17 is, together with 5 and 23, a holy number for Discordians.
Port 17 TCP and UDP are well known ports used for the Quote of the Day protocol, as described in RFC 865.
There is no specific syntax for the quote. It is recommended that it be limited to the ASCII printing characters, space, carriage return, and line feed. The quote may be just one or up to several lines, but it should be less than 512 characters.