PTI is the name of the router of this user. If you want to know what a router is, please read here:
http://en.wikipedia.org/wiki/Router

And if you want us to help you with your problem, then it would be nice if you could answer the following questions:

1. OS version? (eg: Windows 98)
2. What firewalls you have?
3. How much ram?
4. Hard Disk space available?
5. Connection type? (eg: dialup, broadband, cable, etc.)
6. Modem & router brand name & model numbers?
7. Where are you trying to connect from (home, school, work, etc.)?
8. What version of Limewire (LW) & Java do you have? (Go to LW's menu Help>About LW...) Will show both LW & Java version.
9. Who is your isp provider (Internet Service Provider)?
10. Are you sharing the connection with other computers or p2p sharing programs? If yes, please give details of set up.
11. Is this a your 1st try at LW or is this a new problem with an experienced user.

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"