⚠️ 2 verified solutions available for Error 15200 — Last updated 2026-03-25
Error 15200 📋

Fix ERROR_MCA_INVALID_CAPABILITIES_STRING — Windows Error Code 15200

Error 15200 (ERROR_MCA_INVALID_CAPABILITIES_STRING) is a Windows Internet & WinHTTP error that occurs when the monitor returned a ddc/ci capabilities string that did not comply with the access.bus 3.0 ddc/ci 1.1 or mccs 2 revision 1 specification.. This guide provides step-by-step solutions to resolve this issue.

🏷️ Code: 15200 📛 ERROR_MCA_INVALID_CAPABILITIES_STRING 📅 Updated: 2026-03-25 ⏱️ 2 Solutions
⚡ Quick Fix

Reset Internet Settings: Open Command Prompt as Administrator

👇 See all 2 solutions below
🐞 Auto-Fix Script for Error 15200
⚠️ How to use: Open PowerShell as Administrator, paste the code above, and press Enter.
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📑 Table of Contents
What is Error 15200? Common Causes Step-by-Step Solutions Prevention Tips Related Errors

💡 What is Error 15200?

Windows System Error Code 15200, known as ERROR_MCA_INVALID_CAPABILITIES_STRING, is a Internet & WinHTTP error that occurs during WinHTTP, WinInet, and internet protocols. The error indicates that: The monitor returned a DDC/CI capabilities string that did not comply with the ACCESS.bus 3.0 DDC/CI 1.1 or MCCS 2 Revision 1 specification. When this error is encountered, the Windows operating system was unable to complete the requested operation within the internet services subsystem. The error code 15200 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_CAPABILITIES_STRING 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

  • System resource conflict: The monitor returned a DDC/CI capabilities string that did not comply with the ACCESS.bus 3.0 DDC/CI 1.1 or MCCS 2 Revision 1 specification.
  • Proxy misconfigured
  • SSL/TLS handshake failure
  • Client certificate expired
📚 Comprehensive Guide

Troubleshooting COM and DCOM Architectural Failures (Event ID 10016)

A comprehensive guide on Component Object Model (COM), Distributed COM (DCOM), and how to safely interpret and resolve Event ID 10016 errors.

Read the full guide →

✅ Step-by-Step Solutions

1 Reset Internet Settings
  1. Open Command Prompt as Administrator
  2. Run: netsh winhttp reset proxy
  3. Open Internet Options → Advanced → Reset
  4. Restart your browser and applications
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Show Advanced Solutions (1 more)
2 Advanced Diagnostic for ERROR_MCA_INVALID_CAPABILITIES_STRING
  1. Open Windows Event Viewer (eventvwr.msc)
  2. Navigate to Windows Logs → System to find Event ID 15200
  3. Look for associated warnings that occurred immediately before the system crashed
  4. Right-click the entry and export the log file for further analysis

🎬 Video Tutorials

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How to fix Error 15200 (Mca Invalid Capabilities String)
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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 "*15200*" -or $_.Message -like "*ERROR_MCA_INVALID_CAPABILITIES_STRING*"} | 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: 2026-03-25
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Based on Official Microsoft Documentation
Solutions Tested on Windows 10 & 11
Error codes sourced from Microsoft Win32 SDK. Updated 2026-03-25.
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