Routers blocking the proper ports on either network?

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"CR" <CR@discussions.microsoft.com> wrote in message
news:9B41D19D-DC53-417B-9264-842F5980525F@microsoft.com...
>I sent an invitation to a windows xp pc. and it did not work. I turned off
> the firewall. And so did the xp pc. Any one have any suggertions.