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Knowledge base


  • Table of network correspondence to the number of IP addresses in blocks
  • Error 450 4.7.1 Client host rejected: cannot find your hostname
  • Reason for error 550 5.7.23 Recipient address rejected: Message rejected due to: domain owner discourages use of this host
  • Setting up nginx optimization to increase site speed
  • Configuring Russian language support in the Debian console
  • Creating and unpacking archives in Linux
  • Comparing 2 files in Linux console
  • Your own cloud office, installing OnlyOffice on VPS
  • Reason mysql connect error no such file or directory
  • Resetting the root password for the MariaDB server
  • Setting up remote access to the MariaDB database
  • Installing Ioncube for php on Debian 12
  • Setting up a time synchronization service on Debian 12
  • Setting up iptables firewall in Debian 12
  • Configuring DNS domain records for virtual servers
  • Installing KDE and setting up a VNC server on Linux Debian 12
  • Changing the port in the Linux SSH service
  • System Information (Hardware and OS) in Linux
  • How to find out whois server of a domain zone
  • Installing the latest Java and Tomcat 10 on Debian 12