com.apple.launchd[1] (org.samba.winbindd3733) Exited with exit code: 1

A 10.5.8 server dropped all SMB connections and the Console log was filled with these errors:

Mar 29 12:36:37 ... com.apple.launchd[1] (org.samba.winbindd[98460]): Exited with exit code: 1
Mar 29 12:36:37 ... com.apple.launchd[1] (org.samba.winbindd): Throttling respawn: Will start in 10 seconds
Mar 29 12:36:47 ... com.apple.launchd[1] (org.samba.winbindd[98461]): Exited with exit code: 1
Mar 29 12:36:47 ... com.apple.launchd[1] (org.samba.winbindd): Throttling respawn: Will start in 10 seconds

Work-around (but not a full fix as it doesn't address the root cause)

Open Terminal and log in as sudo -s and type:

launchctl unload /System/Library/LaunchDaemons/org.samba.winbindd.plist

Then edit /System/Library/LaunchDaemons/org.samba.winbindd.plist
and the following:

This keeps the winbindd daemon from launching at startup, which it  isn't doing anyway, to re-enable it  change "true" to "false".