Question: Should I Disable Port 445?

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..

Why is port 80 blocked?

The most commonly blocked ports are port 80 and port 25. Port 80 is the default port for http traffic. With blocked port 80 you will need to run your web server on a non-standard port. … ISPs block this port to reduce the amount of spam generated by worms on infected machines within their network.

How do I block port 139?

Step 4. Disable Port 139 on WindowsScroll down and double-click the Internet Protocol (TCP/IP).Click the Advanced button.Choose the WINS tab.Choose Disable NetBIOS over TCP/IP under the NetBIOS setting.Click OK.

What is the use of port 445?

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 of Windows (e.g. Windows 2K / XP). The SMB (Server Message Block) protocol is used among other things for file sharing in Windows NT/2K/XP.

Which ports should I block?

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…•

How do I block ports?

Click “Start | Control Panel | System and Security | Windows Firewall.”Select “Advanced Settings.” Click “Inbound Rules” to block an inbound port; click “Outbound Rules” to block an outbound port.Select “New Rule.” Choose “Port” from the options and then click “Next.”More items…

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 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?

Network resiliency and access to resources is a good thing, but keeping NetBIOS enabled for that reason, is not. There are many security concerns with NetBIOS; and disabling its support on your network and devices is strongly recommended. … It allows for message broadcasts to all computers on a network.

Why is port 139 open?

I did some research and found out it is a Netbios-ssn port used for sharing files. … 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.

Is SMB port 445 secure?

This means that SMB is running with NetBIOS over TCP/IP. 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.

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.

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.

How do I block incoming traffic on port 445?

How to Block Port 445 in Windows Firewall?Go Start > Control Panel > Windows Firewall and find Advanced settings on the left side.Click Inbound Rules > New rule. … Choose Block the connection > Next. … Check if you have created the rule by Properties > Protocols and Ports > Local Port.

Why is port 445 open?

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.