Security :: Firewall Running Perfectly - No Wide Open Ports Detected
Dec 22, 2009
I now have a firewall up and running: almost perfectly. When I use nmap and perform the most comprehensive scan I can think of, it cannot detect any wide open ports (unless bittorent is running) and cannot fingerprint the OS. My last 2 questions about my firewall (I am very happy now) are:
It seems as though Firestarter has been "abandoned" by the developers, and that gufw is more current. Does it really matter which firewall I use because don't they all do the same thing? I like firestarters system tray icon a lot. 2nd question is I have two open|filtered ports. Are these still pretty well protected?
It is very pleasing to see that I have no open ports, because if you were an experienced Windows user like I was, you got used to the fact you were going to have open ports no matter what. Linux's builtin firewall completely destroys the expensive and useless scams they call Norton and McAfee. Linux officially rocks now
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Nov 12, 2010
What are the security implications of closed ports?
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Mar 17, 2011
I am trying to understand why when running nmap against a SonicWALL firewall at a remote location, the SonicWall firewall is saying that most of its 65535 ports are open? I know this cant be correct and remember reading about how some of these network appliances are setup this way to thwart off attacks.
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Feb 14, 2011
Within the documentation of example OpenVPN setups there is a setup that shows an OpenVPN Server with two network interfaces. One interfaces is plugged into the public internet network and the second interface is plugged into the private network.
Normally I assume that it would be best to place the OpenVPN system inside the network behind the router and firewall and open only the ports needed on the router to allow access to the OpenVPN system. All other router ports would be closed. This is the first example they show. To see what I am talking about see page(s) 6-7 here -> [URL]
If one were to use the two interface public facing setup, when would that setup best be justified? I guess if you didn't want to open any ports on the router/firewall then this could be justified but then you have to lock down this public system individually instead of having it protected by the network firewall.
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Sep 9, 2011
I have just switched over from firestart to gufw.I have set all incoming traffic to deny and all outgoing traffic to allow.I have rules set for incoming traffic, and have only opened 1 port on my system for torrents. My router also only has the same port opened which again is for torrents.I use "Network Tools" which is included on squeeze and do a portscan of 192.168.1.100 and 127.0.0.1 I get all kinds of crazy ports coming back as opened. What is even stranger is if I do a few scans, these ports change, so one port on one scan may come up as open, then it will disappear and a different port may show as open.
Mind you none but the torrent port is forwarded in my router, I have no idea what any of these other ports are, or why they are even showing up.What the heck is going on? I dont think this is normal? Am I at any higher risk for attack?
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Jan 23, 2011
how to open firewall ports without using yast. The reason I'm asking is because I'm working on a .sh script for the installation of a couple of programs. Some ports need to be open for the programs to work, I find it really annoying to go to yast and type the ports manually every time. I've looked at /etc/sysconfig/SuSEfirewall2 but can't seem to find anything, I also know that after the changes I will have to stop start the firewall by running:
SuSEfirewall2 stop
SuSEfirewall2 start
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Dec 2, 2010
I cant get any of my usb ports to open ,m trying to open my "usb external hard drive .
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Apr 27, 2010
I have a couple of openSUSE 11.2 machines and each is directly connected to the Internet (they are not behind a router, firewall, etc). I want them to be able to communicate without any firewall restrictions, but keep the firewall rules for all other IP addresses. Is this possible? the software package I'm trying to use randomly chooses a port to use in the range of 32768-61000 and I don't feel comfortable having a port range that wide open on both machines.
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Jul 26, 2010
I am having trouble getting ports to open, on the router that the server is connected to it is set to DMZ, so everything passing through the router should go to the server right? but when I use a port checker none of the ports that I need to be open are. so my question is does ubuntu have a built in firewall that no one told me about? or something that would block me from having the ports open?
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Apr 1, 2010
I would like to ask today how to open up specific ports in Linux firewall (iptables). Recently I have changed the SSH port in server from 22 to 30022 by typing
Code:
# vi /etc/ssh/sshd_config
Code:
Port 30022
"/etc/ssh/sshd_config" 111L, 3027C
And then for the iptables configuration file:
Code:
# vi /etc/sysconfig/iptables
[code]....
How to configure the iptables properly so that my Windows PC can access the Linux with port 30022?
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Jan 11, 2011
I have a question about /etc/services file. If I open ports in firewall, do I need to alter /etc/services file in order for certain apps to work?
kpasswd 464/tcp # kpasswd
kpasswd 464/udp # kpasswd
# Theodore Ts'o <tytso&MIT.EDU>
# 465 is illegal used by eMail Server
smtps 465/tcp # eMail Server
#urd 465/tcp # URL Rendesvous Directory for SSM
igmpv3lite 465/udp # IGMP over UDP for SSM
# Toerless Eckert <eckert&cisco.com>
digital-vrc 466/tcp # digital-vrc
digital-vrc 466/udp # digital-vrc
Above example shows if 465 tcp isn't altered, Postfix MTA fails to listen on 465 tcp port. What if there's a bigger span 3000:7000 TCP/UDP, is there a need to alter each line by hand?
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Apr 20, 2010
How do I open ports 5198/udp and 5199/udp on a slackware based firewall?
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Jul 27, 2010
I'm locking down my laptop. I know I can use a firewall to ensure nothing gets through that I didn't catch, and I certainly plan on using one, but in the meantime, I want to know what exactly is running on my system.
nmap localhost returns:
Code:
james@james-linux:~$ nmap localhost
Starting Nmap 5.00 ( http://nmap.org ) at 2010-07-26 23:33 CDT
Warning: Hostname localhost resolves to 2 IPs. Using 127.0.0.1.
Interesting ports on localhost (127.0.0.1):
Not shown: 994 closed ports
PORT STATE SERVICE
25/tcp open smtp
111/tcp open rpcbind
139/tcp open netbios-ssn
445/tcp open microsoft-ds
631/tcp open ipp
2049/tcp open nfs
Nmap done: 1 IP address (1 host up) scanned in 0.18 seconds
However, I know that localhost goes back to the loopback interface, 127.0.0.1. So, to see what was really open, I ran nmap 192.168.0.108, which is my laptop's IP at the moment.
Code:
james@james-linux:~$ nmap 192.168.0.108
Starting Nmap 5.00 ( http://nmap.org ) at 2010-07-26 23:33 CDT
Interesting ports on 192.168.0.108:
Not shown: 996 closed ports
PORT STATE SERVICE
111/tcp open rpcbind
139/tcp open netbios-ssn
445/tcp open microsoft-ds
2049/tcp open nfs
Nmap done: 1 IP address (1 host up) scanned in 0.14 seconds
Now if I understand correctly, I can attribute 139 and 445 to my Samba share. That I'm okay with. What I don't know is 111 and 2049. Does anyone know what these ports are, what's running on them, and how I could turn them off, supposing that they are a security risk?
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Mar 18, 2011
I'm getting heat from the head networking office that ports 21, 110, and 143 are open. I can telnet to those ports from a remote machine (not localhost) and get a prompt. There does not seem to be anything listening on those ports according to netstat. I've tried using iptables to discard all traffic to a from those ports but I can still telnet to them. This is a lucid desktop machine.
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Aug 16, 2010
How to open RTP UDP ports (port_number : port_number) in openSUSE 11.2 firewall with yast?
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Jan 8, 2010
I'm encountering a strange problem. I need to open and forward all UDP and TCP ports related to VoIPtelephony (5000:32000) in the Suse 11.1 server that's acting as router/firewall in our setup. The ports must redirect to a Asterisk server in the local network. (This server has the IP adress 192.168.0.3)I've opened ports in Yast (Firewall>Ports>Advanced) and putted in some masquerading rulesirewall>Masquerading):0/0,192.168.0.3,tcp,5000:31000,5000:310000/0,192.168.0.3,udp,5000:31000,5000:31000when I do a nmap localhost I get:Starting Nmap 4.75 at 2010-01-08 16:52 CETInteresting ports on localhost (127.0.0.1):
Not shown: 991 closed ports
PORT STATE SERVICE
21/tcp open ftp
[code]....
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Apr 10, 2010
I installed Ubuntu 9.10 recently. I heard that there will be no open ports in the system unless I specifically open one. How do I scan to find a open port in my system.
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Jul 6, 2010
when i enable my ufw it completely shuts me out and closed my internet connection. i installed firewall configuraiton interface and through it defined rules to accept incoming internet connections on port 80, i can see the rules are there but when i enable my firewall it just shuts me out completely again.
when i do(with my firewall enabled):
Code:
$ sudo ufw status
it gives me:
Quote:
Status: active
[Code].....
I also messed around with fwbuilder and iptables but since then deleted fwbuilder(besides i just compiled firewall policy and never actually installed it because of errors while trying to install it. Iptables I cleared with:
Code:
$ sudo iptables -F
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Aug 19, 2010
I am trying to configure Bittorando and iptables using Firestarter. I have got it working but am concerned about security holes.
Let me explain.
AIUI, the Bittornado program contacts the "tracker" on various ports which (from the previously blocked connections in Firestarter) ranged from 4664 to 65532. Therefore, currently I have set this range to be open to allow downloads of the torrent.
However, this seems, IMHO, to devalue to point of having a restrictive exit policy for Firestarter since now virtually all ports are open. I can see nothing on the Bittornado client to restrict the outgoing ports although the "listening" (incoming) ports can be restricted.
I would prefer to have my system locked-down so that the minimal number of ports are open to initiate external connections so is there any way to achieve this with Bittornado?
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Jun 25, 2011
Well I'm kinda a paranoid person, and got bored and ran a port scan from 0 to 500000 and turned up some interesting results, I was wondering how I find the programs tied to each open port. Its my computer and I'd like to very well know what programs are needing these ports and for what usage.
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Sep 11, 2010
A portscan reveals that port 39878 is 'open', service: 'unknown. I deny service for this port in Firestarter FW 'policy' Firestarter does not show any active connection. I am not running any apps, so how can I close this port?
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Jul 1, 2010
Is there a firewall installed and running in 10.04? If so are there any gui tools for configuring it and where are they? If there is not a firewall, what should I install to get one properly up and running?
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Apr 21, 2011
I want configure open source firewall on my office for websites blocking and bandwidth monitoring.
which is the beast free open source firewall..
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Feb 10, 2011
Recommend open source tools that can help in figuring out if we are experiencing a network latency due to the newly installed firewall on our server.
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Jun 29, 2010
I want to lock down my server to allow only certain ip addresses and ports in. I was thinking of doing this through the iptables but someone sugguested I used the hosts.allow and deny files to allow who can access the system. What do people suggest? If I"m trying to ensure no ip's can access my system except the ones I want, how would I do this with just the allow and deny files?
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Feb 18, 2011
I want to know how to add (ports to open)in firewall using command or scriptor any ather method
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Feb 18, 2011
i need to add some ports in firewall(RHEL5) how can i do it using command or script or anything?? i know one method from graphic firewall wizzardtell me other shortcut to add more then one ports
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Jan 27, 2011
Which ports should be open for a mail server for INPUT CHAIN? When I use firewall rules (allow just a few ports), some users complain that they're not receiving messages from other domains. When the firewall is disabled these ports show as open:
Code:
Not shown: 9987 closed ports
PORT STATE SERVICE
21/tcp open ftp
[code]....
Which ports should be enabled?
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Feb 22, 2010
I'm trying to run a command that will let me run some programs. If I run the command in a terminal, then I can launch the programs from it fine, but not from anywhere except that terminal. This is the command that makes things work:Code:export GTK_RGBA_APPS=allbut:exe:checkgmail:swiftfox:firefoxThis command disables RGBA for the programs listed, which seem to have problems with it. I hoped I could use this command to somehow apply it system wide permanently. I've tried adding it /etc/rc.local and rebooting, but it doesn't work.Is there a way of doing this? Or am I barking up the wrong tree entirely? Is there a better way to disable RGBA for certain programs?
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Feb 6, 2010
In my firewall I have these ports open:
21
143
110
[code]...
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