a technological barrier designed to prevent unauthorized or unwanted communications between computer networks or hosts
8
votes
1answer
292 views
Replacing my firewall rules
I've had an init script for many years that configures iptables for me and it has worked like a champ until now. After upgrading from 10.04 to 12.04 I started having firewall problems where the ...
3
votes
1answer
251 views
How can I block a range of IPv6 addresses?
Are there any IP blocking applications or firewalls that support IPv6?
The ones I know about (pgld, moblock (sunset?) , nfblock, iplist (looks old)) are only for IPv4.
2
votes
1answer
50 views
How do I allow local subnets in ufw?
I recently got IPv6 connectivity at home and now I would like to allow connections to my home server via IPv6 from the LAN only. The trick is that the IPv6 address/prefix assigned to the server is ...
2
votes
1answer
235 views
How to pass traffic from static ip on my router through Ubuntu firewall to LAN ip
I have a router that has 5 static ip addresses set on it. These external static IP's are mapped to internal IP's on our LAN. We currently have no firewall or proxy set up, so I cannot monitor user ...
2
votes
1answer
345 views
Writing a simple firewall with iptables
I'm learning how to use iptables and I'm writing a very simple firewall on Ubuntu.
Using just the filter table, I added the following rules
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P ...
2
votes
1answer
271 views
Linux Firewall NAT Port Forwarding Issues
At my home I have a Linux server (it's only job is NAT, DHCP, and DNS) with Ubuntu 10.10 Server 64-bit.
I have webmin installed on the server too, but I do know my way around a command line quite ...
1
vote
1answer
53 views
Unable to connect through Java programs in Ubuntu
I am unable to connect to any host through Java programs, getting
java.net.ConnectException: Connection refused.
Does it have anything to do with Ubuntu firewall configurations or any other ...
1
vote
1answer
267 views
Firestarter preventing Firefox accessing internet
I have recently had an issue with Firestarter preventing Firefox accessing the Internet. I have used Firestarter in the past with Hardy Heron and recently switched to Precise Pangolin.
The policy ...
1
vote
1answer
1k views
Installed Xubuntu desktop on Ubuntu 12.04 server and now can't connect via SSH
I have a ubuntu 12.04 server that I could connect to fine using ssh over the internet. I installed the xubuntu desktop on it, didn't change any settings, then suddenly ssh stopped working.
I can ...
1
vote
1answer
65 views
How to add a rule for loggin packets in ufw
I'm seeing a lot of connections with source 0.0.0.0 and destination 0.0.0.0 in conntrack. I want to log these packets which have source 0.0.0.0 and destination 0.0.0.0 so that I can digg this issue ...
0
votes
1answer
53 views
Change UDP port with iptables for VPN clients
What I want to do is say that for all UDP connections on interface ppp0 that have a destination port of 53, change that destination port to 1053.
I am attempting to change the destination port of UDP ...
0
votes
1answer
143 views
UFW 'default deny incoming' doesn't work
I have UFW enabled, 'default deny incoming' set and no any additional rules, but I still can access all ports from other PCs.
I have to manually block each port. What can be wrong?
2
votes
0answers
42 views
Is there a firewall that blocks a process and shows a dialog with buttons Allow, Drop, Disable?
Currently I use ufw and Firestarter, and I'm just learning how to use a firewall.
When I used windows there were a couple of firewalls that could block a process which tried to establish connection ...
2
votes
0answers
99 views
Failed network lookup
I'm running Kubuntu 12.10. I am having three networking problems that I think might actually have a common cause, even though they are in apparently unrelated areas. I had them in 12.04 also:
When ...
2
votes
0answers
209 views
Why is SSH not accessible after installing KDE on Ubuntu Server?
I installed KDE onto my Ubuntu server, which is operating as a file server.
It installed a firewall that wasn't there previously. I can't reach any of the services I had operating on the box now, ...
1
vote
0answers
39 views
New Server - apache will not serve outside LAN
New server, running well 12.04 LTS on HP ML350.
Apache = great, inside our LAN.
Apache = timeout, from WAN (NAT forwarded from firewall).
I have cleared all Iptables, read & checked every ...
1
vote
0answers
22 views
Can not permanently clear iptable rules
I use the following commands to flush all iptable rules:
sudo iptables -F
sudo iptables -X
sudo iptables -t nat -F
sudo iptables -t nat -X
sudo iptables -t mangle -F
sudo iptables -t mangle -X
sudo ...
1
vote
0answers
55 views
How should I configure Ubuntu firewall?
Just discovered Gufw, and I'd like to set it up. But I haven't found any documentation telling me what I should/should not allow. I'd like to be able to use it but the only documentation on the web ...
1
vote
0answers
262 views
Configure Firewall to Take Confirmations
I want to have a firewall program for my Ubuntu 13.04 which will ask me for confirmations when a program wants to connect to the Internet. It should have options like Allow, Block etc. So is there any ...
1
vote
0answers
171 views
How I can connect the syslog-ng with a mysql database?
Hi guys I want to use a syslog-ng server for logging data from the firewall and I get Data from the Firewall in the file /var/firewall.log but now I want that the logs go to a database. For this I ...
1
vote
0answers
37 views
How to load firewall before network?
How can I ensure iptables gets up before any network adapter gets up?
And can network be stopped to be brought up if there is an error in the firewall rules?
For exiting and future network adapters. ...
1
vote
0answers
197 views
How to change Port 27000 from filtered to open status
In my ubuntu box I am running flexlm licensing software on port 27000 and I am able to pull the license from the this port to run the simulation software locally.
I am also trying to run the same ...
1
vote
0answers
67 views
ssh client times out to some servers, works on others
I have a strange problem and I'm not sure where to begin. My ssh client works on some servers but times out on others.
Obviously, I checked that the servers are accessible via ssh from other ...
1
vote
0answers
202 views
Firewall stopped and disabled on system startup ERROR: problem running ufw-init
I am trying to set a VPN server on my PC (Ubuntu). I am following a tutorial , http://cviorel.easyblog.ro/2009/02/09/how-to-set-up-a-vpn-server-on-ubuntu/.
I made changes in various files including ...
1
vote
0answers
217 views
How to find out what is blocking a port
I have 3 machines:
Machine A - local network
Machine B - local network
Machine C - external network
Local network has a dynamic IP and Dyndns is set up to forward it.
I have ssh on Machine B ...
0
votes
0answers
20 views
is ninja working together with ufw?
am testing ninja and ufw together, so last weekend
there seemed to be no problem.
today my provider did not work any more. internet-connection
was fooling around (it is paid).
is ninja confusing ...
0
votes
0answers
78 views
Iptables: deny all traffic from IP except for ports 80, 22222, 22223
I've got 2 servers:
ClearOS
external interface 192.168.1.90
internal interface 192.168.3.1
Ubuntu Server:
connected to ClearOS to IP 192.168.3.90
I need to deny all traffic from IP ...
0
votes
0answers
19 views
UID based routing doesn't work
I have a 12.04 LTS server with two NICs. They are connected to different networks.
# ip route list table main
default via 192.168.1.254 dev eth0
192.168.1.0/24 dev eth0 proto kernel scope link ...
0
votes
0answers
84 views
How to open port 5432 for Servoy (Eclipse) PostgreSQL database server
I'm trying to install Servoy Developer on Ubuntu 12.10. I get a problem during installation with the bundled PostgreSQL database server, because the port 5432 is closed.
I tried the following ...
0
votes
0answers
34 views
Wifi hotspot service on Precise without disabling ufw firewall?
I've been using 12.04 LTS for a while, and for my own sanity and security, I've configured my ufw firewall to deny all incoming, and for outgoing just allow these ports:
TCP 80, 443 for web-browsing
...
0
votes
0answers
61 views
How can I open ports on ubuntu server?
Hello I am running my server and since the ip is not static (my ISP won't give me one because I need to be a commercial customer) I have to use a service like DynDNS but the site is only accessible in ...
0
votes
0answers
33 views
Configuring a firewall to drop idle connections after 30 seconds
I'm trying to reproduce a bug with gvfs that normally only happens after an hour or two. But I'm trying to make it happen after just 30 seconds so that I can work on a patch.
Basically I'm trying to ...
0
votes
0answers
27 views
Cannot get Samba past firewall
I have two interfaces. One (eth0, 192.168.1.x) is my network, my internet connection. I pay for my own because of bandwidth issues. The other (eth1, 192.168.0.x) is the other occupants' LAN that I ...
0
votes
0answers
32 views
Running wifi hotspot on 12.04 without stopping the ufw firewall?
I've been using 12.04 LTS for a while, and for my own sanity and security, I've configured my ufw firewall to deny all incoming, and for outgoing just allow these ports:
TCP 80, 443 for web-browsing
...
0
votes
0answers
26 views
Allow hotspot service to run on Precise without compromising the firewall?
Well, I've been using Ubuntu 12.04 LTS for a while now, and for my own sanity and security, I've configured my ufw firewall to deny all incoming, and for outgoing just allow these ports:
TCP 80, 443 ...
0
votes
0answers
44 views
gufw set to “deny incoming” and “deny outgoing” still allows me to use internet with browser, what gives?
I've been trying to setup gufw. I would have thought that if I denied outgoing and incoming I should not be able to do anything outside of my local computer... but I still can use the internet, etc. ...
0
votes
0answers
21 views
How to make Firestarter resolve hostname each time? trying to deal with connecting w/dynamic ip
I'm trying to connect to ubuntu running firestarter with a cell phone. My ip changes so i dealt with that with no-ip and the first time i connect, everything is fine. But if my ip changes, and i ...
0
votes
0answers
72 views
setup bridge firewall
I want to setup bridge on ubuntu 12.04
something like this
LAN --> ubuntu bridge -->default gateway-->Internet
do I need 2 eth interface?
can I setup using ethernet to connect to LAN and wlan to ...
0
votes
0answers
64 views
How can I turn off ufw blocking nodes
I have set up ufw on a couple of servers and allowed every connection between those servers since the need to communicate with each other without any restriction.
Now, ufw sometimes blocks connection ...
0
votes
0answers
299 views
Problems allowing outgoing multicast in ufw
I am having problems configuring the uncomplicated firewall (ufw) to allow outgoing multicast traffic. I am blocking all in and outgoing connections as the default policy. I have supplemented with the ...
0
votes
0answers
98 views
Setup of UFW (Uncomplicated Firewall) on network that contains proxy
Trying to make a proper setup for UFW (Uncomplicated Firewall). I have network that's behind proxy.
Setup I need it that some of the network computers have to be able to browse everywhere, and
some ...
0
votes
0answers
58 views
Firestarter is not working!
I'm new on Ubuntu and running v12.04 with MS Windows 7 on same machine. I've installed Firestarter and it is not working. Installation is fine, but it blocking all access to internet. I've configured ...
0
votes
0answers
172 views
isc-dhcp not starting
I am currently trying to build a dhcp and firewall server for my home.
I followed the instructions posted on the Ubuntu Forums about setting up such a server.
As far as I can tell, I don't have any ...
0
votes
0answers
770 views
UFW port forwarding
I use UFW and here is my setup:
eth0 is configured as a bridge interface (br0):
inet adr:10.0.4.10 Bcast:10.0.4.255 Mask:255.255.255.0
eth2 is connected to a private network:
inet ...
0
votes
0answers
123 views
ufw firewall port deny access
I installed red5(version 0_9_1) on my Ubuntu 12.04 server and I use ufw firewall.
I want just an ip address to connect to port 5080 and protocol rtmp to see my flv movie.
for test I have allowed IP1 ...
0
votes
0answers
357 views
Internet sharing and file sharing on eth1 for wired users and wlan0 for wireless users through squid, dansguardian & Hostapd
I have 3 network cards installed in my Ubuntu 10.04 server and I want to configure Internet sharing and file sharing on eth1 for wired users and wlan0 for wireless users through squid and ...
0
votes
0answers
110 views
iptables block certain lengths
I'd like to start off saying I am a beginner with iptables. I seem to be having issues with my iptables.
I'd like to block incoming packets greater than 150 bytes. I have a copy of an exploit that ...
0
votes
0answers
324 views
no ipv6 connectivity with Hurricane Electric tunnel; firewall issue?
I am trying to set up an ipv6 tunnel through Hurricane Electric. So far, I have no connectivity;
ifconfig:
he-ipv6 Link encap:IPv6-in-IPv4
inet6 addr: fe80::c0a8:164/128 Scope:Link
...
0
votes
0answers
169 views
cannot login to apache JAMES Remote Administration Tool
Is there some reason I get denied when trying:
# telnet localhost 4555
JAMES Remote Administration Tool 2.2.0
Please enter your login and password
Login id:
root
Password:
root
Welcome root. HELP ...
0
votes
0answers
103 views
APF Firewall makes SSH hang sometimes
I noticed that when apf-firewall is turned on, then my ssh sessions are somethings hanging or closing.
It happens when:
I leave the ssh console alone for some time - Then the connection closes
I ...
