**I'm an expert in computer networking with over 10 years of experience in the field.** I have extensive knowledge of network protocols, including TCP/IP, and I'm familiar with a wide range of networking devices and technologies.

Port 445 is the well-known port for Microsoft-DS, which is used for Server Message Block (SMB). SMB is a network file sharing protocol that allows computers to share files and printers over a network. It is commonly used in Windows networks, but it can also be used on other operating systems.

Port 445 is used by SMB to establish a connection between a client and a server. Once a connection is established, the client can send commands to the server to request files or services. The server can then respond to the client's requests by sending the requested files or services.

Port 445 is a high-risk port because it is often targeted by attackers. Attackers can use port 445 to gain unauthorized access to a computer or network. They can do this by exploiting vulnerabilities in the SMB protocol or by using malicious software to attack computers that are listening on port 445.

To protect against attacks on port 445, it is important to keep your operating system and software up to date. You should also disable SMB if you do not need to use it. If you must use SMB, you should use a strong password and configure your firewall to block access to port 445 from unauthorized users.

Here are some additional details about port 445:

* It is a TCP port.
* It is used by SMB.
* It is a high-risk port.
* You can protect against attacks on port 445 by keeping your operating system and software up to date, disabling SMB if you do not need to use it, and configuring your firewall to block access to port 445 from unauthorized users.

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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.read more >>