0x80004005 (Unspecified error) when accessing network share in Windows 7

Question

I'm getting error 0x80004005 when trying to access a network share in Windows 7. The network share was created from a Windows 7 computer and is being accessed by a Windows 7 computer. The same exact configuration worked properly a month ago and for whatever reason doesn't work anymore.

I've tried

• Creating HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\LocalAccountTokenFilterPolicy and setting the value to 1
• Removing all 6to4 adapters in Device Manager
• Disabling IPv6 and setting IPv4 to a static address on the same subnet mask as the other computer
• Verifying the two computers are on the same workgroup
• Disabling the firewall and antivirus
• Updating Windows
• Accessing the share using \\[IP_ADDRESS]\[SHARE] and \\[HOSTNAME]\[SHARE]
• On the host computer (server) checking \\localhost for the share - the share does appear and I can access files
• Enabling NetBIOS over TCP/IP

How can I access this network share? Any help would be appreciated!

Answer 1

I recently resolved this issue by enabling the following group policy permission:

Local Computer Policy>Computer Configuration>Administrative Templates>Network>Lanman Workstation>Enable insecure guest logons

Answer 2

Fixed by installing KB4487345.

Answer 3

I had this problem in Windows 10, trying to access an open share (without username).

To fix it, you need to enable "AllowInsecureGuestAuth" in the registry under
"HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters".

You can check what it is on your system with

reg query HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters /v AllowInsecureGuestAuth

And you can set it to enable "AllowInsecureGuestAuth" with

reg add HKLM\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters /v AllowInsecureGuestAuth /t REG_DWORD /d 1

You need to do that in a Command Prompt or Powershell started as Admin (or "Run as Administrator")