Edit: My apologize ! I just add port 9898 in Syno Firewall and it work directly !!!! I got the same issue on my system. Brand new Xiaomy Gateway updated to v149 (2.3.7) My Domoticz is on Xpenology DSM 6.1, last jadahl version ( Was on Stable but try beta too) and same error for me : 2017-10-30 19:22 ...