How to Fix Error 0x8007003B “An unexpected network error occurred”

Error 0x8007003b when trying to copy a large file (>100 MB) over a VPN connection, it may show if the connection to the server is not stable or if the settings do not match, e.g. B. if you are running Samba or an OpenVPN tunnel that limits the bandwidth to server.server

Some users have also reported that this happens on multiple operating systems, copying to a DFS or NAS, and changing network settings on both your device and router doesn’t help.

There are several things you can try to see if they fix the problem, so read on to see what you can do about it.

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User tip: Multiple settings

We came across it while searching for this solution this post on social.technet, where there are many interesting discussions about different configurations like OpenVPN, SMB, Samba, etc.

Method 1: Disable 3rd party/antivirus or firewall

Security programs on your PC often cause problems with new updates. Antivirus programs can “Good” and the “angry” the use of these applications, this way they can notify you so that you block or even delete them.

In most cases, you can turn off the antivirus by finding it in the right-hand corner of the taskbar. After finding your antivirus program icon, the right mouse button East. You should get a drop down menu and click deactivate. This will disable your antivirus while you work on installing new updates.

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If you don’t want to disable it and might not want to have this problem again in the future, it’s best to make an exception in your antivirus settings so that there are no problems in the future. . . In most cases you can make an exception by accessing the settings check your antivirus program exceptions, and add a rule. If you get stuck, visit the website of your specific antivirus and find a detailed guide on how to do the above two things.

Follow the steps below to disable the firewall.

  1. Open the Control Panel by going to the start menu and locate them all programs. navigate to Switchboard icon and click on it.
  2. In the Control Panel, click the security system symbol.
  3. Click on secure firewall window.
  4. If Windows Firewall is disabled, Windows Firewall status will be Disabled. If yes For sure, You should disable it.
  5. In the window, select Customize settings Disable Windows Firewall and click OK.

Method 2: Check the format

Windows and your storage have a few different formatting methods such as FAT32 or then NTFS. Both the methods have different limitations and some of them can cause this problem. What to check Formatting the target drive where to copy the file to. If yes FAT32You should know that it only supports files smaller larger than 4 GB and will be automatically blocked towards the end of the copy. This only happens with a single file larger than 4GB. So if there are a lot of smaller ones, you should be fine.

Although this seems like a much more complicated issue than it really is, just follow the methods above and you should be fine.

Method 3 – Enable guest access using Windows Powershell

If you change this value, the will be activated guest access on your Windows that may solve this problem error 0x8007003B, You need to edit the key with the registry editor but I created this command that does the same thing but you don’t need to worry about editing the registry.

Follow the steps below to enable guest access.

    1. Right-click the start button and press “Windows Powershell (Administrator)”
    2. set the following organized and press Enter.
      REG ADD HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters /f /v AllowInsecureGuestAuth /t REG_SZ /d 1
      execution of the command.
    3. Restart your computer and your problem should be decided.
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