Most important TCP / UDP ports

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 [...]

E-Mail (SMTP) error codes

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 [...]

RegEx for BES Proxy URL Setting

Have you ever wondered what the default pattern matching string for the proxy URL settings in BES means? .*://.*(:\d*)?(/.*)*(\?.*)? Well, this is Java RegEx (Regular Expression) language. Find below some examples that help understand the RegEx: .       matches exactly one character .*      matches any number of characters (including 0), short for .{0,} .+      matches one or more characters, short for .{1,} Read more [...]