🎮 Common Scenario: Are you experiencing Error 8455 while launching or installing AutoCAD? The solutions below directly address the system interactions specific to this application.
Restart RPC Services: Press Win+R, type services.msc, press Enter
👇 See all 2 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 8455, and generates a detailed HTML repair report.
What is Error 8455?
Windows System Error Code 8455, known as ERROR_DS_DRA_RPC_CANCELLED, is a Active Directory error that occurs during Active Directory and directory services. The error indicates that: The replication remote procedure call was cancelled. When this error is encountered, the Windows operating system was unable to complete the requested operation within the directory services subsystem. The error code 8455 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_DS_DRA_RPC_CANCELLED 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 Active Directory and directory services is essential for effective troubleshooting.
Common Causes
- RPC service or its dependencies (DCOM, Endpoint Mapper) are stopped
- Firewall is blocking RPC ports (135 and dynamic range 49152-65535)
- Network connectivity issues between client and server
- Active Directory or DNS issues preventing server discovery
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
- Press Win+R, type services.msc, press Enter
- Find 'Remote Procedure Call (RPC)' — ensure it's Running and set to Automatic
- Also check 'RPC Endpoint Mapper' and 'DCOM Server Process Launcher'
- If stopped, right-click each → Start
- If they won't start, run: sc config RpcSs start=auto from Admin CMD
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 "*8455*" -or $_.Message -like "*ERROR_DS_DRA_RPC_CANCELLED*"} | Format-List💡 Open PowerShell as Administrator, paste the command above, and press Enter.
Prevention Tips
- Never disable the RPC service — many Windows features depend on it
- Monitor service health using: sc query RpcSs periodically
- Ensure DNS is properly configured for domain-joined computers