🎮 Common Scenario: Are you experiencing Error HTTP-405-IIS while launching or installing Valorant? The solutions below directly address the system interactions specific to this application.
Take Ownership of the Resource: Open Command Prompt as Administrator
👇 See all 3 solutions belowThe Ultimate Auto-Fix Script
Download our advanced, custom-built Smart Diagnostic Script (.bat). It safely creates a System Restore Point, applies targeted fixes based on advanced diagnostics for Error HTTP-405-IIS, and generates a detailed HTML repair report.
What is Error HTTP-405-IIS?
Windows System Error Code HTTP-405-IIS, known as HTTP_METHOD_NOT_ALLOWED_IIS, is a General System error that occurs during core Windows operations. The error indicates that: HTTP 405 Error on IIS: The request method is known by the server but is not supported by the target resource. This guide covers IIS-specific troubleshooting steps. When this error is encountered, the Windows operating system was unable to complete the requested operation within the system services subsystem. The error code HTTP-405-IIS is returned by the GetLastError() function and provides developers with a specific identifier to diagnose the root cause of the failure. The symbolic name HTTP_METHOD_NOT_ALLOWED_IIS 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 core Windows operations is essential for effective troubleshooting.
Common Causes
- Your user account lacks NTFS permissions on the target file or folder
- User Account Control (UAC) is blocking the operation
- The file is owned by SYSTEM or TrustedInstaller and requires ownership transfer
- Group Policy or antivirus software is restricting access
Fixing Permission Denied (0x80070005) and Access Violation Errors
An encyclopedia on Windows NT File System (NTFS) permissions, taking ownership via command line, and surviving 0x80070005 Access Denied errors.
Read the full guide →Step-by-Step Solutions
- Open Command Prompt as Administrator
- Run: takeown /f "C:\path\to\file" /r /d y
- Then run: icacls "C:\path\to\file" /grant %username%:F /t
- Replace the path with the actual file or folder causing Error HTTP-405-IIS (HTTP_METHOD_NOT_ALLOWED_IIS)
- Retry the operation that triggered Error HTTP-405-IIS (HTTP_METHOD_NOT_ALLOWED_IIS)
Video Tutorials
Diagnostic Command
Run this PowerShell command to find related events in your system log:
Get-EventLog -LogName System -Newest 20 | Where-Object {$_.Message -like "*HTTP-405-IIS*" -or $_.Message -like "*HTTP_METHOD_NOT_ALLOWED_IIS*"} | Format-List💡 Open PowerShell as Administrator, paste the command above, and press Enter.
Prevention Tips
- Avoid modifying files in C:\Windows\System32 unless absolutely necessary
- Use 'Run as Administrator' when performing system-level operations
- Keep a backup admin account in case your primary account gets locked