Windows 7 N Ultimate x 64 - Windows backup error 0x81000039
Hi there, I have recently set up a wireless external drive on my wireless network. All of the other computers connected to the drive wirelessly through the network don't seem to have a problem backing up (they are running on Mac OS). Everytime I run Windows 7 backup to my drive on the wireless network it gets to 25% during the "copying files to ...." stage and then I get the following error message: Windows backup did not complete successfully. Check your backup. Windows Backup encountered an error when accessing the remote shared folder. Details: The specified network name is no longer available. Error code: 0x81000039. I have already tried a suggested fix to change the NTLM authentication level: 1. Click Start. Enter “gpedit.msc” in the Start Search box. 2. Locate to Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\ 3. In the right pane, double-click on “Network security: LAN Manager authentication level”. 4. Change the level to “Send LM & NTLM - use NTLMv2 session security if negotiated”. However this did not work. Also, none of the other computers are backing up while I'm trying to. Please help. Des
May 6th, 2010 3:26pm

Hi, I would like to suggest you update the network card driver for Windows 7, then disable antivirus program and firewall temporarily and test the issue in Clean Boot. What is the result in Clean Boot? Regards,Arthur Li - MSFT
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May 7th, 2010 10:12am

Hi Technocrate, Thanks for responding. I have already tried this and I still have the same problem. Des
May 7th, 2010 5:36pm

Hi Arthur Li, Thanks for responding. I have the latest network card driver updates. I tried the backup in clean boot and I still get the same error. *Tearing my hear out* :) Des
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May 7th, 2010 5:38pm

I can successfully backup to a drive connected by usb. I can read and write both ways to the wireless network drive so the backup should work fine but it doesn't. I have trolled many forums about this and it seems to be a real problem. I have also had a look at file sharing through the windows 7 support site and changing the settings didn't work either.
May 7th, 2010 6:50pm

Hi, Do you have another wireless network device or wired network device can be used to test the issue. If it works fine with both USB and wired network hard drive, the cause can be the wireless network device. Regards,Arthur Li - MSFT
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May 10th, 2010 11:10am

I have this same problem. Why do you keep marking the problem as solved when your suggestion doesn't work?
July 4th, 2010 1:42am

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