Remote Desktop or Remote Desktop (WebSocket) ports being blocked by Windows Defender or third-party antivirus. 🛠️ Recommended Troubleshooting Steps 1. Basic Connectivity Check Ping Test: Check connectivity by pinging the remote IP address. IP vs. Hostname: Try connecting using the IP address instead of the computer name to rule out DNS issues. Port Check: Use PowerShell to confirm port 3389 is open: Test-NetConnection [Remote_IP] -Port 3389 www.remoteaccesspcdesktop.com 2. Reset RDP Certificates (Common Server-Side Fix) Expired certificates are a frequent cause for error 0x904. www.remoteaccesspcdesktop.com machine, run certlm.msc Navigate to Remote Desktop > Certificates Delete any expired certificates
| Code | Value | Meaning | |------|-------|---------| | 0x904 | 2308 decimal | – The remote host abruptly closed the TCP connection. | | 0x7 | 7 decimal | ERROR_ARENA_TRASHED – The memory heap/arena used for network buffers was corrupted or freed unexpectedly. | Title: Resolving Remote Desktop Connection Error Code 0x904
: On the remote machine (especially Azure VMs), the self-signed RDP certificate might be expired or corrupt, causing the host to reject the connection instantly. Windows 11 "Bug" : Many users found that the standard RDP client ( Connection reset by peer | Code | Value
Less common but diagnostically important, some firewalls or Network Address Translation (NAT) devices use aggressive timeouts for idle or "half-open" connections. If the RDP handshake takes too long—due to network latency or slow disk I/O on the server—the firewall may inject a TCP Reset packet (RST). This reset manifests as extended error 0x7, and the server’s incomplete license negotiation logs as 0x904. Title: Resolving Remote Desktop Connection Error Code 0x904