What ports need to be open for SMB? (2024)

What ports need to be open for SMB?

SMB ports (especially 445) are needed for file sharing (even between Windows and Linux, with the so-called Samba shares).

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Which ports need to be open 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.

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Is port 445 enough for SMB?

Yes, modern SMB (especially v2/v3) runs only on TCP port 445. However, Windows clients may also expect the server to be pingable, i.e. respond to ICMP Echo, before they even attempt a SMB connection.

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What port is SMB share?

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.

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What ports should always be open?

Which Ports Are Usually Open By Default?
  • 20 – FTP (File Transfer Protocol)
  • 22 – Secure Shell (SSH)
  • 25 – Simple Mail Transfer Protocol (SMTP)
  • 53 – Domain Name System (DNS)
  • 80 – Hypertext Transfer Protocol (HTTP)
  • 110 – Post Office Protocol (POP3)
  • 143 – Internet Message Access Protocol (IMAP)
  • 443 – HTTP Secure (HTTPS)
Oct 21, 2019

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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.

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What is 445 port used for?

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.

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How do I know if SMB port 445 is open?

If we want to check the ports 137,138,139 and 445 whether they are open we can use netstat command. This list open ports with TCP and UDP protocols. As we can see from the example the TCP 445 is open and listening mode which means this system will accept connections to the 445 port.

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How do I test my SMB port?

To identify ports and network interfaces your Samba domain member is listening on, run: # netstat -tulpn | egrep "smbd|nmbd|winbind" tcp 0 0 127.0.

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Should port 445 be blocked?

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.

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How do I enable SMB 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.

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Does SMB use TCP or UDP?

SMB relies on the TCP and IP protocols for transport. This combination potentially allows file sharing over complex, interconnected networks, including the public Internet. The SMB server component uses TCP port 445.

What ports need to be open for SMB? (2024)

What ports do SMB and CIFS use?

CIFS protocols and firewall ports
PortProtocolPurpose
445TCP, UDPSMB, CIFS, SMB2, DFSN, LSARPC, NbtSS, NetLogonR, SamR, SrvSvc
464TCP, UDPKerberos change or set a password
3268TCPLDAP GC
4379TCPCTDB in CIFS
3 more rows

Which ports should be blocked?

Which Ports Should You Block On Your Firewall?
ServicePort TypePort Number
NetBIOS/IPTCP, UDP137-139
SMB/IPTCP445
Trivial File Transfer Protocol (TFTP)UDP69
SyslogUDP514
3 more rows
Oct 25, 2021

Is port 443 always open?

Is port 443 suppose to be open by default in windows 8.1 pro? The answer is no.. To open a port, a process/application should be installed and configured to listen to port 443.. Typically if you are using a web server with https/teamviewer/skype there is possibility to see 443 port is opened..

What ports should always be closed?

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.
Oct 16, 2015

Is SMB port 139 TCP or UDP?

The earlier version of SMB (SMB 1.0) was originally designed to operate on NetBIOS over TCP/IP (NBT), which uses port TCP 139 for session services, port TCP/UDP 137 for name services, and port UDP 138 for datagram services.

Does SMB require UDP?

Windows supports file and printer-sharing traffic by using the SMB protocol directly hosted on TCP. SMB 1.0 and older CIFS traffic supported the NetBIOS over TCP (NBT) protocol supported the UDP transport, but starting in Windows Vista and Windows Server 2008 with SMB 2.0. 2, requires TCP/IP over port 445.

What is 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.

Should I block port 443?

You should not block outgoing traffic to TCP:443, but only incoming.

Should port 21 be closed?

The protocol contains well-known design flaws that can be used by attackers. This port should be blocked. Port 21 – Used by FTP to allow file transfers. Most hosts on your network are not intended to be FTP Servers - don't leave doors open that don't need to be open.

Should I open port 22?

Aspera recommends opening TCP/33001 and disabling TCP/22 to prevent security breaches of your SSH server. To enable TCP/33001 while your organization is migrating from TCP/22, open Port 33001 within your sshd_config file (where SSHD is listening on both ports).

What is port 8080 typically used for?

Port number 8080 is usually used for web servers. When a port number is added to the end of the domain name, it drives traffic to the web server. However, users can not reserve port 8080 for secondary web servers.

Is port 8080 secure?

Is port 8080 a secure port? Ans: We can't tell whether the port is secure or not just by looking at it. As a result, either port 80 or 8080 is insecure by default. To secure the port, we must add an SSL certificate.

What are ports 80 and 443 used for?

Port-443 allows data transmission over a secured network, while Port 80 enables data transmission in plain text. Users will get an insecure warning if he tries to access a non-HTTPS web page. Port 443 encrypts network data packets before data transmission takes place.

References

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