Call your Isp and see if they are blocking you.

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System details - Help us help you > Provide these details when you post !

Fixes For Limewire When LW Isn't Operating As It Should
If you've updated LW and can't find your downloads!
LimeWire FAQ and User Guide--If LimeWire Will Not Load
If Limewire Will Not Connect

System Mechanic--FileHippo--Download.com

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Some time's i just want to throw my computer out the window