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…