Fail2ban scans log files like /var/log/pwdfail or /var/log/apache/error_log and bans IP that makes too many password failures. It updates firewall rules to reject the IP address.

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3
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2answers
1k views

fail2ban doesn't process jail even though regex matches

I have trouble setting up fail2ban to check the nginx error log for failed http auth entries. Even though the provided failregex works, fail2ban just seems to skip the jail config. I've already tried ...
3
votes
1answer
486 views

is there any valid reason for users to request phpinfo()

I'm working on writing a set of rules for fail2ban to make life a little more interesting for whoever is trying to bruteforce his way into my system. A good majority of the attempts tend to revolve ...
3
votes
1answer
310 views

Fail2ban redirect

I've just finished setting up fail2ban on my Centos reverse proxy server. I was able to get it to block all requests if a certain criteria was met (pretty straight forward). However, I'd now like ...
3
votes
3answers
3k views

Fail2Ban is not adding iptables rules

Fail2Ban is not adding iptables rules to block attackers. I'm running CentOS 6.5 (32 bit) Here's what I did: fail2ban was installed via yum using the epel repo I copied jail.conf to jail.local I ...
3
votes
4answers
656 views

Protect ssh server

I've got a debian-machine running several services, like apache with http and https, jabber and an openssh server for administration. The ssh-server is not running on port 22. It's on something like ...
3
votes
1answer
3k views

fail2ban cannot ban ip on all ports if it's already banned for specific port

I'm using a custom filter in fail2ban to search through it's own log and ban an ip after 5 bans from any of the regular filters. I'm using iptables-allports as action for this. All other filters are ...
2
votes
1answer
11k views

How To use fail2ban for Nginx? [closed]

How can I use fail2ban on an Nginx server? What are the rules to put in the jails.conf?
2
votes
2answers
1k views

“Couldn't find package fail2ban”?

Ubuntu Server 9.10 Hi Guys, I think this one is a simple one... I'm trying to install fail2ban and get the following error: $ sudo apt-get install fail2ban Reading package lists... Done Building ...
2
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3answers
7k views

fail2ban iptables having port 22 and fails to block ssh on custom port

This question is almost same problem like mine but accepted answer doesn't solve my issues In Fail2Ban, How to Change the SSH port number? SSH on port 22 everything works great. After 5 attempts ...
2
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3answers
1k views

Fail2Ban on Apache Server to protect against DoS attacks?

I asked a question on the IT security StackExchange about protecting against DoS attacks. One of the answers was to install Fail2Ban. I talked to the people that administer the server and they told ...
2
votes
2answers
891 views

How to synchronize command calls on Linux

This is my specific problem I need to solve (But my question is different, so please read on even if you don't know what fail2ban is): I'm trying to use fail2ban on a linux server to ban brute force ...
2
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3answers
559 views

Is there any reason to use fail2ban with SSH password logins disabled?

I am setting up an Ubuntu server hosted by Linode. I am stepping through their security guide and they recommend installing fail2ban after disabling password based SSH logins. I don't see the point ...
2
votes
1answer
547 views

Tools to block hack attempts in Apache

Currently I'm using Blockhosts & mod_evasive to "manage" minor attacks & spurious requests, I'm wondering if there is something better/more effective out there. Something that behaves like ...
2
votes
2answers
370 views

fail2ban.action ERROR iptables -w -N f2b-<jail-name>

I've been using fail2ban for a while without any issues. The other day, I decided to stop fail2ban to remove one rule from my default iptables. When I started fail2ban, it started ok (according to ...
2
votes
1answer
415 views

Modify fail2ban failregex to match failed public key authentications via ssh

fail2ban doesn't recognize failed public key ssh logins and I assume that this can be solved by modifying the failregex of /etc/fail2ban/filter.d/sshd.config to match the following line: <date> ...
2
votes
2answers
199 views

Run fail2ban without banning

It is possible to run fail2ban in some kind of "simulation mode" so it does not ban but log somewhere who it would have ban? Running fail2ban on Ubuntu 12.04.
2
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3answers
3k views

Why isn't fail2ban blocking failures?

This below is the output of fail2ban log. Nothing more shows up, but in auth.log I see like hundreds of failures for root user login (someone is bad ass brute forcing). 2011-07-06 01:48:16,249 ...
2
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2answers
3k views

fail2ban save banned ip's after restart

It is possible to save and use _already banned IP's in fail2ban after restart (fail2ban or the whole server)?
2
votes
1answer
47 views

fail2ban rules not coming into effect

I have installed the Apache web server on a stock installation of Ubuntu 14.04, and I am trying to use fail2ban to block requests that check for vulnerabilities. I have put the following in ...
2
votes
1answer
3k views

Fail2ban doesn't start [closed]

I've done some changes to the file /etc/fail2ban/jail.local (a copy of /etc/fail2ban/jail.conf) and saved, but now fail2ban doesn't start. If I erase jail.local, then it start again. So the problem is ...
2
votes
2answers
842 views

fail2ban error on setting iptables on Synology NAS

I setup fail2ban 0.9.1 on my Synology NAS to handle failed SSH attempts. When I startup the jail I get the following errors in fail2ban.log: 2015-02-01 17:22:52,394 fail2ban.jail [30576]: ...
2
votes
1answer
375 views

Fail2ban not working on Ubuntu

I noticed a bunch of those w00tw00t requests coming to my Ubuntu 12.04 server and so I installed fail2ban. I followed these instructions on setting up Fail2ban against w00tw00t requests. I made sure ...
2
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2answers
1k views

fail2ban regex that uses less CPU?

Using fail2ban, I want to ban these spammers who are sending to a spamtrap address: Oct 27 09:04:22 si68 postfix/smtpd[3240]: NOQUEUE: reject: RCPT from unknown[117.197.114.222]: 550 5.7.1 ...
2
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2answers
3k views

fail2ban: stop pop3 login attempts?

How do I set up fail2ban so that all those pesky pop3 login attempts are taken care of? I am using Ubuntu 9.04 and here's an extract from the pop3 log as I see it in the mails that Logwatch sends: ...
2
votes
1answer
155 views

How to change mail “from” name for Fail2Ban email notifications?

I have Fail2Ban sending me emails from various servers but I can't tell at a glance which server because the email "from" name is always just "Fail2Ban". I've managed to set the "from" address ...
2
votes
1answer
145 views

Use of backreferences in fail2ban filters possible?

From time to time, I see collections of suspect "File not found" errors in my Apache logs, basically using the pattern File does not exist: /var/www/file, referer: http://my.server.com/file In ...
2
votes
2answers
708 views

iptables with Cloudflare

I'm using fail2ban to block web vulnerability scanners. It is working correctly when visiting the site if CloudFlare is bypassed, but a user can still access it if going through it. I have ...
2
votes
2answers
1k views

Block IPs that try to exploit common webapp vulnerabilities

Is there an application that goes through the nginx logs and blocks IPs that made requests for common webapp vulnerabilities? I have an nginx web server that serves only static content. I routinely ...
2
votes
2answers
3k views

fail2ban for apache2 doesn't seem to be working

I have a lot of the following error messages in my apache error log: [Thu Dec 16 15:13:24 2010] [error] [client 168.144.92.191] File does not exist: /var/www/mydomain/fud [Thu Dec 16 15:13:24 2010] ...
2
votes
1answer
679 views

Any non-custom way to manage iptables with fail2ban and libvirt+kvm?

I have an Ubuntu 9.04 server running libvirt/kvm and fail2ban (for SSH attacks). Both libvirt and fail2ban integrate with iptables in different ways. Libvirt uses (I think) some XML config and ...
2
votes
1answer
20 views

Should i use Firewalld or Iptables for Fail2ban in Centos 7?

I'm setting up Fail2ban to protect ssh, and I use firewalld, I saw a lot of people recommending to use anaction = iptables-multiport and other solutions using iptables instead of firewalld claiming ...
2
votes
2answers
351 views

Fail2ban critical exception - does not block ips

I'm trying to get fail2ban running on CentOS7 (no SELinux) and it uses firewalld. My goal is to set it to ban Asterisk password fails. Setup was default yum install fail2ban Config-wise I ONLY added ...
2
votes
1answer
103 views

fail2ban did not ban anything, regardless of the settings

this is the first time that i did not find a solution here. so, hopefully it can be solved. i've installed a fresh, new ubuntu minimal system (14.04) with ssh on it. Right after that i installed ...
2
votes
1answer
42 views

Preventing SecAst access from across the network

I have SecAst up and running great, and I realize that any workstation on the network can access the SecAst telnet interface. Is there a way to limit this to only my laptop? I don't want one of the ...
2
votes
1answer
624 views

How does fail2ban 0.9 database storage actually works?

Fail2ban 0.9 introduce database storage to save bans on restart. But I can't find out the actual mechanism of it work. There is dbpurgeage parameter which controls lifetime of old bans, defaults to ...
2
votes
1answer
687 views

How to use so called action variables in fail2ban?

I've seen a few mentions of these in the docs and misc scripts, but nothing concrete on exactly how they are used. Could anyone give me some examples? Is it just a case of myvar=7 . . . [ssh] ...
2
votes
2answers
157 views

Can Fail2Ban recognise failed logins to locked accounts?

I have locked the root account on my server with passwd -l root and so an attempted login results in the following in /var/log/auth.log: User root not allowed because account is locked Fail2Ban ...
2
votes
3answers
305 views

fail2ban-apache not blocking IP

I'm trying to configure fail2ban, I attempted to log into my web server numerous times to trigger the rule and looking at my iptables it seems to have worked: Chain fail2ban-apache (1 references) ...
2
votes
1answer
920 views

How can I use fail2ban to block scrapers?

I have a media site and problems of users coming along and scraping all of the content.I placed a invisible URL on the page to catch spiders that immediately blocks the ip, but some people have ...
2
votes
1answer
1k views

Is it possible to rate limit HTTP requests with iptables?

I've got a lot of vulnerability scans via HTTP requests (trying to get /password.txt, etc). Currently I use fail2ban to parse Nginx access log to count 404's and ban attacker ip addresses. I'm ...
2
votes
1answer
73 views

Fail2Ban not banning IPs with different ports

I am getting different SSH attacks from the same IPs and they are getting banned. But they are using a different port and all they have to do is change the port to bypass the ban. Dec 28 23:16:57 ...
2
votes
0answers
129 views

“Centralized” fail2ban only banning attacks to local host

I'm trying to run fail2ban on the rsyslog server that gathers auth logs from the rest of our servers. I'm interested on getting notifications working as a first step. My problem is that fail2ban only ...
2
votes
0answers
83 views

Blocking bot by multi url pattern with fail2ban

I'm seeing a multi url pattern similar to following lines in nginx logs recently. GET / GET /somepath/ GET /otherpath/ GET / GET /somepath/ GET /otherpath/ ... I'm already using fail2ban for ...
2
votes
0answers
505 views

fail2ban fails to block from auth.log with directadmin

i'm using directadmin on a Ubuntu server. i recently installed Fail2Ban. but i'm still recieving "Brute-Force attack" email from directadmin. my jail.conf (only the auth.log jails!): [ssh] enabled ...
2
votes
1answer
279 views

Multiple IP Addresses in fail2ban

I just got a barrage of pop3-login attacks on one of my servers. I was surprised that fail2ban wasn't stopping them, then I realized that the service is listening on multiple IP addresses, and the ...
1
vote
3answers
1k views

Setting up fail2ban to ignore connections behind a dynamic IP

Using fail2ban to secure an Ubuntu 12.04 x64 Server on DigitalOcean, while editing /etc/fail2ban/jail.local there's this part: [DEFAULT] # "ignoreip" can be an IP address, a CIDR mask or a DNS host ...
1
vote
4answers
107 views

Securing debain with fail2ban or iptables

I'm looking to secure my server. Initially my first thought was to use iptables but then I also learnt about Fail2ban. I understand that Fail2ban is based on iptables, but it has the advantages of ...
1
vote
3answers
716 views

Firewalls (ufw vs apf) on Ubuntu

On my LAMP servers, do either of the firewall interfaces (ufw or apt) allow you to setup rate limiting to automatically ban brute force attempts (e.g. via SSH)? Or, is it best to install fail2ban in ...
1
vote
2answers
714 views

Software vs. Hardware Appliance DDOS & Firewalls [duplicate]

I run several Ubuntu Servers (virtualized) and have fail2ban installed for DDOS mitigation. For a firewall, each server has iptables. I'm evaluating my security options and was wondering how well ...
1
vote
1answer
4k views

Fail2ban don't want to start the server

I just installed fail2ban on my Ubuntu 10.04 server. I modified my jail.conf like this : http://pastebin.com/tEeM2hxe When i try to start the client it returns : ERROR Could not start server. ...