Same problem with my installation since yesterday: devices published to Alexa via myopenhab.org are offline in Alexa device list, when trying to access openHAB’s dashboard I get " 504 Gateway Time-out".
Openhab.log
2018-11-11 03:05:37.894 [ERROR] [io.openhabcloud.internal.CloudClient] - Socket.IO error: {}
2018-11-11 03:05:37.908 [INFO ] [io.openhabcloud.internal.CloudClient] - Disconnected from the openHAB Cloud service (UUID = deleted, base URL = http://localhost:8080)Similar problem was e.g. reported in November 2017, see Openhab 2 losing cloud connection.
@digitaldan and @MARZIMA could you take a look on that when you have time?
Regards,
Andy