Have the same problem. sometimes it works.....sometimes it don't? Maybe a bug in Lion?
Did you ever resolve this? It's started happening to me since I upgraded to 10.7.3.
Same problem getting to Lion hosts here, only work-around I've found is turning File Sharing off and on in System Preferences, then it works. Need to figure out how to do that programmatically to work around this. :-(
Still have this issue on 10.8.5. Toggling file sharing on/off does indeed fix the problem.
Thanks for the workaround!
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