Somfy Tahoma Bridge Connection Error

Tags: #<Tag:0x00007fc8ea054118> #<Tag:0x00007fc8ea054050>


Does anybody else experience connection issues with the Somfy Tahoma Bridge recently?

A few days ago the bridge started to go offline and online frequently throughout the day. Since two days the bridge won’t connect at all anymore, giving me an error "Communication Error: Authentication Challenge“. The Connexon App still works fine, connectivity is okay, credentials are correct…


yes I have the same issue since yesterday evening. I can’t control the blinds from the KNX buttons anymore, but the SomfyTahoma app works (as it is a local connection). Hope Somfy will fix the issue and it is not a permanent change in their API.

Any idea what could be wrong? I tried stopping Openhab, cleaned the cache and rebooted, as suggested in a different thread but without any success.

The error stays the same:

2021-04-02 11:26:51.589 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'somfytahoma:bridge:c472dfdf' changed from INITIALIZING to OFFLINE (COMMUNICATION_ERROR): Authentication challenge


I’ve got the same issue since today in the morning.
Did you find a solution?

Not yet unfortunately. But there’s another thread where some people are currently debugging and trying to figure out what’s happening: Tahoma Binding compatible with OH2 - #540 by gcatellani

A solution has been found. Eventually, Somfy made some changes to their rate limit. locks the account after too many connection attempts from Openhab.

  1. Try disable the binding for a few hours, so openhab stops making connection attempts. Renable after a few hours and see if the problem has solved.
  2. If the problem persists, go to and reset your password after disabling the openhab binding. Wait for a few hours before you re-enable it and the issue will be gone.

Optional: Change the request threshold in openhab from 30 to 60 seconds to make sure the issue is not occurring again.

My system is now back online and hasn’t stopped working in 24 hours.

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