How to disable NetBios over TCP/IP (2024)

FAQs

How to disable NetBios over TCP/IP? ›

Step 1: Open control panel Step 2: Navigate to programs and features. Step 3: Click on "Turn Windows features on or off. Step 4: Disable "NetBios over TCP/IP"Step 5 : Click ok.

Right-click Local Area Connection, and then click Properties. Select Internet Protocol Version 4 (TCP/IPv4), click Properties, and then click Advanced. Click the WINS tab, and in the NETBIOS setting section, click Disable NETBIOS over TCP/IP. Click OK to close the properties windows.

Client Compatibility: Disabling or changing the NetBIOS domain name can cause compatibility issues with older clients that rely on the NetBIOS name for authentication and resource access.

Click on Start > Run > cmd. this means NetBIOS is enabled. Confirm that it's been disabled by going to Start > Run > cmd > nbstat -n.

Step 1: Open the Control Panel Step 2: Click on Windows Firewall/ Windows Defender firewall Step 3: Navigate to advanced settings. Step 4:Right click on inbound rules and click on new rule. Step 6:Select port and press next Step 7:Specify the port 137 under specific local ports, select UDP and press next.

NetBIOS over TCP/IP is not required for standard Windows networking function. You'd only need it if you are using legacy applications that require that API to function. Disable it, if you must, and re-enable it if you have problems with your apps. It will not “hurt” to leave it enabled.

In the Active Directory Users and Computers configuration window, right-click your domain and choose the Properties menu item. Your domain's full DNS name is the first name listed in the General tab. Domain DNS names generally contain a period. Your domain's NetBIOS name is the pre-Windows 2000 entry in the same tab.

Both your Active Directory domain FQDN and NetBIOS can be confirmed using simple command prompt commands. Type nbtstat -n and it will display some information. Under Name will be several entries: the NetBIOS will be one of the Group type.

NetBIOS is legacy and you only need it if you are using old applications or old versions of Windows that require it or use WINS.

If NetBIOS is enabled and open to the outside, attackers may try to reach shared directories and files. This also gives sensitive information to the attacker such as the computer name, domain, or workgroup. Solution: The recommended solution is to block it in your firewall (or even your router, using ACLs).

What does enable NetBIOS over TCP IP mean? ›

NetBIOS over TCP/IP provides the NetBIOS programming interface over the TCP/IP protocol. It extends the reach of NetBIOS client and server programs to the wide area network (WAN). It also provides interoperability with various other operating systems.

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "MSS: (NoNameReleaseOnDemand) Allow the computer to ignore NetBIOS name release requests except from WINS servers" to "Enabled".

NetBIOS over TCP traditionally uses the following ports: NBName: 137/UDP. NBName: 137/TCP. NBDatagram: 138/UDP.

NetBIOS is an abbreviation of Network Basic Input/Output System. The primary purpose of NetBIOS is to allow applications on separate computers to communicate and establish sessions to access shared resources, such as files and printers, and to find each other over a local area network (LAN).

Ports 137 and 139 (NetBIOS over TCP) and 445 (SMB) are commonly associated with file sharing and network communication in Windows environments. However, they are also known to be vulnerable to several security threats: EternalBlue exploit.

Probably not. But as whopper noted, you may unknowingly have an application or service that relies on it. Even if you don't have an application that requires it, you'd have to make sure you disable it correctly/entirely, as network browse requests (\server\share, etc.) often leverage NetBIOS.