This means people are trying to brute-force your passwords (common on any public-facing server).
It shouldn’t cause any harm to clear out this file.
One way to reduce this is to change the port for SSH from 22 to something arbitrary. For some additional security, DenyHosts can block login attempts after a certain number of failures. I’d highly recommend installing and configuring it.
Related Posts:
- No acceptable C compiler found in $PATH while installing the C compiler
- Failed to start LSB :Bring Up down Networking
- HAProxy vs. Nginx
- Nginx 403 forbidden for all files
- rndc: connect failed: 127.0.0.1#953: connection refused
- HAProxy vs. Nginx
- How do you install Node.JS on CentOS?
- How do I update a CentOS server’s time from an authoritative time server?
- Best way to gracefully restart CentOS?
- Adding a directory to $PATH in CentOS?
- How to extend an ext4 partition and filesystem?
- Log all commands run by admins on production servers
- Centos 7 save iptables settings
- How to open port for a specific IP address with firewall-cmd on CentOS? [duplicate]
- ssh : Permission denied (publickey,gssapi-with-mic)
- CentOS vs. Ubuntu [closed]
- ImportError: No module named psycopg2
- No space left on device
- Error with pre-create check: “VBoxManage not found. Make sure VirtualBox is installed and VBoxManage is in the path”
- Error with pre-create check: “VBoxManage not found. Make sure VirtualBox is installed and VBoxManage is in the path”
- How to install “make” in ubuntu?
- javac : command not found
- VirtualBox: mount.vboxsf: mounting failed with the error: No such device
- CentOS error – sudo: effective uid is not 0, is sudo installed setuid root?
- Server can’t find NXDOMAIN
- SSL CA cert (path? access rights?)
- Python, how to handle the “ValueError: unsupported pickle protocol: 4” error?
- bash: mkvirtualenv: command not found
- phpinfo() is not working on my CentOS server
- Apache is downloading php files instead of displaying them
- Firewalld is not running [closed]
- httpd: Could not reliably determine the server’s fully qualified domain name, using 127.0.0.1 for ServerName
- When does `cron.daily` run?
- How can I read pcap files in a friendly format?
- How can I verify if TLS 1.2 is supported on a remote web server from the RHEL/CentOS shell?
- Mount CIFS Host is down
- how do you create an ssh key for another user?
- Allow SFTP but disallow SSH?
- InnoDB: Error: log file ./ib_logfile0 is of different size
- “POSSIBLE BREAK-IN ATTEMPT!” in /var/log/secure — what does this mean?
- How bad is it really to install Linux on one big partition?
- Show all users and their groups/vice versa
- For what is the “.well-known”-folder?
- How can I fully log all bash scripts actions?
- Where is my mysql log on OS X?
- Alternatives to Splunk?
- How should an IT department choose a standard Linux distribution?