What are ports 137 and 138 used for?
Ports 137, 138, and 139 are used by NetBIOS, which does not support IPv6. CIFS is required for Windows file service. You can disable CIFS by issuing the cifs terminate command on your storage system console.
What is the use of port 445?
Port 445 is a traditional Microsoft networking port with tie-ins to the original NetBIOS service found in earlier versions of Windows OSes. Today, port 445 is used by Microsoft Directory Services for Active Directory (AD) and for the Server Message Block (SMB) protocol over TCP/IP.
What are common ports?
Some of the most commonly used ports, along with their associated networking protocol, are:
- Ports 20 and 21: File Transfer Protocol (FTP). …
- Port 22: Secure Shell (SSH). …
- Port 25: Simple Mail Transfer Protocol (SMTP). …
- Port 53: Domain Name System (DNS). …
- Port 80: Hypertext Transfer Protocol (HTTP).
What is port 139 commonly used for?
Port 139 is utilized by NetBIOS Session service. Enabling NetBIOS services provide access to shared resources like files and printers not only to your network computers but also to anyone across the internet.
Should I disable file and printer sharing?
Turning off file sharing will prevent wireless access to files on your computer over the network you’re connected to, thus making your computer more secure.
What are the advantages of file and printer sharing?
The advantages of printer sharing are:
- Fewer printers are needed, and less money is spent on printers and supplies.
- Reduced maintenance. There are fewer machines to maintain, and fewer people spending time fiddling with printers.
- Access to special printers.
What is the use of port 135?
Port 135 is used by Messenger Service (not MSN Messenger) and exploited in popup net send messenger spam [MSKB 330904]. To stop the popups you’d need to filter port 135 at the firewall level or stop the messenger service. The service uses all the following ports: 135/tcp, 135/udp, 137/udp 138/udp, 139/tcp, 445/tcp.
Should I open port 139?
If you are on Windows-based network that is running NetBios, it is perfectly normal to have port 139 open in order to facilitate that protocol. If you are not on a network using NetBios, there is no reason to have that port open. … E-mail servers need ports 25 and 110 for SMTP and POP, respectively.