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
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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
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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,}
.? matches zero or one character, short for .{0,1}
.{7}
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My experience with servers, networks and gadgets.
