diff -up LibVNCServer-0.9.1/libvncclient/vncviewer.c~ LibVNCServer-0.9.1/libvncclient/vncviewer.c
--- LibVNCServer-0.9.1/libvncclient/vncviewer.c~	2007-02-01 17:05:56.000000000 +0200
+++ LibVNCServer-0.9.1/libvncclient/vncviewer.c	2009-05-20 22:26:35.000000000 +0300
@@ -316,6 +316,7 @@ void rfbClientCleanup(rfbClient* client)
 #endif
 #endif
 
+  if (client->sock > 0) close(client->sock);
   free(client->desktopName);
   free(client->serverHost);
   free(client);