FreeRapid Error

I'm using this program since last month and i love it. But two days ago it started having this problem: it downloads the links i line up but all of a sudden it says "ERROR- Unknown Host Error- Connection Problem?" although my internet works just fine (i can still surf on ie and chat on msn etc.) it does not start downloading again until i unplug my modem and restart my internet. how can i solve this problem?

Firewall settings probably.

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but i can download let's say 4 files and then it gives me the error message all of a sudden. i use windows vista. how can i check firewall settings and what am i looking for exactly?

The firewall probably stops it or something else is blocking the connection.
i don't know what software you are using as firewall. I don't say the problem with the firewall, but it's the most probable reason.

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