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Linux Change password login method To log in safely with Key key to avoid password cracking by brute force

First make sure your system has openssl installed   openssl -V   # Under normal...
iptables block BT/PT/SPAM (spam) and custom port/keywords One-click script

System Requirements CentOS 6+ / Debian 6+ / Ubuntu 14.04 +   Recommend Debian 8 x64, this is...
Linux modify the default SSH port 22 to avoid brute force password cracking

To be safe, we first add an SSH port and add the corresponding firewall rules, and then try to...
Server security DenyHosts prevents SSH brute force cracking

wget http://soft.vpser.net/security/denyhosts/DenyHosts-2.6.tar.gz   tar zxvf...
Windows closes useless ports

netsh advfirewall firewall add rule name="block445 (TCP-In)" protocol=TCP dir=in localport=445...