Remote Desktop Connection: Error Code 0x904 Extended Error Code 0x7 Full

This directly addresses ERROR_ARENA_TRASHED.

netsh winsock reset
netsh int ip reset
ipconfig /flushdns

Reboot the client after these commands.

Without a specific definition for these error codes in public documentation, and given their hexadecimal format, they could relate to a variety of issues, including but not limited to: This directly addresses ERROR_ARENA_TRASHED

Modern RDP clients attempt UDP transport for better performance. Error 0x904 often occurs when the UDP channel fails to establish, and the fallback to TCP has a corrupted negotiation sequence. Reboot the client after these commands

Try these solutions in order. Each step solves a specific subset of error code 0x904 scenarios. and given their hexadecimal format

If you control the network firewall: