Could not establish connection to the Collabora Online server. How to debug?

sounds like your Allow List for WOPI requests lacks your IPv6 address. The system performs public DNS resolution and in turn connects there (and often prefers IPv6) - sometimes this results in strange issues inside on Docker container (e.g. firewall issues). Please review Collabora integration guide to understand the communication triangle. IPv6 only, can't connect to itself and Topics tagged ipv6 & aio might help

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