I couldn’t even get the browser GUI to load, let alone connect to my Debian device.
The cmd window pops up, cycles about 20 times before closing.
full copy from the log is this.
[start] 2025/04/02 14:48:27 INFO: syncthing v1.29.4 “Gold Grasshopper” (go1.24.1 windows-amd64) builder@github.syncthing.net 2025-03-27 09:31:51 UTC
[S6HDM] 2025/04/02 14:48:27 INFO: My ID: S6HDM4D-ZTD25A3-6WYJUNX-FCH2FM4-NNRCZUY-TNX4BCH-UR26CTQ-2OBYBA2
[S6HDM] 2025/04/02 14:48:28 INFO: Hashing performance is 1179.05 MB/s
[S6HDM] 2025/04/02 14:48:28 WARNING: Database schema: database version 7 is too old to be upgraded directly; step via Syncthing v1.27.0 to upgrade
[S6HDM] 2025/04/02 14:48:28 INFO: Exiting
The version you’re trying to run still says syncthing v1.29.4. I think what may be happening is that you’re trying to run syncthing v1.27.0, however it auto-upgrades itself immediately, and then fails to process the database.
How about trying to start syncthing v1.27.0 with the --no-upgrade option enabled?