Questions tagged [fail2ban]

Fail2ban scans log files (e.g. /var/log/apache/error_log) and bans IPs that show the malicious signs -- too many password failures, seeking for exploits, etc.

Filter by
Sorted by
Tagged with
51 votes
5 answers
232k views

vivid - failed to connect to upstart: connection refused

Just updated via do-release-upgrade and now certain upstart jobs such as fail2ban and plexmediaserver will not start (have tried reinstalling) $ sudo service fail2ban start Job for fail2ban.service ...
matty87a's user avatar
  • 511
48 votes
3 answers
35k views

potential ufw and fail2ban conflicts

Will running both fail2ban and ufw cause problems? I noticed that fail2ban modifies iptables rules, but ufw already has a ton of iptables rules defined... so I'm not sure if fail2ban will mess these ...
Adam Monsen's user avatar
  • 2,215
39 votes
3 answers
125k views

How do you view all of the banned IP's for Ubuntu 12.04 via the command line?

I can't seem to find a quick command to just view all the banned IP's on the server. Or is there a file I can just edit? I'm guessing fail2ban is the one that inputs all the IP's to ban. Where do I ...
Patoshi パトシ's user avatar
17 votes
2 answers
3k views

IP getting access even after blocking

78.128.113.62 - - [04/Jan/2020:19:59:33 +0530] "GET /efk-dashboard HTTP/1.1" 404 66914 "-" "python-requests/2.13.0" There are multiple access records like this even after I have run the commands ufw ...
Joshi's user avatar
  • 343
13 votes
3 answers
12k views

How do I tell if my brute force protection (fail2ban) is running?

I'm not sure if my fail2ban is running. How can I tell if it's currently running? Also, how do I tell if it is even running on startup?
Patoshi パトシ's user avatar
10 votes
5 answers
14k views

Fail2Ban or DenyHosts to block invalid username SSH login attempts

Is there a way to automatically block IP address when a user tries to login as any invalid username? I already have: [ssh] enabled = true port = ssh filter = sshd logpath = /var/log/auth.log ...
slayton1213's user avatar
7 votes
1 answer
10k views

Block badbot with fail2ban via user agents in access.log

How can I create a filter to block these with fail2ban? 476 Mozilla/5.0 (compatible; BLEXBot/1.0; +http://webmeup-crawler.com/) 892 ltx71 - (http://ltx71.com/) 5367 Mozilla/5.0 (...
alebal's user avatar
  • 463
7 votes
1 answer
4k views

Why /var/log/auth.log is using diffrent timezone?

I've installed fail2ban on a Ubuntu box (14.04) but it didn't work correctly. As I tried to inspect the reason, I discovered that the timezone which is being used by the /var/log/auth.log file is ...
Minh Danh's user avatar
  • 454
6 votes
1 answer
6k views

unable to install fail2ban on ubuntu 18.04

I installed ubuntu server(18.04 version) a few days ago. and I tried to install fail2ban with apt tool but couldn't do that. Here's some information on my situation. root@ubuntu:~# cat /etc/os-...
NoFence's user avatar
  • 769
6 votes
4 answers
13k views

Fail2ban fails to start after update?

I have been using fail2ban for a while on my Ubuntu server. Recently (after upgrading to ubuntu 15.04 I assume) fail2ban has been failing to start. Initially, this was because the port option had ...
starbeamrainbowlabs's user avatar
5 votes
2 answers
20k views

Fail2ban Error on start

Recently, I have tried restarting Fail2ban and I have received an error, making it impossible to start... The full error I received from systemctl status fail2ban is as follows: Jan 03 18:27:02 ...
NerdOfCode's user avatar
  • 2,488
5 votes
2 answers
11k views

Job for fail2ban.service failed because the control process exited with error code

I have installed fail2ban on my server (OS: Ubuntu 16.0.4 LTS). When I try to start it, I get the following error message: Job for fail2ban.service failed because the control process exited with ...
Homunculus Reticulli's user avatar
5 votes
1 answer
1k views

How should I write the fail2ban -> apache-badbots.conf rules?

I often have to add new rules to the apache-badbots.conf file, and every time I have the doubt that it no longer works... For example, this is my current apache-badbots.conf file: [Definition] ...
alebal's user avatar
  • 463
4 votes
2 answers
4k views

Fail2Ban regex SSH will not match auth.log

I'm trying to get Fail2Ban to work with the SSHD config provided. When I run: fail2ban-regex /var/log/auth.log /etc/fail2ban/filter.d/sshd.conf The output is: root@fw:/etc/fail2ban/filter.d# ...
Matt Wood's user avatar
4 votes
2 answers
8k views

What are fail2ban's log iptables "returned NNN" entries? (Fail2ban is failing to ban)

In my fail2ban.log there are some entries the meaning of which I don't understand (and haven't found searching around)... I have several "jails", and I have created one particular one that bans IP's ...
luri's user avatar
  • 4,092
4 votes
1 answer
3k views

fail2ban actions to broaden the banned IP range

Is there a way to have fail2ban ban the entire class C network from which a ban address comes from? A
A.Adverse's user avatar
  • 195
3 votes
2 answers
9k views

Fail2ban 0.9.0 enabling jails

I updated my server to 16.04 and it only installs fail2ban 0.9.0. There is no option to enable jails and when I add it manually it fails to load. Any help much appreciated.
ILOVEKODI's user avatar
  • 602
3 votes
1 answer
1k views

Fail2Ban blocks my IP address due to blocked traffic, how do I stop it from banning me?

I need to know what program or what specific rule is banning my ip as it happens often when I am programming. It will ban my routers internal IP since I am connecting through the LAN. Then after ...
Riz-waan's user avatar
  • 133
3 votes
1 answer
3k views

How to prevent x11vnc attacks: attempts to unauthorized logins?

My computer was freezing for 1 second every 5 seconds. I found it was someone repeatedly trying to log in through x11vnc. Is there some way I can have it reject connections from an IP address for a ...
beauxq's user avatar
  • 211
3 votes
1 answer
1k views

Fail2ban misses some relay attempts

I have some relay attempts like these in my mail.log (they total 281 connection attempts in less than 3 minutes): May 16 04:58:30 MyServer postfix/smtpd[18950]: connect from unknown[xx.yy.zzz.www] ...
luri's user avatar
  • 4,092
3 votes
0 answers
11k views

How to solve ssh error "ssh_exchange_identification: read: Connection reset by peer" on ubuntu server correctly

Related very closely to question and answers like: How to fix "ssh_exchange_identification: read: Connection reset by peer" error? My reputation is too low to comment or provide answer ...
mhack's user avatar
  • 31
3 votes
0 answers
3k views

"top" shows fail2ban and sshd at the very top, hogging CPU usage

top shows fail2ban and sshd at the very top and hogging CPU usage. top - 19:30:57 up 1 day, 9:44, 1 user, load average: 41.03, 41.02, 41.02 Tasks: 738 total, 1 running, 737 sleeping, 0 stopped, ...
user14045797's user avatar
3 votes
0 answers
682 views

What do the filters included in Fail2ban?

In my /filter.d/ directory of Fail2ban there are many filters. 3proxy.conf asterisk.conf ejabberd-auth.conf lighttpd-auth.conf oracleims.conf selinux-...
alebal's user avatar
  • 463
3 votes
0 answers
1k views

fail2ban: how to immediately ban those who attempt ssh userid logins

My OpenSSH server is set up to only allow key based logins. I get many attacks each day from bots trying to login using a userid and password. I have fail2ban configured and running already. How can I ...
Organic Marble's user avatar
2 votes
2 answers
939 views

How do I permanently removing a ban stored by Fail2Ban

I have two filters that have banned local addresses. I have added the addresses to ignoreip but the damage was done already and the bans are in place. Every time I reboot my computer I have to do an ...
John Orion's user avatar
  • 2,791
2 votes
1 answer
3k views

How to set fail2ban with apf?

I just installed fail2ban and the apf firewall. Those 2 seems to be not working together. Fail2ban have added some iptable rules but they are not working. When I issue /etc/init.d/iptables status it ...
THpubs's user avatar
  • 2,785
2 votes
1 answer
6k views

Job for fail2ban.service failed because the control process exited with error

I have a basic issue on getting fail2ban started on one of my machines. I have a machine with Ubuntu 16.04 freshly installed today, and I am following a variety of instructions on fail2ban from source ...
ComputerScientist's user avatar
2 votes
1 answer
4k views

fail2ban broken after dist upgrade

My fail2ban install is broken after a dist update. I have no idea why it stopped to work. The logfile is over weeks 0 byte. Even if I can see in my server logs that the client should be blocked. Here ...
rekire's user avatar
  • 229
2 votes
1 answer
1k views

Fail2ban - IP banned is able to connect

I am using Ubuntu Server 20.04. I installed fail2ban and it is correctly banning the IP but still its able to connect. Giving below the fail2ban.log snippet. 2021-07-19 09:52:14,543 fail2ban.filter ...
Sriram Rayadurg's user avatar
2 votes
1 answer
1k views

fail2ban banned my IP but I still can SSH

Hi I am trying to use fail2ban to protect my server's SSH. I can see my ip is banned from: sudo fail2ban-client status sshd But I can still ssh in the machine through the same ip. Why the fail2ban ...
Coroner_Rex's user avatar
2 votes
1 answer
2k views

Configure Fail2Ban with bash script

I'm trying to configure the /etc/fail2ban/jail.local config with an bash script. I was thinking to use sed and regular expression to change the sections I need. sed -i "s/^bantime = 600/bantime = $...
user avatar
2 votes
1 answer
371 views

Fail2Ban bans, iptables lists the block but connection is still not blocked

I am using Ubuntu 22.04 LTS and I am trying to prevent repeated connection attempts to our mail server using fail2ban. Fail2ban creates a proper entry in the iptables configuration, but the related IP ...
Deckard's user avatar
  • 123
2 votes
1 answer
2k views

Fail2ban will not start

I installed Fail2ban but i can start the service. Every time i get this Error: systemctl status fail2ban × fail2ban.service - ...
LogiX's user avatar
  • 21
1 vote
1 answer
2k views

Fail2ban Dynamic IP

I need help setting up my Fail2ban. I have a client that your IP is Dynamic. and every time I need to wait for it to tell me the IP so I can include ignoreip. How can i make a script to collect if ...
Fernando's user avatar
1 vote
1 answer
2k views

how to update iptables-persistent?

After installing iptables-persistent I see: ubuntu@dur:~$ ubuntu@dur:~$ cat /etc/iptables/rules.v4 # Generated by iptables-save v1.6.0 on Wed Jan 11 14:36:17 2017 *filter :INPUT ACCEPT [251:16508] :...
Thufir's user avatar
  • 4,551
1 vote
1 answer
3k views

How can I get fail2ban to stop banning my Filezilla SFTP?

When I started with an Ubuntu home server, fail2ban was a lifesaver - alerting me to multiple attempts at unauthorized SSH access to my server. Recently, after moving to a way off port, the only ...
drkokandy's user avatar
  • 1,057
1 vote
3 answers
4k views

Unable to install fail2ban on Ubuntu 16.04 LTS server!

I installed a new Ubuntu 16.04 LTS server. I want to protect it with fail2ban, but when I try to install the package I get an error. How do I resolve this problem? > apt-get install fail2ban ...
snounez's user avatar
  • 21
1 vote
1 answer
3k views

Fail2ban not banning for my custom filter

I have created a new filter in fail2ban for my owncloud installation. When I tested it with fail2ban-regex it returned matches, so I figured it was working. When I turn it on in the jail however it ...
Villermen's user avatar
  • 153
1 vote
1 answer
7k views

fail2ban: Creating a custom action that gives parameters to script

I'm having a few problems to understand the workflow of fail2ban. My goal is the following action: name: pamysql used to: exec command with <name>, <failures>, <ip>, ... as ...
PKeidel's user avatar
  • 131
1 vote
2 answers
2k views

Fail2Ban/IPTables & Pure-Ftpd

I have pure-ftpd running on web server with Fail2Ban. Fail2Ban is letting apache2 connections in but are denying any FTP connection from anything but local host. I have attempted to modify the jail....
QuantumPhysGuy's user avatar
1 vote
1 answer
6k views

fail2ban is not sending mail when it bans an ip!

I have configured fail2ban to send me a mail when it bans an IP, but it is not working. I get a message when the jails start and stop but nothing else . I am using ssmtp to send mail via Google Mail. ...
isoman's user avatar
  • 669
1 vote
1 answer
92 views

Fail2ban ignoreip command crashing fail2ban

Recently I updated ubuntu 16.04 with the latest security updates and all of a sudden ignoreip stops fail2ban from running I comment this line out and it starts working Any ideas? i tried adding commas ...
Gary's user avatar
  • 31
1 vote
1 answer
2k views

Fail2Ban not banning

Fail2Ban works fine with the built-in jails, but my custom OpenVPN jail doesn't ban anything, neither does my NGINX-DoS jail. The output of sudo fail2ban-client status openvpn is: Status for the jail:...
user8292439's user avatar
  • 3,798
1 vote
0 answers
226 views

Fail2ban continuous log flood, what's happening?

A couple of days ago I noticed my server got very sluggish. When I investigated I noticed fail2ban was going crazy, the fail2ban-server process taking up 50% of CPU, and the fail2ban log file is ...
Pantalaimon's user avatar
1 vote
0 answers
1k views

ssh, fail2ban and max login attempts

I am testing fail2ban in a Ubuntu 18.04 LTS server in VirtualBox. I set maxretry = 3 in /etc/fail2ban/jail.local, and I tried to ssh connect from another virtual machine with a wrong password. After ...
Asarluhi's user avatar
  • 1,597
1 vote
0 answers
307 views

Block IP:s recognized by logwatch using fail2ban+ufw?

I got fail2ban and logwatch running on my server. Each day I have a few IP:s that's been probing my server and also a few "Attempts to use known hacks", as it states in the daily mail. I would like ...
Daniel Holm's user avatar
1 vote
0 answers
955 views

can't set up fail2ban Ubuntu 16.04

I run: sudo apt-get update sudo apt-get install fail2ban sudo cp /etc/fail2ban/jail.conf /etc/fail2ban/jail.local With out activating any jails or anything else: sudo systemctl restart fail2ban ...
newcat1000's user avatar
  • 1,442
1 vote
1 answer
124 views

fail2ban makes nc fail

I have a problem with fail2ban here. (Configs see below) Before I had it I used nc -4 -d -n -z -w 1 <SERVER IP> 22 from my PC in a script to check if the server is reachable on SSH (should ...
derHugo's user avatar
  • 3,336
1 vote
0 answers
773 views

Fail2ban Not banning IP Address

I am using this jail in /etc/fail2ban/jail.local: [nginx-bots] enabled = true port = http,https filter = nginx-bots logpath = /var/log/nginx/access.log* maxretry = 1 bantime = 172800 ...
JoaMika's user avatar
  • 135
1 vote
0 answers
803 views

Ubuntu Server 16.04 - Errors were encountered while processing fail2ban

When I try to install fail2ban on my Ubuntu Server 16.04 apt-get -install fail2ban I am getting error message: "Errors were encountered while processing fail2ban" I've tried unninstall fail2ban with ...
Dogomen's user avatar
  • 43