I am only listing the well-known TCP/IP Ports I have ever used personally. There are of course more ports. ftp-data         20    File Transfer [Default Data] ftp              21    File Transfer [Control] ssh            22   Secure Shell telnet           23    Telnet smtp             25    Simple Mail Transfer domain           53    Domain Name Server (DNS) bootps           67   Bootstrap Read more [...]

The classic SMTP error code consists of three digits (e.g. 220 mail.domain.tld SMTP ready.). The ESMTP status codes are additions to the classic code and consist of digits devided by dots (5.1.1 User unknown.). Many times you see both types of code combined (e.g. 550 5.1.1 User unknown). Find below a list of the most common codes: 2xx Request ok. Go ahead. 220 Mail service is running (ESMTP ready). 221 2.0.0 Closing connection (Mail received successfully, Goodbye). 250 2.0.0 Message accepted Read more [...]

Many times, I find it quite hard to install and configure an application properly. I am not talking about user apps like Office, but server apps like SQL. The manuals are often very detailed, but as every possible configuration is discussed, it is hard to find your way to quickly install things. Examples are often not there or not complete. In this blog, I will post my detailed configuration steps, along with screenshots, so I have my own "archive" and also as possible help for others. Happy Read more [...]