Service Host: TCP/IP NetBIOS Helper [Process Explained]

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Written by: Stelian Pilici

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When you open the Task Manager on your Windows computer, you may notice a process called “Service Host: TCP/IP NetBIOS Helper” running in the background. This process, also known as “lmhosts.exe,” is an essential component of the Windows operating system. In this article, we will explore why this process is running, its functions, and how it impacts your computer’s performance.

Windows Task Manager

Understanding TCP/IP NetBIOS Helper

The TCP/IP NetBIOS Helper service is responsible for providing support for NetBIOS over TCP/IP (Transmission Control Protocol/Internet Protocol) protocols. NetBIOS, which stands for Network Basic Input/Output System, is an API (Application Programming Interface) used by applications to access network services.

The NetBIOS protocol was widely used in earlier versions of Windows for file and printer sharing, as well as for network communication between computers. However, with the introduction of newer networking technologies, such as TCP/IP, the importance of NetBIOS has diminished.

The TCP/IP NetBIOS Helper service acts as a mediator between applications that still rely on NetBIOS and the modern TCP/IP protocol stack. It enables these applications to communicate over a TCP/IP network by translating NetBIOS requests into TCP/IP requests and vice versa.

Why Is It Running?

Even though NetBIOS is no longer as prevalent as it once was, the TCP/IP NetBIOS Helper service continues to run in the background for backward compatibility reasons. Some older applications and network devices may still rely on NetBIOS for certain functionalities, and disabling the service could cause compatibility issues.

Additionally, the TCP/IP NetBIOS Helper service is required for certain network features, such as the “Network Neighborhood” or “Network Discovery” in Windows, which allow you to browse and access shared resources on your local network.

While the service may not be actively used by most users, it remains enabled by default to ensure compatibility and support for legacy applications and network functionalities.

Impact on Performance

The TCP/IP NetBIOS Helper service is a relatively lightweight process that consumes minimal system resources. It typically runs in the background without causing any noticeable impact on your computer’s performance.

However, in rare cases, the service may malfunction or become corrupted, leading to high CPU or memory usage. If you notice unusually high resource consumption by the TCP/IP NetBIOS Helper process, it is recommended to investigate further to ensure there are no underlying issues.

If you suspect that malware or a virus may be disguising itself as the TCP/IP NetBIOS Helper process, it is crucial to run a thorough scan using reliable security software. We recommend using Malwarebytes Free to scan your system for any potential threats.

Disabling or Stopping the Service

While it is generally not recommended to disable the TCP/IP NetBIOS Helper service, there may be situations where you want to stop it temporarily or permanently. Here are the steps to disable the service:

  1. Open the Run dialog by pressing the Windows key + R.
  2. Type “services.msc” and press Enter to open the Services window.
  3. Scroll down and locate the “TCP/IP NetBIOS Helper” service.
  4. Right-click on the service and select “Properties.”
  5. In the Properties window, change the “Startup type” to “Disabled.”
  6. Click “Apply” and then “OK” to save the changes.

It is important to note that disabling the TCP/IP NetBIOS Helper service may cause compatibility issues with certain applications or network functionalities. Therefore, it is recommended to proceed with caution and only disable the service if you are certain it will not impact your system’s performance or functionality.

Conclusion

The TCP/IP NetBIOS Helper service, also known as “lmhosts.exe,” is an integral part of the Windows operating system. It enables backward compatibility for applications and network devices that rely on the NetBIOS protocol. While it may not be actively used by most users, disabling the service can potentially cause compatibility issues. It is generally recommended to leave the service enabled unless you have a specific reason to disable it. If you suspect any issues with the TCP/IP NetBIOS Helper process, it is advisable to run a scan using reliable security software like Malwarebytes Free to ensure your system’s safety.

How to Stay Safe Online

Here are 10 basic security tips to help you avoid malware and protect your device:

  1. Use a good antivirus and keep it up-to-date.

    Shield Guide

    It's essential to use a good quality antivirus and keep it up-to-date to stay ahead of the latest cyber threats. We are huge fans of Malwarebytes Premium and use it on all of our devices, including Windows and Mac computers as well as our mobile devices. Malwarebytes sits beside your traditional antivirus, filling in any gaps in its defenses, and providing extra protection against sneakier security threats.

  2. Keep software and operating systems up-to-date.

    updates-guide

    Keep your operating system and apps up to date. Whenever an update is released for your device, download and install it right away. These updates often include security fixes, vulnerability patches, and other necessary maintenance.

  3. Be careful when installing programs and apps.

    install guide

    Pay close attention to installation screens and license agreements when installing software. Custom or advanced installation options will often disclose any third-party software that is also being installed. Take great care in every stage of the process and make sure you know what it is you're agreeing to before you click "Next."

  4. Install an ad blocker.

    Ad Blocker

    Use a browser-based content blocker, like AdGuard. Content blockers help stop malicious ads, Trojans, phishing, and other undesirable content that an antivirus product alone may not stop.

  5. Be careful what you download.

    Trojan Horse

    A top goal of cybercriminals is to trick you into downloading malware—programs or apps that carry malware or try to steal information. This malware can be disguised as an app: anything from a popular game to something that checks traffic or the weather.

  6. Be alert for people trying to trick you.

    warning sign

    Whether it's your email, phone, messenger, or other applications, always be alert and on guard for someone trying to trick you into clicking on links or replying to messages. Remember that it's easy to spoof phone numbers, so a familiar name or number doesn't make messages more trustworthy.

  7. Back up your data.

    backup sign

    Back up your data frequently and check that your backup data can be restored. You can do this manually on an external HDD/USB stick, or automatically using backup software. This is also the best way to counter ransomware. Never connect the backup drive to a computer if you suspect that the computer is infected with malware.

  8. Choose strong passwords.

    lock sign

    Use strong and unique passwords for each of your accounts. Avoid using personal information or easily guessable words in your passwords. Enable two-factor authentication (2FA) on your accounts whenever possible.

  9. Be careful where you click.

    cursor sign

    Be cautious when clicking on links or downloading attachments from unknown sources. These could potentially contain malware or phishing scams.

  10. Don't use pirated software.

    Shady Guide

    Avoid using Peer-to-Peer (P2P) file-sharing programs, keygens, cracks, and other pirated software that can often compromise your data, privacy, or both.

To avoid potential dangers on the internet, it's important to follow these 10 basic safety rules. By doing so, you can protect yourself from many of the unpleasant surprises that can arise when using the web.

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