SMTP reply codes

See rfc2821 for the basic specification of SMTP; see also rfc1123 for important additional information. See rfc1893 and rfc2034 for information about enhanced status codes. Check the RFC index for further mail-related RFCs. Reply codes in numerical order Code Meaning…

SSL Certificate

What is an SSL certificate? SSL stands for Secure Sockets Layer, a global standard security technology that enables encrypted communication between a web browser and a web server. It is utilized by millions1 of online businesses and individuals to decrease…

Goodbye to DDOS

Hello all Yesterday, my website faced a SYN flood attack, which is a proper pain in the backside and you know how much of a pain it is only after it happens to you. So, the kiddie hackers (hope I…

Plesk: Self-Signed SSL Certificate

A new self-signed SSL certificate will be created in the server certificate repository: # ls -la /usr/local/psa/admin/conf/httpsd.pem -r——– 1 root root 3089 Sep 23 12:50 /usr/local/psa/admin/conf/httpsd.pem The old one will be renamed as httpsd.pem.sav # ls -la /usr/local/psa/admin/conf/httpsd.pem.sav -r——– 1…

Apache Prefork versus Worker

Prefork: The prefork MPM uses multiple child processes with one thread each. Each process handles one connection at a time. On many systems, prefork is comparable in speed to worker, but uses more memory. Prefork’s threadless design has advantages over…

Remove Apps from Windows 10

Open PowerShell as administrator, Copy and paste one or more of the following commands into the PowerShell prompt, pressing Enter after each one to remove the apps you don’t want on your Windows 10 system: Uninstall 3D Builder: Get-AppxPackage *3dbuilder* | Remove-AppxPackage…