在 Boing Boing 看到 ISP 向使用者敲詐的新聞：Paying Canadian teclo an extra $50 makes IRC and ftp secure, somehow，事情的起因是這樣的：

Ports used by such ftp, telnet and IRC servers, among others, have been blocked. According to Telus, ‘These security measures are designed to reduce illicit traffic.’

換句話說有點像國內某些學校的搞法？*grin*

不過呢，你可以選擇被敲詐，這樣這些 port 就不會被 block 了：

But if home users upgrade to a business account (for $84.95 a month, rather than $29.95) the blocked ports magically become unstuck. There’s no mention, however, of increased security measures in the upgraded business accounts. Interpret this how you like.