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Knowledge base


  • Centos 8 update error: failed metadata repo appstream centos 8
  • Setting a password for apache (htaccess and htpasswd)
  • PTR records
  • Resetting root password in Centos 7 and Centos 6
  • Access to VDS server using VNC client
  • Protect your web server from malicious bots with Fail2Ban
  • Postfix mail routing - Domain : MX
  • Self-learning Spamassassin on the Spam folder
  • Configuring the ManageSieve email filter for Roundcube webmail
  • Deleting mailbox folders via PostfixAdmin
  • Setting up a DKIM digital signature in Postfix
  • Protecting your mail server from guessing passwords with Fail2Ban
  • Postfix mail server monitoring with PDF report
  • Installing YOUphpTube - your own video hosting platform on VPS
  • Nginx protection from flood attacks
  • Protecting Apache from Flood attacks
  • Setting up Fail2Ban to protect against password guessing
  • Setting up DDOS Deflate to protect against SYN attacks
  • Setting up iptables for connection limit
  • Setting up a crontab script to avoid high load