Ports for windows file sharing

Sharing a folder or file creates a Windows Firewall exception for File and Printer Sharing. The exception opens the ports listed in the following table.

"If the server has NBT enabled, it listens on UDP ports 137, 138, and on TCP ports 139, 445. If it has NBT disabled, it listens on TCP port 445 only."

Connection	Ports
TCP	139, 445
UDP	137, 138

The default scope is to allow access from any computer on the network, including computers on the Internet. Unless you block incoming connections on these ports using a hardware firewall, firewall server, or other Internet-sharing device, your computer will be vulnerable to attack from the Internet as long as your Internet connection is active.

Regards 
கார்த்திகேயன் 
Karthikeyan