Error code 0x904 with extended error 0x7 occurs when a Remote Desktop (RDP) client fails to establish a session because the client cannot retrieve or validate the remote machine’s user or session information. This usually indicates a connection or authentication failure between the RDP client and the Remote Desktop Gateway, broker, or host.
Based on debugging hundreds of RDP sessions, here are the root causes for the 0x904 + 0x7 combo: Error code 0x904 with extended error 0x7 occurs
| Code | Value | Meaning |
|------|-------|---------|
| 0x904 | 2308 decimal | Connection reset by peer – 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. | Sometimes the
Combined interpretation:
The RDP client established a TCP connection, but during session negotiation or encryption handshake, the remote server’s network stack or RDP service sent a TCP RST (reset) packet, and the local client’s network buffer management entered an invalid state. Error code 0x904 with extended error 0x7 occurs
Sometimes the .rdp file contains corrupted settings. Create a minimal, clean file.
Key flags here: disableudptransport:i:1 and enablecredsspsupport:i:0 force legacy SSL authentication, bypassing modern RDP security enhancements that often trigger error 0x904.
UDP can cause arena corruption on unstable networks. Force RDP to use TCP only.