If you frequently move your laptop between networks, as I do, you will notice that when your IP address changes, server processes get upset. Darwin (and thus MacOSX) includes a way of detecting and fixing this situation.
I've composed a hint and sample files and posted them on my website. The hint is specific to SambaX, but the explanation should help you do this for any server process.
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20020612020311996