If you are mapping Linux directories in windows client.Then check your log file smbd.log.If you have receiving follwing error.
"getpeername failed. Error was Transport endpoint is not connected"
Check this link for solution.
http://lists.samba.org/archive/samba/2004-April/084048.html
Stop 1 : Stop windows browser service from your all windows clients
netstat -tvlnp | grep smbd - shows your samba service running ports in your linux system.
Stop 2 : iptables -I INPUT 1 -p tcp --dport 445 -j DROP - Run it on linux system
Stop 3 : Check using nmap - It shows you 445 as a filtered port.
Above steps may solve your problem.
