Mrxsmb (Event 8003) brings down the Network

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http://serverfault.com – There a domain with Windows SBS 2003 as the DC. At regular intervals, I am faced with the Mrxsmb (Event 8003) error which brings down the network. We have to other Windows SBS 2003 servers on the network, one of which was causing this. I have disabled the Computer Browser service on both of these. Now, the Windows XP and the Windows 7 clients in that Domain show up with this error in the DC's log at different times. Every single time, it brings down my network. Is there anything I am missing out here? As a temporary solution, I have manually "disabled" (because when it is stopped and the (HowTos)