Question: Is SMB Port 445 Secure?

What port does SMB use?

139SMB 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..

Is port 445 open by default?

If the server has NBT enabled, it listens on UDP ports 137 and 138, and TCP ports 139 and 445. If it has NBT disabled, it listens on TCP port 445 only. All four ports are open as default in all versions of Windows, including Windows 10 and Windows Server 2019.

What is port 3389 commonly used for?

By default, the server listens on TCP port 3389 and UDP port 3389. Microsoft currently refers to their official RDP client software as Remote Desktop Connection, formerly “Terminal Services Client”. The protocol is an extension of the ITU-T T. 128 application sharing protocol.

What ports should I block on my router?

For example, the SANS Institute recommends blocking outbound traffic that uses the following ports:MS RPC – TCP & UDP port 135.NetBIOS/IP – TCP & UDP ports 137-139.SMB/IP – TCP port 445.Trivial File Transfer Protocol (TFTP) – UDP port 69.Syslog – UDP port 514.More items…•

Should you disable NetBIOS?

Disabling the use and support of NetBIOS can help to mitigate an attacker’s ability to: poison and spoof responses, obtain a user’s hashed credentials, inspect web traffic, etc. It’s important to point out that NetBIOS itself is an API, not a networking protocol.

How do I unblock port 445?

These ports must be open for AD integration: TCP 88, TCP 445, UDP 88, and UDP 389.To open a port, navigate to Start > Control Panel > System and Security.Click Check firewall status. … Click Advanced settings. … Click Inbound Rules.Click New Rule. … Click Port.Click Next. … Click TCP or UDP depending on the desired port.More items…

Is SMB secure?

An information worker’s sensitive data is moved by using the SMB protocol. SMB Encryption offers an end-to-end privacy and integrity assurance between the file server and the client, regardless of the networks traversed, such as wide area network (WAN) connections that are maintained by non-Microsoft providers.

What happens if I block port 445?

Note that blocking TCP 445 will prevent file and printer sharing – if this is required for business, you may need to leave the port open on some internal firewalls. … You may also want to block sensitive data with the host-based firewall like iptables.

Can I close port 445?

Port 445 and Port 139 In Windows 2000, Microsoft has created a new transport for SMB over TCP and UDP on port 445, which replaces the older implementation that was over ports 137, 138, 139. … If you close port 445, you will not be able to copy any file system data to or from the path where port 445 is closed.

Why is port 445 used?

TCP port 445 is used for direct TCP/IP MS Networking access without the need for a NetBIOS layer. This service is only implemented in the more recent verions Windows starting with Windows 2000 and Windows XP. The SMB (Server Message Block) protocol is used among other things for file sharing in Windows NT/2K/XP.

What is port 139 commonly used for?

The port 139 is used for File and Printer Sharing but happens to be the single most dangerous Port on the Internet. This is so because it leaves the hard disk of a user exposed to hackers.

Is port 445 secure?

Avoid exposing SMB ports: Ports 135-139 and 445 are not safe to publicly expose and have not been for a decade. Patch everything: Keep your systems up-to-date to avoid exploits of known vulnerabilities.