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.
80
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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 ...
48
votes
3
answers
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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 ...
39
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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 ...
17
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2
answers
3k
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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 ...
13
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3
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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?
10
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5
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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
...
7
votes
1
answer
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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 (...
7
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1
answer
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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 ...
6
votes
1
answer
6k
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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-...
6
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4
answers
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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 ...
5
votes
2
answers
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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 ...
5
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2
answers
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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 ...
5
votes
1
answer
1k
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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]
...
4
votes
2
answers
4k
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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# ...
4
votes
2
answers
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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 ...
4
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1
answer
3k
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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
3
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2
answers
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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.
3
votes
1
answer
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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 ...
3
votes
1
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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 ...
3
votes
1
answer
1k
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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]
...
3
votes
0
answers
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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 ...
3
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0
answers
3k
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"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, ...
3
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0
answers
682
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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-...
3
votes
0
answers
1k
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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 ...
2
votes
2
answers
939
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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 ...
2
votes
1
answer
3k
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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 ...
2
votes
1
answer
6k
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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 ...
2
votes
1
answer
4k
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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 ...
2
votes
1
answer
1k
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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 ...
2
votes
1
answer
1k
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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 ...
2
votes
1
answer
2k
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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 = $...
2
votes
1
answer
371
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Fail2Ban bans, iptables lists the block but connection is still not blocked
I am using Ubuntu 22.04 LTS and I am trying to prevent repeated connection attempts to our mail server using fail2ban. Fail2ban creates a proper entry in the iptables configuration, but the related IP ...
2
votes
1
answer
2k
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Fail2ban will not start
I installed Fail2ban but i can start the service. Every time i get this Error:
systemctl status fail2ban
× fail2ban.service - ...
1
vote
1
answer
2k
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Fail2ban Dynamic IP
I need help setting up my Fail2ban. I have a client that your IP is Dynamic.
and every time I need to wait for it to tell me the IP so I can include ignoreip.
How can i make a script to collect if ...
1
vote
1
answer
2k
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how to update iptables-persistent?
After installing iptables-persistent I see:
ubuntu@dur:~$
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]
:...
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 ...
1
vote
3
answers
4k
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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
...
1
vote
1
answer
3k
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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 ...
1
vote
1
answer
7k
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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 ...
1
vote
2
answers
2k
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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....
1
vote
1
answer
6k
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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.
...
1
vote
1
answer
92
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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 ...
1
vote
1
answer
2k
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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:...
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 ...
1
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0
answers
1k
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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 ...
1
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0
answers
307
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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 ...
1
vote
0
answers
955
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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
...
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 ...
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
...
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 ...