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Maurice
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The DSM trusted-device token lived in process memory only. After a restart every token was gone and the stored one-time code long spent, so every two-factor NAS binding stopped syncing until its owner typed a fresh code, and nothing on screen said why. The token is now kept in the connection's encrypted secrets, together with a digest of the instance and account it was issued for. A saved connection's ref carries a saveSecret callback that writes through DocSyncConfigService.saveEarnedSecret, which rereads the row inside a transaction so a sync run holding an old ref cannot undo a password the owner changed meanwhile. The key belongs to no form field, so maskSecrets never reports it and mergeSecrets never touches it: the GET and PUT payloads do not carry it, an edit keeps it, and a client cannot plant one. It survives a password edit and a spent or cleared code. A connection repointed at another NAS or account drops it on its next call, and a token DSM refuses with 403 or 404 is dropped in memory and in storage. A probe of form values and an unsaved form may use what is stored but never write. A refused token no longer shadows a fresh code: the code in the form gets its turn in the same login call. In memory the slot is keyed by the connection id together with the row's created_at. A backup restored in place or the demo reset rolls the id sequence back without a restart, and a new connection that reused an id must not log in on the token of the row it replaced. The Synology adapter receives its client through DI like Paperless and WebDAV, instead of building a second instance beside the one the module registers. Two readings of a failed request are settled as well: - INVALID_PURPOSE, INVALID_CA and PATH_LENGTH_EXCEEDED count as an untrusted certificate again, so the settings screen offers the self-signed switch. Papra used to find them through the message text, and the shared classifier reads codes only. - A host that never completes the TCP handshake reads as unreachable on every client. WebDAV said timeout before the shared transport; the change is now documented and tested.