server 192.168.1.9 client 192.168.1.2 client ...
5
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2answers
3k views

Secure NAT setup with iptables

I have a Debian running device that needs to act as an internet-gateway. On top of that I want to provide a firewall that not only blocks inbound traffic, but also outbound traffic. And I figured ...
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2answers
367 views

How can Rackspace cloud servers be set up with an EC2 type approach to firewalls?

I'm looking at using Rackspace cloud servers for some Windows based web hosting, and having used Amazon EC2 for similar projects before, I was disappointed to find Rackspace don't employ the EC2 ...
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2answers
64 views

How can I find out if a port on a remote server is open as well service listening status on it?

I want to check if a set of ports are opened or closed on some remote servers. I went through various discussions on the subject and most of the people suggested to use nmap, nc and telnet ...
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1answer
35 views

IPTables: Does blocking spoofing, affect any services? [closed]

Do these rules affect any services/applications? Will apt-get and others still work? - iptables -A INPUT -s 10.0.0.0/8 -j DROP - iptables -A INPUT -s 169.254.0.0/16 -j DROP - iptables -A INPUT -s ...
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4answers
3k views

Sonicwall NSA2400 - No internet access

We've got a SonicWall NSA2400 configured with a LAN (X0) and a WAN(X1) interface. It was setup and working fine until just recently when a temporary worker changed some settings most likely NAT. We ...
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0answers
21 views

Windows Firewall - Block IP address

The configuration is exactly as following: I am absolutely certain that 192.168.2.6 is the correct IP address, yet the according computer remains able to access shared files. Where could I go ...
0
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1answer
42 views

PsExec Slow to connect when Windows Firewall Enabled

situation: running PsExec takes 20 seconds with windows firewall and 1 second with it disabled. Exceptions added to firewall: opened ports 135 and 445 (both tcp) as per ...
0
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2answers
36 views

Azure VM instance IP firewall

I assigned an instance-level IP address to my Azure VM. I then configured the SSH "endpoint" from the Azure portal and defined a deny-all policy. However, this policy seems to only affect the cloud ...
0
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0answers
9 views

Block certain SOAP requests [closed]

I have a soap service running on my network. The problem is that the soap exposes some management functions that (malicious) clients should not be able to invoke. They should only call some restricted ...
2
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4answers
18k views

VPN is working, except for DNS lookups. Firewall (Cisco ASA 5505) issue?

I've got the following set up: LAN -> DHCP / DNS / VPN server (OSX 10.6) -> Cisco ASA 5505 -> WAN Connecting to the LAN via VPN works fine. I get all the details properly and I can ping ...
0
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1answer
1k views

ZenOSS webinterface connecting

I'm having a problem with ZenOss. I installed the centos stack installer on Centos 5.5 x64. De installation succeeded and no errors where displayed. But when I tried to surft to the ip address it ...
0
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1answer
1k views

How to unblock service discovery for IPv4 via Avahi?

On a Debian 6.0.6 system (squeeze) I am having trouble resolving a host using Avahi and IPv4. Here is a sample output: : nr@homedog 10102 ; avahi-browse -a + eth0 IPv6 yorkie [00:1f:3b:d8:67:1d] ...
14
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3answers
82k views

CentOS 7 Firewall Configuration

In CentOS 6 I could type setup from the command line and I would be presented with a set of tools, one of them being Firewall configuration. I can still do this in CentOS 7, except the list no longer ...
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0answers
16 views

Opensuse 13.2 firewall: allow openmpi

I am trying to run simple openmpi test on two servers. mpirun --report-bindings --host serv1.cell,serv2.cell -np 2 hostname Both servers runs OpenSuse 13.2 and have similar network inteface ...
0
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1answer
63 views

Telnet: Unable to connect to remote host

Related Threads: SMTP server works, but telnet to port 25 does not Can't connect to SMTP server The problem I have a server running Debian 3.2.65-1 and i am having some problems to connect other ...
0
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1answer
29 views

Can't manage / ping Sonicwall's LAN interface from across MPLS

We have two of our sites connected via an MPLS that bypasses our firewall. Traffic between the sites, when hitting our core switch is routed directly to a second interface on our ISP's router. The ...
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0answers
8 views

Zywall USG 50 - Closed out [closed]

We got a zywall usg 50 in our little rack. Some other guy had to forbid a IP to the ZyWall. After doing this, he came to me. We cant access the Webpanel any more. Also no other Services like ssh or ...