Synology Reverse Proxy : Unable to connect Hassio


I’m a newbie 39 years french user of Hassio and having an issue with Reverse Proxy (from Synology) to contact my Hassio installed on a NUC.

I can reach it localy, all is working, but from my Dyndns adress, when login : Unable to connect to Home Assistant. Retry …

I tryied to follow some tips from Hassio forum but not sure what to do. Any advice ?

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