Joining a room failed with federation.LookupRoomAlias failed

[mio-19]

Background information

• Dendrite version or git SHA: ghcr.io/element-hq/dendrite-monolith:latest ghcr.io/element-hq/dendrite-monolith latest 92e825d0dce0 5 months ago 113MB
• SQLite3 or Postgres?:postgres postgres:15-alpine
• Running in Docker?: yes
• go version: N/A
• Client used (if applicable): Element on macos

Description

• What is the problem: joining a room on a different server
• Who is affected: myself on my dendrite server
• How is this bug manifesting: in server log level=error msg="federation.LookupRoomAlias failed"
• When did this first appear: When I tried to join https://matrix.to/#/#qubes:invisiblethingslab.com. Previously I joined many room on different servers fine

Steps to reproduce

• list the steps
• that reproduce the bug
• using hyphens as bullet points

Join the room #qubes:invisiblethingslab.com

server log:

monolith-1  | 2025/06/21 08:01:29 http: superfluous response.WriteHeader call from github.com/element-hq/dendrite/mediaapi/routing.makeDownloadAPI.func1 (routing.go:206)
monolith-1  | 2025/06/21 08:01:29 http: superfluous response.WriteHeader call from github.com/element-hq/dendrite/mediaapi/routing.makeDownloadAPI.func1 (routing.go:206)
monolith-1  | 2025/06/21 08:01:31 http: superfluous response.WriteHeader call from github.com/element-hq/dendrite/mediaapi/routing.makeDownloadAPI.func1 (routing.go:206)
monolith-1  | time="2025-06-21T08:01:34.050028769Z" level=error msg="federation.LookupRoomAlias failed" error="contents=[123 34 101 114 114 99 111 100 101 34 58 34 77 95 85 78 65 85 84 72 79 82 73 90 69 68 34 4
4 34 101 114 114 111 114 34 58 34 70 97 105 108 101 100 32 116 111 32 102 105 110 100 32 97 110 121 32 107 101 121 32 116 111 32 115 97 116 105 115 102 121 58 32 95 70 101 116 99 104 75 101 121 82 101 113 117 1
01 115 116 40 115 101 114 118 101 114 95 110 97 109 101 61 39 109 97 116 114 105 120 46 109 105 111 49 57 46 117 107 39 44 32 109 105 110 105 109 117 109 95 118 97 108 105 100 95 117 110 116 105 108 95 116 115 61 49 55 53 48 52 57 50 56 57 51 49 52 48 44 32 107 101 121 95 105 100 115 61 91 39 101 100 50 53 53 49 57 58 99 97 109 112 81 77 39 93 41 34 125] msg=Failed to GET JSON (hostname \"invisiblethingslab.com\" path \"/_matrix/federation/v1/query/directory\") code=401 wrapped=M_UNAUTHORIZED: Failed to find any key to satisfy: _FetchKeyRequest(server_name='matrix.mio19.uk', minimum_valid_until_ts=1750492893140, key_ids=['ed25519:campQM'])" req.id=pgCqexw8rsmF req.method=GET req.path="/_matrix/client/v3/directory/room/#qubes:invisiblethingslab.com"
postgres-1  | 2025-06-21 08:01:44.449 UTC [28] LOG:  checkpoint starting: time
monolith-1  | time="2025-06-21T08:03:48.869023279Z" level=error msg="federation.LookupRoomAlias failed" error="contents=[123 34 101 114 114 99 111 100 101 34 58 34 77 95 85 78 65 85 84 72 79 82 73 90 69 68 34 4
4 34 101 114 114 111 114 34 58 34 70 97 105 108 101 100 32 116 111 32 102 105 110 100 32 97 110 121 32 107 101 121 32 116 111 32 115 97 116 105 115 102 121 58 32 95 70 101 116 99 104 75 101 121 82 101 113 117 101 115 116 40 115 101 114 118 101 114 95 110 97 109 101 61 39 109 97 116 114 105 120 46 109 105 111 49 57 46 117 107 39 44 32 109 105 110 105 109 117 109 95 118 97 108 105 100 95 117 110 116 105 108 95 116 115
61 49 55 53 48 52 57 51 48 50 55 57 54 54 44 32 107 101 121 95 105 100 115 61 91 39 101 100 50 53 53 49 57 58 99 97 109 112 81 77 39 93 41 34 125] msg=Failed to GET JSON (hostname \"invisiblethingslab.com\" pat
h \"/_matrix/federation/v1/query/directory\") code=401 wrapped=M_UNAUTHORIZED: Failed to find any key to satisfy: _FetchKeyRequest(server_name='matrix.mio19.uk', minimum_valid_until_ts=1750493027966, key_ids=['ed25519:campQM'])" req.id=dNrGhj7GSq97 req.method=GET req.path="/_matrix/client/v3/directory/room/#qubes:invisiblethingslab.com"