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I have setup my system to share to be able file between a Mac Pro running Mac OS X 10.6.4 and a Windows machine running XP SP3 using SMB sharing. I am able to send files either way easily enough but as soon as I attempt to send files over the network simultaneously the network grinds to a halt and the transfers time out.

Any one have any ideas?

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Does it also happen with bi-directional transfers with other machines (if you can get your hands on some to test it)? Does it also happen when you boot e.g. from a Linux live DVD on your Windows system? What kind of network hardware do you use? –  Daniel Beck Dec 23 '10 at 16:15
This sounds like a Duplex issue with your network. Either your computers or router is half duplex, or there is a duplex mismatch. It's hard to diagnose this issue without getting a packet analysis. –  vcsjones Dec 23 '10 at 16:59

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