How to unlock USB port blocked by antivirus software

Andrew Wafer
by Andrew Wafer
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  • An antivirus program protects your Windows 10 device, but it can include some very annoying functionalities such as blocking all USB devices.
  • There's an easy fix for this situation, no matter the antivirus you are using, so scroll down to the main article.
  • We've got a whole collection of articles related to USB issues that you can check out in the separate USB section.
  • For everything you'd like to know about antivirus software, see the Antivirus Hub.
How to unlock usb port

Using a third-party antivirus solution is more than recommended especially if you are an active Windows 10 user who is always trying new apps and downloading different stuff from the web.

Only with the right antivirus programs installed, you can successfully protect your data and your identity. Unfortunately, in most situations the built-in Windows Defender program might not be enough as a more specialized software platform will be better for you.

Anyway, while in most situations the antivirus program is there to protect your Windows 10 device, in others its functionality might become quite annoying.

Think of the following scenario: you want to use an external USB device, so as usual, you plug it in; but, strangely the USB device isn’t recognized by your Windows 10 system, or if it is you cannot access it.

Well, if that happens, the problem might be caused by your antivirus, which is blocking the external USB device.

So, if the antivirus is indeed blocking the USB device, follow the guidelines explained below and learn how to re-enable the USB access within the antivirus built-in settings.

I’ve tried to cover the steps that should be followed for the most popular antivirus programs that are currently available, though similar procedures can be applied on almost any other security software that’s not included in the following list.


How do I stop my antivirus blocking USB devices?

1. How to bypass blocked USB by Bitdefender bitdefender antivirus blocking usb

  1. Open Bitdefender.
  2. Go to Policies and choose Create new Policy menu – it’s located on the left side of the main Bitdefender Management Console.
  3. Double-click on Device Scanning.
  4. Now, from that window choose how to handle a new, or an existing, USB connection from your antivirus.

You can also add exclusions for a certain USB device, if you know that the data stored there can be trust. Here is what you need to do:

  1. Launch Bitdefender and choose Protection.
  2. From there click on View Features.
  3. Go to Settings and click on Exclusions.add exclusions bitdefender
  4. Similarly, you can add a Network exclusion and manage what to do with other devices that are connected with your Windows 10 device.

In other words, Bitdefender comes with great features that can be used for choosing how the USB devices are controlled by the antivirus each time a new USB connection is detected.


2. Kaspersky blocking USB connectionKaspersky antivirus blocking usb

  1. Open the Kaspersky user interface.
  2. From the left panel of the main window access Protection.
  3. Click on Device Control and select Settings.
  4. Again, click on Settings from the right of Enable Device Control field.
  5. From there you can choose what to enable or what to block.

Additionally, you can add certain exceptions following these settings: Open Settings, click on Additional, then on  Threats and exclusions, choose to Configure exclusion rules and Add.


3. Fix Avast blocking USB connectionavast antivirus blocking usb

  1. Insert the USB device on your computer.
  2. Run Avast on your computer.
  3. From the left panel of Avast click on Protection and then select Antivirus.
  4. Select Other scans and choose USB / DVD scan.
  5. Now tweak how the scan is performed and choose if the scan is required or not.
  6. Hopefully, now you can re-enable the USB device which was previously blocked by your antivirus program.

A dysfunctional USB-C connection can also generate errors. Read this guide for more info.


4. Removable Media Scan feature in Nortonnorton antivirus blocking usb connection

With Norton, if the Removable Media Scan feature is enabled, the antivirus program will automatically scan any external device that’s connected with your computer.

So, if you think that Norton is blocking the USB, you should first disable the already mentioned feature. You can do that from Settings, then Antivirus option.


5. Avira blocked autorun on USB hard driveavira antivirus blcked usb connection

  1. First of all, disconnect your USB device from your computer.
  2. Reboot your Windows 10 device.
  3. Re-connect your USB device with your PC.
  4. Avira will ask you what to do next – from the drop-down list click on the Allow option and enable the Always do this for this device function.
  5. Click OK and save your changes.

6. Windows Defender blocked my USB connectionWindows Defender blocked USB

  1. Connect your USB device.
  2. Launch Windows Defender on your computer.
  3. Under Scan options click on Custom.
  4. Then, select Scan Now.
  5. A list will be displayed where you can choose what to scan.
  6. You can perform a scan for the USB device in order to ensure that there is nothing to worry about.
  7. In the end, you should be able to use the USB Device once more.

So that’s how you can re-enable USB access when external USB devices are blocked by antivirus programs.

Remember that the easiest way in which you can access your external device is by temporarily turning off the antivirus protection. Then, you will be able to use your USB device.

Though, you should do that only if you know for sure that all the files from that device don’t represent a security threat.

As already outlined, if you’re using different antivirus software from the already covered ones, don’t panic as you can use similar steps for obtaining the same result.

However, if you cannot find the right settings within your antivirus tool, tell us and we will try to assist you as soon as possible.


FAQ: Learn more about blocked USB ports

  • Can Windows Defender block USB?

Yes, Windows Defender can do that to help prevent external threats. 

  • How do you unlock a USB port which is blocked by Kaspersky?

With Kaspersky, you have to enable or disable the devices that you want to be blocked by the antivirus software. You can find the option under the Protection menu.

  • What is USB lockdown?

A USB lockdown software or USB blocking software is a program that enables you to block the USB ports on your device for all untrusted external devices.

Editor’s Note: This post was originally published in 2017 and has been revamped and updated in 2020 for freshness, accuracy, and comprehensiveness.

  • Hello,

    “Autorun.inf can be exploited to allow a malicious program to run automatically without the user knowing since it is a loading point for legitimate programs.”. Me, being a teen, I was creating this type of files of any single USB’s of mine. Try to format your USB and disable Bitdefender while starting customizing your USB,

    Cheers,