What are ports 139 and 445 used for?
Port 139 is used by SMB dialects that communicate over NetBIOS. It’s a transport layer protocol designed to use in Windows operating systems over a network. Port 445 is used by newer versions of SMB (after Windows 2000) on top of a TCP stack, allowing SMB to communicate over the Internet.
What port is 445 used for?
Server Message Block (SMB)
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 is port No 139 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. Therefore it is advisable to block port 139 in the Firewall.
Is port 445 enough for SMB?
SMB has always been a network file sharing protocol. As such, SMB requires network ports on a computer or server to enable communication to other systems. SMB uses either IP port 139 or 445.
Should I block port 445?
Blocking TCP 445 will prevent file and printer sharing and also other services such as DHCP (dynamic host configuration protocol) which is frequently used for automatically obtaining an IP address from the DHCP servers used by many corporations and ISPs(Internet Service Providers) will stop functioning.
Is port 139 required for SMB?
As such, SMB requires network ports on a computer or server to enable communication to other systems. SMB uses either IP port 139 or 445.
Is port 445 insecure?
Malicious hackers admit, that Port 445 is vulnerable and has many insecurities. One chilling example of Port 445 misuse is the relatively silent appearance of NetBIOS worms.
What is port 445 used for and what is its a security risk and why?
Port 445 is associated with SMB (Service Message Block), an application layer network protocol that is mostly used for file sharing, printer sharing, and serial port sharing. Port 445 is vulnerable to security assaults, according to security researchers, and should be deactivated.
How do I open port 445?
Go to Computer Configuration > Policies > Windows Settings > Security Settings > Windows Firewall with Advanced Security > Windows Firewall with Advanced Security – LDAP > Inbound Rules. Right-click and choose New Rule. Choose Port and click Next. Choose TCP and at specific local ports enter 135, 445, then click Next.
Is port 139 needed for SMB?