What are UDP ports 137 and 138?

What are UDP ports 137 and 138?

Ports 137, 138, and 139 are used by NetBIOS, which does not support IPv6. CIFS is required for Windows file service. You can disable CIFS by issuing the cifs terminate command on your storage system console.

What is the protocol for port 137?

Service Name and Transport Protocol Port Number Registry

Service Name Port Number Transport Protocol
netbios-ns 137 udp
trim 1137 tcp
trim 1137 udp
us-gv 1370 tcp

What type of information can be collected by scanning port 137?

Port 137 (NETBIOS-NS)—One of many UDP ports for Windows services such as file and printer sharing. Port 123 (NTP)—Network Time Protocol.

What is NetBIOS UDP?

NetBIOS Name Service UDP NetBIOS name query packets are sent to this port, usually of Windows machines but also of any other system running Samba (SMB), to ask the receiving machine to disclose and return its current set of NetBIOS names. Related Ports: 138, 139, 445.

Should port 137 be blocked?

Port 137 is utilized by NetBIOS Name service. Enabling NetBIOS services provide access to shared resources like files and printers not only to your network computers but also to anyone across the internet. Therefore it is advisable to block port 137 in the Firewall.

Why is port 137 used?

How do I check if port 137 is open?

You could try telneting to port 139 from an outside machine. If you get anything other than an access denied, you likely have an open port. You could also try Shields Up; it checks ports 21, 23, 25, 79, 110, 113, 135, 139, 143, 443, 445, and 5000. Linkage: http://grc.com/default.htm (Look under “Hot Spots” section).

Which type of hacker represents highest risk to your network?

5. Which type of hacker represents the highest risk to your network?

  • Black-hat hackers.
  • Grey-hat hackers.
  • Script kiddies.
  • Disgruntled employees.

Should I block UDP ports?

To make it simple, you’re recommended to block udp ports 1024-65534 in your router/firewall. Since most internet applications work in tcp protocol, blocking of these udp ports will not influence your internet access. If one of your application needs to use udp, for example, application A needs to use UDP port “N”.

Is port 636 TCP or UDP?

Service Name and Transport Protocol Port Number Registry

Service Name Port Number Transport Protocol
ldap 389 udp
ldaps 636 tcp
ldaps 636 udp
www-ldap-gw 1760 tcp

What is port 137 used for?

Port(s) Protocol Service Details Source; 137 : tcp,udp: netbios-ns: NetBIOS is a protocol used for File and Print Sharing under all current versions of Windows.

What is the NetBIOS port 137?

Port (s) Protocol Service Details Source 137 tcp,udp netbios-ns NetBIOS is a protocol used for File and SG 137 tcp,udp NetBIOS NetBIOS Name Service (official) Wikipedia 137 tcp trojan Chode, Nimda Trojans 137 udp trojan Bugbear, Msinit, Opaserv, Qaz Trojans

How do I know if I’m not infected by UDP port 137?

Use our free Digital Footprint and Firewall Test to help verify you are not infected. Side note: UDP port 137 uses the Datagram Protocol, a communications protocol for the Internet network layer, transport layer, and session layer.

What is UDP 137 used for?

A principle rqmt for NetBIOS services on MS hosts (Win9x/ME/NT/Win2000). UDP 137 is used for browsing, logon sequence, pass-thru validations, printing support, trust support, WinNT Secure Channel, and WINS registration.Security Concerns: Key target in auth & DOS attacks.