Fix An unexpected network error occurred 0x8007003B - TechCult

Fix An unexpected network error occurred 0x8007003B

Fix An unexpected network error occurred 0x8007003B: The error 0x8007003B occurs when you try to copy a large file (>1GB) from another computer or server over a network. The file transfer is suddenly abrupted and the next screen you see is an error popping out saying “An unexpected error is keeping you from copying the file. If you continue to receive this error, you can use the error code to search for help with this problem. Error 0x8007003B: An unexpected network error occurred.”

The cause of Windows Error 0x8007003b:

  • Virus or malware infection is a common cause of this error.
  • Conflicting Antivirus program or interference by Firewall.
  • Bad sectors in the Drive which you are tying to copy.
  • A recent software or hardware change to system may have interfered with the system
  • File system format of the drive may be set to FAT32.
  • Misconfigured network connection or server.

Fix An unexpected network error occurred 0x8007003B

There is no defined method to fix the error 0x8007003b because there can be any different combination of causes which are causing this error. So try all the below-listed method and there is no guarantee that if something works for other may also work for you because it depends upon PC to PC. Therefore, you may need to try out several methods before you will be able to finally “Fix An unexpected network error occurred 0x8007003B.”

Method 1: Check your computer for Virus or Malware

Perform a Full antivirus scan to make sure your computer is secure. In addition to this run CCleaner and Malwarebytes Anti-malware.


2.Run Malwarebytes and let it scan your system for harmful files.

3.If malware is found it will automatically remove them.

4.Now run CCleaner and in the “Cleaner” section, under the Windows tab, we suggest checking the following selections to be cleaned:

5.Once you’ve made certain the proper points are checked, simply click Run Cleaner, and let CCleaner run its course.

6.To clean your system further select the Registry tab and ensure the following are checked:

7.Select Scan for Issue and allow CCleaner to scan, then click Fix Selected Issues.

8.When CCleaner asks “Do you want backup changes to the registry?” select Yes.

9.Once your backup has completed, select Fix All Selected Issues.

10.Restart your PC.

Method 2: Disable Antivirus Program

Sometimes the Antivirus program can cause the error 0x8007003b in Windows and in order to verify this is not the case here you need to disable your antivirus for a limited time so that you can check if the error still appears when the antivirus is off.

1.Right-click on the Antivirus Program icon from the system tray and select Disable.

2.Next, select the time frame for which the Antivirus will remain disabled.

Note: Choose the smallest amount of time possible for example 15 minutes or 30 minutes.

3.Once done, again try to copy the file to the set destination and check if the error resolves or not.

Method 3: Disable Firewall

The main cause of the above error can sometimes be the Windows Firewall which can interfere with the file transfer. Let’s see how to disable firewall:

1.Press Windows Key + I then select Control Panel.

2.Next, click on System and Security.

3.Then click on Windows Firewall.

4.Now from the left window pane click on Turn Windows Firewall on or off.

5.Select Turn off Windows Firewall and restart your PC.

If the above method doesn’t work make sure to follow the exact same steps to turn on your Firewall again.

Method 4: Run File Check Utility (SFC) and Check Disk (CHKDSK)

1.Press Windows Key + X then click on Command Prompt(Admin).

2.Now type the following in the cmd and hit enter:

3.Wait for the above process to finish and once done restart your PC.

How To Fix File System Errors with Check Disk Utility(CHKDSK) .

5.Let the above process complete and again reboot your PC to save changes.

Method 5: Perform System Restore

run system restore in order to Fix An unexpected network error occurred 0x8007003B.

Method 6: Make sure the drive is in NTFS

Whenever copying a big file to a Drive/Flash drive make sure it’s formatted with NTFS (New Technology File System) format because if it’s formatted with FAT32(File Allocation Table) then you will definitely face the error 0x8007003B. This happens because FAT32 stores data in chunks of 32 bits while NTFS stores data pretty much as the same way as it was before: as a collection of attributes.

That’s it you have successfully Fix An unexpected network error occurred 0x8007003B but if you still have any queries regarding this post feel free to ask them in the comment’s section.