Is 445 TCP Or UDP?


Since Windows 2000, SMB runs, by default, with a thin layer, similar to the Session Message packet of NBT’s Session Service, on top of TCP, using TCP port 445 rather than TCP port 139—a feature known as “direct host SMB”..

What is the port 443?

About Port 443 Port 443 is used explicitly for HTTPS services and hence is the standard port for HTTPS (encrypted) traffic. … Whenever you connect to a secure site, i.e., a site starting with HTTPS, you are getting connected to a web server over port 443. But HTTPS port 443 is also said to support HTTP sites.

What ports should be blocked?

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…•Oct 16, 2015

Does SNMP use UDP?

SNMP is a request/response protocol. UDP port 161 is its well-known port. SNMP uses UDP as its transport protocol because it has no need for the overhead of TCP. … The request and response messages that SNMP sends in the datagrams are called Protocol Data Units (PDU).

What service is port 445?

SMB is a network file sharing protocol that requires an open port on a computer or server to communicate with other systems. SMB ports are generally port numbers 139 and 445. Port 445: Used by newer versions of SMB (after Windows 2000) on top of a TCP stack, allowing SMB to communicate over the Internet.

Should I open port 445?

We also recommend blocking port 445 on internal firewalls to segment your network – this will prevent internal spreading of the ransomware. 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.

What uses SMB protocol?

The Server Message Block Protocol (SMB protocol) is a client-server communication protocol used for sharing access to files, printers, serial ports and other resources on a network. It can also carry transaction protocols for interprocess communication.


Table 26.1 NetBIOS Services. The session services in NetBIOS use TCP; TCP guarantees data delivery, whereas UDP does not.

Is port 445 TCP or UDP?

Along with ports 135, 137 and 139, port 445 is a traditional Microsoft networking port with tie-ins to the original NetBIOS service found in earlier versions of Windows OSes. Specifically, TCP port 445 runs server message block (SMB) over TCP/IP. This is a core means for communication on a Microsoft-based LAN.

Why is port 445 used?

NetBIOS is an older transport layer that allows Windows computers to talk to each other on the same network. Port 445: Later versions of SMB (after Windows 2000) began to use port 445 on top of a TCP stack. Using TCP allows SMB to work over the internet.

Is port 80 A TCP?

Port 80 is one of the most commonly used port numbers in the Transmission Control Protocol (TCP) suite. Any Web/HTTP client, such as a Web browser, uses port 80 to send and receive requested Web pages from a HTTP server.

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 SMB protocol 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.

Is port 135 TCP or UDP?

Certificate ServicesApplication protocolProtocolPortsRPCTCP135SMBTCP445, 139Randomly allocated high TCP ports¹TCPrandom port number between 1024 – 65535 random port number between 49152 – 65535²1 more row•Sep 8, 2020

What is the port 3389?

Port 3389 Details Port is IANA registered for Microsoft WBT Server, used for Windows Remote Desktop and Remote Assistance connections (RDP – Remote Desktop Protocol). Also used by Windows Terminal Server.