Error "Exception from HRESULT: 0x80040DFA" is displayed
Getting this error in an RDS session when starting Online Speech Recognition is caused by newer versions of Philips extensions, starting with 4.4.441.x. The featured auto detection algorithm seems to put too much data at once on the RDP protocol.
The current workaround is to apply attached registry tweak (remote override.reg) on the target machine (server). Please reboot target after applying.