What is Windows Error 15201 (ERROR_MCA_INVALID_VCP_VERSION)?

Error 15201 (ERROR_MCA_INVALID_VCP_VERSION) is a Windows Internet & WinHTTP error that occurs when the monitor's vcp version (0xdf) vcp code returned an invalid version value.. This guide provides step-by-step solutions to resolve this issue.

What causes Error 15201?

Proxy misconfigured. SSL/TLS handshake failure. Client certificate expired. WinHTTP response timeout

How do I fix Error 15201 (ERROR_MCA_INVALID_VCP_VERSION)?

Reset Internet Settings: Open Command Prompt as Administrator. Run: netsh winhttp reset proxy. Open Internet Options → Advanced → Reset. Restart your browser and applications

Fix ERROR_MCA_INVALID_VCP_VERSION — Windows Error Code 15201

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⚡ Quick Fix

Reset Internet Settings: Open Command Prompt as Administrator

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📑 Table of Contents

What is Error 15201? Common Causes Step-by-Step Solutions Prevention Tips Related Errors

💡 What is Error 15201?

Windows System Error Code 15201, known as ERROR_MCA_INVALID_VCP_VERSION, is a Internet & WinHTTP error that occurs during WinHTTP, WinInet, and internet protocols. The error indicates that: The monitor's VCP Version (0xDF) VCP code returned an invalid version value. When this error is encountered, the Windows operating system was unable to complete the requested operation within the internet services subsystem. The error code 15201 is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name ERROR_MCA_INVALID_VCP_VERSION maps directly to this numeric code and is commonly referenced in Microsoft documentation, developer forums, and system logs. Understanding this error and its context within WinHTTP, WinInet, and internet protocols is essential for effective troubleshooting.

⚠️ Common Causes

Proxy misconfigured
SSL/TLS handshake failure
Client certificate expired
WinHTTP response timeout

✅ Step-by-Step Solutions

1 Reset Internet Settings

Open Command Prompt as Administrator
Run: netsh winhttp reset proxy
Open Internet Options → Advanced → Reset
Restart your browser and applications

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💻 Diagnostic Command

Run this PowerShell command to find related events in your system log:

Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*15201*" -or $_.Message -like "*ERROR_MCA_INVALID_VCP_VERSION*"} | Format-List

💡 Open PowerShell as Administrator, paste the command above, and press Enter.

🛡️ Prevention Tips

Use centralized proxy management
Keep root certificates updated
Disable legacy SSL 3.0 protocol

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Last updated: 2026-03-13

📖

Based on Official Microsoft Documentation

Solutions Tested on Windows 10 & 11

Error codes sourced from Microsoft Win32 SDK. Updated 2026-03-13.