Uncomplicated Firewall is a firewall configuration tool for Linux. It acts as a frontend to iptables. Originally designed for Ubuntu, it is available on many Linux distributions.

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UFW Firewall Rules ordering?

I have the following rules on our server within UFW: To Action From -- ------ ---- 22 ALLOW 217.22.12.111 22 ...
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4answers
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Where does UFW (uncomplicated firewall) save command-line rules to?

You add a rule like this: ufw allow 22/tcp The rule is saved, and is applied even after reboot. But it's not written anywhere in /etc/ufw. Where is it saved to? (Ubuntu, using ufw as ...
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1answer
969 views

nginx or port 80 unreachable

After some server hardening, and installing NGINX (whitout modifying the configuration) I somehow cant access nginx from outside anymore. Sadly, I'm not at all an expert in theese things. The ...
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1answer
1k views

Deny from localhost with ufw

I have a service running on port 1339. Is it possible to deny requests from localhost to this port? Currently I have an ufw rule to allow requests from a specified IP but localhost can access the port ...
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1answer
174 views

Cannot directly reject traffic on port 25

My server is running Ubuntu 10.04.4 LTS and I want to reject traffic to port 25. The goal is this: $ telnet {ip} 25 Trying {ip}... telnet: connect to address {ip}: Connection refused telnet: Unable ...
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ufw blocking apt

I have the same Problem as described here, but the given solution doesnt work for me: ufw blocking apt and dns When I add the rule ufw deny out to any, and add the port 80, 443/tcp, ssh-port as ...
3
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1answer
692 views

Ubuntu Server 12.04: How does one configure the firewall during installation?

I'm following instructions to automate the installation of Ubuntu Server 12.04 using kickstart. It works well for automatically partitioning the drives, selecting languages etc. However, it doesn't ...
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How does one configure UFW to allow private DNS requests, but block DNS requests from internet

I have an Ubuntu Server 12.04, with two network cards: eth0 is connected to the internet eth1 is connected to a private network (192.168.10.1) The server is configured as a gateway and hosts DNS ...
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1answer
4k views

UFW: force traffic thru OpenVPN tunnel / do not leak any traffic

I have VPN access using OpenVPN and try to create a safe machine that does not leak traffic over non-VPN interfaces. Using the firewall UFW I try to achieve the following: Allow Access from LAN to ...
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306 views

UFW blocks SSL connections Varnish/Apache2 on Ubuntu 12.04

I have installed Virtualmin on a Ubuntu 12.04 server and I'm using LAMP stack with Varnish (:80) in front of Apache (:8000). However, I cannot access https when UFW is enabled. When I disable UFW, all ...
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1answer
211 views

In ufw is there any way to disable logging for a particular rule?

I am using UFW with a default logging policy of "low". I would like to keep this logging on for the default deny action, but disable it for a particular IP address only. So I'd like to create one ...
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1answer
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How to place a virtual machine in DMZ?

I have an Ubuntu 12.04 server running few virtual machines with KVM. I would like to expose some of these virtual machines on the internet, to make it possible for customers to test the products ...
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Ubuntu Server UFW NAT Issues

*nat :POSTROUTING ACCEPT [0:0] -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE -A ufw-before-input -i tun0 -j ACCEPT -A ufw-before-output -i tun0 -j ACCEPT -A ufw-before-forward -s 10.8.0.0/24 -j ...
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1answer
346 views

UFW: Disable logging of blocks due to optional FIN/ACK message being received

I've recently built a server and decided to use UFW for the first time. I was investigating a possible connection issue (turns out it was their end) but I noticed that the logs are full of entries ...
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1answer
908 views

Restrict traffic to local network and VPN using ufw or iptables

I want to restrict all traffic from my ubuntu-machine to come or go from the local network (eth0) or from or to my VPN (tun0). It should be possible to connect the router in the local network but not ...
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2answers
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How To Set iptables log rules for PSAD with UFW?

For PSAD to work, I need to add the following iptables rules and enable packet logging : iptables -A INPUT -j LOG iptables -A FORWARD -j LOG ip6tables -A INPUT -j LOG ip6tables -A FORWARD -j LOG I ...
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2answers
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Cant forward port 443 to 8443 without allowing 8443 on ufw

I configured port forwarding through iptables and ufw. But there is something I do not understand, I just cant get iptables to forward port 443 to 8443 without allowing port 8443 on UFW. I want port ...
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1answer
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Ubuntu IP Forwarding to virtual ethernet adapter

I've setup Ubuntu server along with ufw as a firewall. To start, I have two networks: Public: 66.xxx.xxx.70 - 66.xxx.xxx.78 Private: 192.168.3.1 - 192.168.3.255 My network config: auto eth0 iface ...
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4answers
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ufw blocking apt and dns

I installed ufw on my Debian system like the following: # aptitude install ufw # ufw limit 22 # ufw allow 80 # ufw allow 443 # ufw enable # ufw status verbose Status: active Logging: on (low) ...
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2answers
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Configure ufw to redirect http traffic to another IP

I'm trying to redirect all HTTP/HTTPS trafic from one server to another (via IP). I do use the ufw firewall. How can I configure it do to so?
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1answer
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How to use ufw to allow ip access by ranges

I am using a datacenter in Hong Kong (clould provider). I have monitoring servers in tokyo and I am using uwf for ubuntu 64 12.04 to limit access. I have never used ip tables, only ufw. My rules on ...
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1answer
344 views

What's the effect of iptables/ufw deny filters on server load?

I'm wondering how scalable it is to add IP addresses or subranges I want to block into ufw. E.g., I do this whenever I discover a particularly bad bot or server farm. As my list grows, I wonder how ...
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1answer
128 views

webserver behind router or switch, multiple IPs available

We are getting a new internet connection 100Mbps UP/DOWN and 4 Static IPs. Also on that connection there will be a webserver that hosts some websites for us. (Nothing too fancy). The problem where ...
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713 views

Firewall blocking some strange communications from source-port 22 to over-seas ip addresses. Should I be concerned?

I'm responsible for a server that serves a single service (ssh) over the internet via port-forwarding through a firewall. The ssh service login is limited to encryption-key only (no passwords ...
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1answer
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UFW/IPTables: how to securely allow authenticated git access with github

This is how I setup my iptables with UFW: sudo ufw default deny incoming (deny all incoming) sudo ufw default deny outgoing (deny all outgoing) sudo ufw allow out 53 (accept outgoing DNS traffic, ...
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2answers
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UFW/IPTables: after setting default outgoing deny, and port 80 outgoing allow, curl still doesn't work

With UFW, I disabled all outgoing and ingoing traffic by default. However, I do allow port 80 in and out: sudo ufw default deny incoming (deny all incoming) sudo ufw default deny outgoing (deny all ...
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3answers
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Rate limiting with UFW: setting limits

UFW's man page mentions that it can setup iptables rate limiting for me: ufw supports connection rate limiting, which is useful for protecting against brute-force login attacks. ufw ...
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1answer
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squid, ufw and iptables

I have a Ubuntu box with Squid installed acting as a transparent proxy server. The config which does the magic is the following. (eth0 is external interface and eth1 is internal.) sudo sh -c 'echo 1 ...
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1answer
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Debian 6. What would be a good UFW initial firewall configuration?

I opened ports 22 25 80 443 993 995 The output of ufw status is... Status: active To Action From -- ------ ---- 22 ALLOW Anywhere 25 ALLOW ...
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4answers
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ufw portforwarding to virtualbox guest

My goal is to be able to connect using remote desktop on my desktop machine, to windows xp running in virtualbox on my linux server. My setup: server = debian squeeze, 64 bit, with a public IP ...
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1answer
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UFW blocking port 80 when it should not

I have these rules in UFW (default deny): 80 ALLOW 10.0.0.0/8 443 ALLOW 10.0.0.0/8 80 DENY Anywhere 443 ...
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2answers
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Opening port 5432 on ubuntu

I am trying to open port 5432 on ubuntu using ufw using sudo ufw allow 5432/tcp I then use nmap to see if port 5432 was opened and i get this: root@domain:~# sudo nmap -sS -O 127.0.0.1 Starting ...
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1answer
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UFW logs blocked request on open port, what am I missing?

Nov 29 15:17:15 hostname kernel: [397768.554884] [UFW BLOCK] IN=eth0 OUT= MAC=[mac] SRC=[ip] DST=[ip] LEN=52 TOS=0x00 PREC=0x00 TTL=52 ID=17050 PROTO=TCP SPT=56152 DPT=80 WINDOW=65535 RES=0x00 ...
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2answers
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How to show the current configuration of iptables with ufw?

This is what I get when I try to see the current iptables configuration: nes@sw-eng:~$ sudo ufw show ERROR: Unsupported action 'show' So, what else is there?
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1answer
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Copy UFW rules between servers

I'm doing a hardware refresh on a my Colo, I just need to copy my UFW rules from my old server to my new server. I dont seem to be able to get them copy all the active rules from my old server to my ...
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1answer
412 views

Recommended ufw port configuration to secure tomcat web-application ubuntu server?

Assuming an ubuntu server operating web applications on Tomcat (with redirection from apache 80 to 8080). What is the recommended port configuration to secure the server? Thanks. P.S.: I would like ...
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1answer
541 views

Can ufw on a kvm host restrict traffic to guests?

I've set up a number of guests running on kvm on Ubuntu. Network access for the guests is via network bridge with br0 sitting on top of eth0. I have ufw running on the host machine and this is ...
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1answer
847 views

Redirect traffic from a single domain to another webserver using Bind9 and ufw

I have a DNS server setup with Bind9 and ufw as the firewall. ufw forwards all web traffic to our web server however I would like to redirect one domain to a different server. Example Servers DNS ...
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2answers
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Turning on UFW stops my e-mail client functioning (both imap and smtp) even though they are allowed?

I am using ubuntu 10.04 on a VPS. Without enabling UFW everythign works fine - imap using port 143. And sends emails using smtp port 587. However, when I turn on UFW a lot of problems are ...
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1answer
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setting up ufw for a website, I want to to disallow everything except ssh, e-mail, and http

I have read the basic instructions here: https://help.ubuntu.com/community/UFW I want to sudo ufw default deny and then sudo ufw allow ssh sudo ufw allow smtp sudo ufw allow www sudo ufw allow ...
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1answer
885 views

SSH freeze when UFW is enabled

I have a small Ubuntu 10.10 server and i recently noticed a weird behavior (not sure if it was happening before). If I have ufw enabled (with default deny all in, allow all out, allow all http, allow ...
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2answers
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Ubuntu ufw: set a rule on a per interface basis

I want to create a rule that allows anyone on eth1 to access port 80. Can UFW do this or should I go back to using Shorewall? To clarify: this is a capabilties question, can ufw handle interfaces as ...
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ufw deny all incoming and outgoing not working! [closed]

I'm sure I'm doing something wrong. I'm expecting my current rules of "denying all incoming/outgoing" to cripple anything network related, but it's not. First, I did: sudo ufw default deny incoming ...
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1answer
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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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2answers
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IPTables rules re-appearing

Folks, I created two machines on SoftLayer's cloud. The machines are Ubuntu 10.4 64 bit, minimal config. I am running into a really strange problem that I have no idea where it is coming from. The ...
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1answer
1k views

Cannot loopback to localhost php gateway causing nginx to timeout while setting up firewall with ufw

I'm setting up ufw for the first time. Using Ubuntu 10.04 LTS on an OpenVZ VPN and have the following rules: sudo ufw allow 22/tcp sudo ufw allow 25/tcp sudo ufw allow 53 sudo ufw allow 80 sudo ufw ...
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1answer
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Should I be using iptables or ufw?

I know of iptables. I know of ufw. I've been using ufw in the past just because it's easier to setup and use. However, which one should I be using? Is iptables more secure? Is ufw more stable? I ...
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3answers
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what's wrong with my ufw configuration on Ubuntu server?

I've setup the ufw firewall for my Ubuntu server on linode as follows: Note that this is in the Lish terminal, unfortunately as soon as I turn on the ufw, I cannot: view my test website via port ...
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1answer
2k views

Ubuntu: How to add an iptables rule that UFW can't create

UFW is working really well for me except in the cases where it doesn't... I want to be able to add another rule manually that will be applied on boot? where should i put this rule? how should I ...
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1answer
780 views

configuring two network interfaces in ubuntu 10.04.1

I have got two NICs configured on a VM - each is tied to a specific network, one is a DMZ, the other is an internal network. I want MySQL to listen on the internal network only and Apache on the DMZ ...