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Knowledge base


  • SSL renewal error - invalid response from .well-known/acme-challenge 404
  • Setting up a proxy for a repository in Linux
  • Running composer for different php versions
  • Bash script Christmas tree
  • Port forwarding using rinetd in Linux Debian 12
  • Installing golang (Go) on Debian 12
  • 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
  • Script for creating a sitemap file sitemap.xml
  • Website link analysis script
  • Configuring Russian language support in the Debian console
  • Password guessing protection for WordPress sites
  • Creating and unpacking archives in Linux
  • Comparing 2 files in Linux console
  • CPU load limits for shared hosting plans
  • 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