Microsoft Windows Error Code 0x80070027: How to Fix It

Medium 10-20 minutes Medium Severity Verified June 2026
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Error Code
0x80070027
Brand
Microsoft Windows
Product Type
hresult
Severity
Medium
DIY Difficulty
Medium
Estimated Fix Time
10-20 minutes
Error 0x80070027 means your Windows system has run out of share buffers. This usually happens when too many network connections are open or a program holds onto file shares. Here's how you can fix it.
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Tools You'll Need

How to Fix Error Code 0x80070027

  1. Close network share connections

    This will disconnect you from any mapped drives. You may need to reconnect them later.

  2. Restart your computer

  3. Adjust share buffer settings (advanced)

    Incorrect registry changes can harm your system. Back up the registry first.

  4. Check for malware

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When to Call a Professional

If the error persists after these steps, you may have a corrupted system file or deeper network issue. Contact a Windows technician.

Frequently Asked Questions

What causes error 0x80070027?
It means the share buffer memory is full, often due to too many open network connections or a program not releasing shares.
Can I fix error 0x80070027 without restarting?
Disconnecting network shares (net use * /delete) may fix it temporarily, but a restart is recommended to fully clear buffers.
Is error 0x80070027 dangerous?
No, it's not a hardware failure. It typically indicates a network resource limit is reached and is safe to fix.
Will resetting Windows fix error 0x80070027?
It might, but try simpler fixes first. Resetting should be a last resort.
How do I increase share buffer size?
You can adjust the MaxMpxCt registry key under LanmanServer Parameters to increase the number of allowed connections.

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