Tagged Questions

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

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0
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0answers
4 views

linux: how to troubleshoot forwarded port? [migrated]

My home internet connection has a static IP address (eg: 123.123.123.123) I have configured my router to forward port 9000 to an internal host (192.168.1.101). That host is running Ubuntu 14-04. ...
-2
votes
1answer
37 views

How to open port with iptables [on hold]

I wanted to open port in centos and after executing openning port commands, the iptables caontents is like below: # Generated by iptables-save v1.3.5 on Thu Nov 20 17:09:28 2014 *filter :INPUT ...
1
vote
1answer
41 views

Why is fail2ban not banning this attack?

I have fail2ban installed to ban bruteforce attempts on the ssh password. There are business requirements for not disabling password authentication on this machine. fail2ban was installed using the ...
-1
votes
0answers
12 views

Route Windows application to specific network interface [migrated]

I have two connections (one wired, one wireless, if relevant). One connection passes thru a proxy (which is not under my control) and is domain controlled. The other is a simple wireless connection ...
3
votes
2answers
68 views

Can't access Exchange OWA from Wireless Subnet - Firewall rule?

The Problem The issue is that I can't access port 80 (or 443) on the Exchange server, unless I add a blanket rule to allow all traffic from the client to the server's subnet. If I add a rule to ...
0
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0answers
13 views

Connections from virtual host to internet OK, but to rest of LAN, broken [migrated]

In a notebook running Ubuntu 14.04 I have installed VirtualBox and created a virtual server with Windows 7. The PC is connected to a 192.168.x.y LAN. The virtual server is in a host-only network with ...
-2
votes
1answer
33 views

How to setup firewall with 2 ISP [on hold]

I need to setup a firewall with connections from two separate ISPs (Link1 and Link2). Link1 should be used for all traffic by default. Then, if and only if Link1 fails Link2 should be used for all ...
2
votes
1answer
35 views

DNS grey listing and long retry intervals - standard practices?

My company's ISP has implemented what I'll term DNS "grey listing" (or they have a configuration problem) - they are blocking inbound DNS queries between [resolver IP, server IP] pairs that haven't ...
0
votes
1answer
24 views

Configure firewall and proxy server or just firewall for outbound connections

I'm actually a software developer and I am working on a web application which uses Recaptcha. I am using Asp.Net C# in a web form application. I am having an issue with the server trying to verify ...
1
vote
1answer
22 views

Cannot Ping Devices Across Interfaces for Shorewall Single IP Three-interface Firewall on Debian Wheezy

Summary I am currently working on a three interface software firewall using Shorewall 4.5.5.3 on Debian Wheezy, and I'm having some difficulty with the loc (eth2) and dmz (eth1) interfaces. The fw ...
0
votes
1answer
18 views

How can I adapt this technique of using a proxy (in firefox) to wget and yum ?

I work in a large organization where some people have extremely restricted internet access and some are given a fairly large amount of freedom. The way my organization manages this is by running a ...
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votes
0answers
15 views

Code to trace when Blocked webpage is open [closed]

So, I have a piece of code that (should) block websites for me. Thats great, although, id like to know how I could code something, not necessarily a .bat, to log when the User tries to open a blocked ...
-1
votes
0answers
31 views

Firewall rules for forwarding http traffic NOT on port 80 [on hold]

We have an older generation Netgear Firewall/Router. We cannot do NAT on it but we do DHCP on it. Will this scenario work..??: We have web traffic coming into the network and hitting the Netgear ...
1
vote
1answer
61 views

My iptable rules do not allow VPN connections

I have installed OpenVPN on my Archlinux server and modified my iptable rules to allow incoming traffic on port 1194 and forward it to the tun0 interface. When I disable/stop the iptables, the OpenVPN ...
0
votes
1answer
34 views

iptables setting output default to DROP

I have two servers: one web, one database. The db server is on a private network. I thought I needed to restrict the default OUTPUT on the web server to DROP and created OUTPUT rules to to ACCEPT ...
0
votes
0answers
38 views

Blocking HTTPS content with a Watchguard (Websense) vs. SQUID and SQUIDGuard using Transparent Proxy mode

I'm trying to compare these 2 solutions when it comes to content blocking : 1 - A pFSense appliance with SQUID and SQUIDGUARD packages configured 2 - A Watchguard FW that uses Websense So, in order ...
1
vote
1answer
40 views

Linux VPS settings to allow $_SERVER['REMOTE_ADDR'] to get client ip [closed]

I have unmanaged VPS server. I am trying to get client IP form PHP $_SERVER['REMOTE_ADDR'] but it's always gives me same for all users that is server internal IP. I have done some R & D and got ...
0
votes
1answer
14 views

Skype Group Chat in a secured location?

When working in a secured location - some place that uses HTTPS inspection for the firewall, possibly application level filtering, etc - how do you get Group Chat to work correctly in Skype? Adding ...
0
votes
0answers
13 views

Cannot block team viewer through TMG Server 2010

I am just re configuring the firewall in our computer lab and I have created a block URL list. In it are the URL's to the team viewer: http://dyngate.com/ http://teamviewer.com/ This is set ...
0
votes
0answers
19 views

Trace IP traffic to physical machine under Linux

In my firewall logs I recently see frequent connection attempts from a 10.0.0.0/8 network. This network is used by VirtualBox, but I can exclude that these packets come from those. No physical machine ...
0
votes
1answer
23 views

Limiting number of simultaneous connections to certain host on windows

I have an application which doing TCP connections to some host, accidentally it could be configured to make a lot of connections to that host and overload it. Is there Windows firewall application ...
0
votes
2answers
18 views

Rsync through secure head-node on storage cluster

I wish to use a specific head-node as contact address for my rsync backups, I do no wish to have the backend accessed directly, as it is not as hardened, nor as compatible with the rest of my ...
-1
votes
0answers
19 views

WatchGuard (XTM25) Https-Proxy DPI WebBlocker [closed]

I got a new setup with WebBlocker. It blocks the page besides certificates problems wich are not the main problem. I do applied local override, put the password and the page unblock, it loads only ...
0
votes
0answers
34 views

Cisco 877 configuration with multiple firewalls behind in parallel using public IP's

I would like to ask how I can configure my cisco 877 adsl router to have multiple firewalls installed in parallel behind the cisco 877 router. I have enclosed a diagram of what I am trying to achieve. ...
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votes
2answers
28 views

How to allow all clients access to remote MySQL server? [closed]

So I followed this guide to gain remote access to a MySQL server for my laptop. However, my IP changes and I want to be able to access the server outside my network. How can I allow any client IP ...
0
votes
1answer
12 views

Ubuntu UFW setup on database server for connections to a varying array of clustered applications

I'm a little confused and could use some clarification. Let's say I want to deny all connections to a mongodb server, except for to SSH from my IP and from my IP to port 27017. The way I understand ...
0
votes
1answer
21 views

How to close specific port with SuSEfirewall2?

I'm opening specific ports in a SuSE 11 server to do ssh forwarding. After I finish, how do I close only the ports that I opened? I tried SuSEfirewall2 close EXT TCP 4050 but it seems to close ...
0
votes
1answer
15 views

CentOS - how to tell what conf file CSF (firewall) is using? csf.conf then restart not updating

in /etc/csf/csf.conf the following is setup LF_CPANEL = "5" LF_CPANEL_PERM = "3600" restarting csf by doing the following csf -r does not seem to have an impact on the above attributes. ...
0
votes
0answers
21 views

Why need DHCP Relay (Watchguard) inside the Trusted network?

I run a small network that looks like this: { Win 2008 server , desktops , Wifi AP} -> Switch -> Watchguard XTM21 firewall (the Switch is connected to the XTM's Trusted interface ; the XTM ...
0
votes
0answers
22 views

UDP multicast stream on win server 2k8 R2

so i have 3 mega PCs with win 2k8 installed on them having: 1st) 1 internal NIC and 1 external 2nd) 2 internal NIC and 2 external 3rd) 2 internal NIC and 4 external same stream put on any NIC on 1st ...
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0answers
19 views

Dovecot/Postfix mail server replies to [SYN] with [RST, ACK] when user attempts to connect (POP3). Likely iptables?

Currently I am trying to trouble shoot an e-mail server that will allow users to send e-mail, but not log in to the server (POP3) or receive e-mail using their Outlook clients. Previously this was ...
0
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0answers
15 views

Fail over in Lokiwall Firewall

I have configured lokiwall firewall on my linux machine having multiple interfaces. Dual Routing works fine. However, I wanted to know how does the fail over happen in case a link goes down. Do the ...
0
votes
0answers
44 views

Force all traffic from one user through an OpenVPN tunnel on Debian 6 with iptables and ip route

I’m trying to force all traffic of one user through an OpenVPN tunnel. It is giving me grey hairs. The current situation is that I can either allow all traffic for this particular user, and it will go ...
0
votes
0answers
32 views

Secondary DPM server and access to protection agents at primary server

Disclaimer: This is not an ideal setup. In a perfect world we would have a direct two-way VPN between our site and the remote site. My task is to enlighten the consequences of running a System Center ...
1
vote
1answer
91 views

How to ban Syn Flood Attacks using Fail2Ban?

In my log, I am frequently seeing dropped ips like this: > Oct 30 17:32:24 IPTables Dropped: IN=eth0 OUT= > MAC=04:01:2b:bd:b0:01:4c:96:14:ff:df:f0:08:00 SRC=62.210.94.116 > ...
0
votes
1answer
55 views

Do blocking input ports increases security?

1-Do blocking unused input ports in firewall increases system security? How? (as there is no daemon listening on those ports anyway) 2-Do dropping those unused ports will positively or negatively ...
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0answers
30 views

Intermittent SSH problems with a specific server from a specific Wifi router

I've been ssh'ing into a specific server from my home office via Wifi and Time Warner Cable internet for years with no problem. In recent months, I started having problems, where I'd be unable to ...
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0answers
10 views

Using a Barracuda F400 Firewall Router Without a Modem

I'm looking into a problem where VoIP phones don't ring for some of the incoming calls that I believe might be due to the network configuration. Do you need a modem if you are using a Barracuda F400 ...
0
votes
1answer
27 views

Fail2ban jail.local vs jail.conf

Does jail.local file act as an override to jail.conf or as a replacement to jail.conf? When I was learning about Fail2Ban from tutorials, most of them usually say either to copy jail.conf to ...
1
vote
1answer
40 views

MySQL on LAN not working when IPTables enabled

I have two Centos VM. The IP Addresses are as follows : VM_1 => 10.99.0.10 VM_2 => 10.99.0.12 Apache and PHP are in VM_1 and MySQL is in VM_2. Both are having iptables rules. VM_2 is working ...
1
vote
0answers
28 views

PF rule for Continuity

So it looks like the Continuity on OS X 10.10 creates network interface on the fly (utun2 here) and my PF blocks it, so that I can't make/answer calls. I'm not an admin, just use the IceFloor for PF ...
0
votes
1answer
52 views

Can I block inbound traffic from a certain ISP

The problem My server keeps getting DDoS attacks from IP's belonging to Ecatel in The Netherlands. I wrote them a month ago and still haven't heard anything, and keep blocking individual IP addresses ...
0
votes
0answers
16 views

Publishing Multiple SSL Connections via TMG

I am using a Microsoft TMG 2010 as my Firewall. It is configured in a Three-legged approach, with public facing servers in DMZ. There are two public servers. Once is a Citrix Access Gateway which ...
1
vote
2answers
85 views

Test port reachability from a remote host even though the port is not bound to a service?

I need to check whether a remote host is able to reach a specific port. At the time of test the service bound to that port will be down. The possible issues that the test would address would be : ...
0
votes
0answers
28 views

nslookup gives timeout based on request - what gives?

I have the following strange problem with the DNS lookups in our Windows domain (dns service runs on the domain controller): from machine 'A': dns request for machines in the same network zone ...
0
votes
2answers
50 views

Cisco 887VA - Cannot open port 110

I am trying to configure a Cisco 887VA at work to open port 110, but no matter what I try, it doesn't seem to work. The router is accessed from within the building via a web UI but require CLI ...
0
votes
0answers
43 views

How can I log and maybe even block IPs that send lots of incoming UDP traffic?

we run a voice / teamspeak server which receives legitmate traffic on port 9987 from many ips. Sometimes we get DDoSed. So people use single Servers and send 1-3 Gbits of UDP Floods to that port. This ...
0
votes
0answers
13 views

Smoothwall firewall seems to be preventing “large” uploads

One of our customers has a Smoothwall firewall at the edge of their network. External users should be able to use a mobile app to upload images. The images are sent as base64 encoded strings in a JSON ...
0
votes
1answer
30 views

Making a server “read only” except for me (what the inbound/outbound rules mean)

I have an ec2 instance. It will start a webserver, and my public ip is myip. I ssh into my machine. What should incoming and outgoing rules? Why? I want only my ip to be able to change things on the ...
0
votes
1answer
40 views

Cisco PIX Firewall Version 6.3(5)

I am unable to ssh to any servers. I've exhausted every possible thing except the corporate firewall. Its an old cisco pix firewall. [model] Cisco PIX 501 I'm trying to figure out 1) how to ...