I have raised this issue with FreeRDP team too.
WebConnect Client - Latest Chrome on Win 7 x86 FreeRDP Server - Win7 x86
WebConnect easily establishes connection with MS RDP, but fails with FreeRDP server. Seems like, request packet sent by WebConnect is not valid to FreeRDP Server.
For Wireshark details, kindly look here:: https://github.com/FreeRDP/FreeRDP/issues/3858
