Clients think remote device is out-of-sync but it isn't

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johannes (Johannes) · 2026-06-01 · via Syncthing Community Forum - Latest topics

May 31, 2026, 5:57pm 1

All four mentioned devices are on 2.1.0, a mixture of Windows and Linux machines.

On Device A (receive-only), I had to start over with a new Syncthing database due to a mishap while trying to move the database to a different folder, but synced files were kept intact. The database is now recreated, and Device A thinks the sync folder is up-to-date: Certainly, the files on-disk are all there as before, they are identical to the files on the other machines, and the file count in the shared folder is identical on all devices. So from Device A’s perspective, everything is alright. However, two other Device B & C (both configured as send & receive) show that about 21,000 files are out of sync on Device A. I did skim the list of files that are reported to be out of date and they are all present in the sync folder on Device A. Device B & C both make no progress on this number. As far as a fourth Device D is concerned, Device A is up-to-date and has no out-of-sync files.

How can I diagnose what’s going wrong here?

calmh (Jakob Borg) May 31, 2026, 6:53pm 2

Firstly, since the device is receive-only and you did a strange thing, see if it has a “revert local changes” button. If so, press it.

If not:

Pick a representative out-of-sync file. Run syncthing debug database-counts <folderID> and syncthing debug database-file <folderID> <filename> on both sides and paste the output. The filename part in the latter command accepts a partial match, so you can give just the file name without the path in the folder etc.

E.g., what we expect to see:

jb@jbo-m3wl72rv:~ % syncthing debug database-counts w3ejt-fn4dm
DEVICE   TYPE       FLAGS    DELETED  COUNT   SIZE
-local-  FILE       -------  ---      0       0
-local-  FILE       -------  del      0       0
...more...
PSEUDOP  DIRECTORY  -nG----  ---      0       0
PSEUDOP  DIRECTORY  -nG----  del      0       0

jb@jbo-m3wl72rv:~ % syncthing debug database-file w3ejt-fn4dm 20150103-145351-0345.jpg
DEVICE   TYPE  NAME                                        SEQUENCE  DELETED  MODIFIED              SIZE     FLAGS    VERSION             BLOCKLIST
-local-  FILE  2015/Hemma/iPhone/20150103-145351-0345.jpg  202795    ---      2015-04-26T19:54:27Z  1073016  --G----  PSEUDOP:1744214844  tOJxBYSV
PSEUDOP  FILE  2015/Hemma/iPhone/20150103-145351-0345.jpg  673968    ---      2015-04-26T19:54:27Z  1073016  -------  PSEUDOP:1744214844  tOJxBYSV

Ideally, also take a support bundle (Actions -> Support bundle in the GUI) from both sides. That contains your config and some logs and metrics, in lightly redacted form, so you can send them as direct messages if you prefer.

johannes (Johannes) June 2, 2026, 7:43pm 3

It is in completely pristine state, no local changes.

But I have a hunch that the real problem is that I moved the database from the OS microSD card to an external hard drive to reduce flash memory wear. Syncthing is completely unresponsive for large amounts of times, while it was mostly fine before the move. So it could be that the other clients are stuck in eternal limbo that they are not able to verify that all files are synchronized (but they still do manage to realize that files I have synced since then have been updated on the remote client as well). I’m not even able to create the support bundle on that machine because the browser tries loading the page but then it’s just stuck forever.

Anyway, one of the send-receive clients:

syncthing debug database-counts v3frg-au6mt
DEVICE   TYPE       FLAGS    DELETED  COUNT   SIZE
-local-  FILE       -------  ---      0       0
-local-  FILE       -------  del      0       0
-local-  FILE       ----r--  ---      0       0
-local-  FILE       --G----  ---      526454  848162321736
-local-  FILE       --G----  del      6459    0
-local-  FILE       --G-r--  ---      0       0
-local-  DIRECTORY  -------  ---      0       0
-local-  DIRECTORY  -------  del      0       0
-local-  DIRECTORY  --G----  ---      27451   3513728
-local-  DIRECTORY  --G----  del      611     78208
BVTQQPI  FILE       -------  ---      460118  841187782873
BVTQQPI  FILE       -------  del      5301    0
BVTQQPI  FILE       --G----  ---      0       0
BVTQQPI  FILE       --G----  del      11      0
BVTQQPI  FILE       -nG----  ---      0       0
BVTQQPI  FILE       -nG----  del      0       0
BVTQQPI  FILE       v------  ---      66336   0
BVTQQPI  FILE       v------  del      11      0
BVTQQPI  DIRECTORY  -------  ---      24632   3152896
BVTQQPI  DIRECTORY  -------  del      548     70144
BVTQQPI  DIRECTORY  -nG----  del      0       0
BVTQQPI  DIRECTORY  v------  ---      2819    360832
BVTQQPI  DIRECTORY  v------  del      4       512
THJTAAV  FILE       -------  ---      526394  848100106215
THJTAAV  FILE       -------  del      6027    0
THJTAAV  FILE       --G----  ---      0       0
THJTAAV  FILE       --G----  del      120     0
THJTAAV  FILE       -nG----  ---      0       0
THJTAAV  FILE       -nG----  del      0       0
THJTAAV  FILE       v------  ---      60      0
THJTAAV  FILE       v------  del      0       0
THJTAAV  FILE       v-G----  del      0       0
THJTAAV  DIRECTORY  -------  ---      27442   3512576
THJTAAV  DIRECTORY  -------  del      598     76544
THJTAAV  DIRECTORY  --G----  del      0       0
THJTAAV  DIRECTORY  -nG----  ---      0       0
THJTAAV  DIRECTORY  -nG----  del      0       0
THJTAAV  DIRECTORY  v------  ---      9       1152
HVUDRTK  FILE       -------  ---      0       0
HVUDRTK  FILE       -------  del      0       0
HVUDRTK  FILE       --G----  ---      0       0
HVUDRTK  FILE       --G----  del      0       0
HVUDRTK  FILE       -nG----  ---      0       0
HVUDRTK  FILE       -nG----  del      0       0
HVUDRTK  FILE       v------  ---      0       0
HVUDRTK  FILE       v-G----  ---      0       0
HVUDRTK  DIRECTORY  -------  ---      0       0
HVUDRTK  DIRECTORY  -------  del      0       0
HVUDRTK  DIRECTORY  -nG----  ---      0       0
HVUDRTK  DIRECTORY  -nG----  del      0       0
VHQXY2U  FILE       -------  ---      506758  773377308109
VHQXY2U  FILE       -------  del      4005    0
VHQXY2U  FILE       --G----  ---      0       0
VHQXY2U  FILE       --G----  del      10      0
VHQXY2U  FILE       -nG----  ---      0       0
VHQXY2U  FILE       -nG----  del      0       0
VHQXY2U  FILE       v------  ---      0       0
VHQXY2U  FILE       v-G----  ---      0       0
VHQXY2U  DIRECTORY  -------  ---      25834   3306752
VHQXY2U  DIRECTORY  -------  del      450     57600
VHQXY2U  DIRECTORY  --G----  del      0       0
QLFSI6G  FILE       -------  ---      526454  848162321736
QLFSI6G  FILE       -------  del      7       0
QLFSI6G  FILE       -nG----  ---      0       0
QLFSI6G  FILE       -nG----  del      0       0
QLFSI6G  DIRECTORY  -------  ---      27451   3513728
QLFSI6G  DIRECTORY  -------  del      1       128
QLFSI6G  DIRECTORY  -nG----  ---      0       0
QLFSI6G  DIRECTORY  -nG----  del      0       0

syncthing debug database-file v3frg-au6mt trinity-samples.zip
DEVICE   TYPE  NAME                                                             SEQUENCE  DELETED  MODIFIED                      SIZE      FLAGS    VERSION             BLOCKLIST
-local-  FILE  Audiosoftware/Alchemist (Trinity To Triton)/trinity-samples.zip  3259103   ---      2022-03-16T18:52:42.7549393Z  41680330  --G----  BMXPQP6:1758805844  Fi2Sb1ZW
BVTQQPI  FILE  Audiosoftware/Alchemist (Trinity To Triton)/trinity-samples.zip  3293478   ---      2022-03-16T18:52:42.7549393Z  41680330  -------  BMXPQP6:1758805844  Fi2Sb1ZW
THJTAAV  FILE  Audiosoftware/Alchemist (Trinity To Triton)/trinity-samples.zip  3280118   ---      2022-03-16T18:52:42.7549393Z  41680330  -------  BMXPQP6:1758805844  Fi2Sb1ZW
QLFSI6G  FILE  Audiosoftware/Alchemist (Trinity To Triton)/trinity-samples.zip  3408259   ---      2022-03-16T18:52:42.7549393Z  41680330  -------  BMXPQP6:1758805844  Fi2Sb1ZW
-local-  FILE  Audiosoftware/Alchemist/trinity-samples.zip                      3259104   del      2025-09-25T13:12:39.7549393Z  0         --G----  BMXPQP6:1758805959  -nil-
BVTQQPI  FILE  Audiosoftware/Alchemist/trinity-samples.zip                      3293479   del      2025-09-25T13:12:39.7549393Z  0         -------  BMXPQP6:1758805959  -nil-
THJTAAV  FILE  Audiosoftware/Alchemist/trinity-samples.zip                      3280119   del      2025-09-25T13:12:39.7549393Z  0         -------  BMXPQP6:1758805959  -nil-

And the receive-only client (in case there are any inconsistencies):

syncthing debug database-counts v3frg-au6mt
DEVICE   TYPE       FLAGS    DELETED  COUNT   SIZE
-local-  FILE       -------  ---      0       0
-local-  FILE       -------  del      0       0
-local-  FILE       ---e---  ---      0       0
-local-  FILE       --G----  ---      526441  847580937619
-local-  FILE       --G----  del      6555    0
-local-  FILE       --Ge---  ---      0       0
-local-  DIRECTORY  -------  ---      0       0
-local-  DIRECTORY  -------  del      0       0
-local-  DIRECTORY  --G----  ---      27449   3513472
-local-  DIRECTORY  --G----  del      612     78336
BMXPQP6  FILE       -------  ---      526441  847580937619
BMXPQP6  FILE       -------  del      6461    0
BMXPQP6  FILE       --G----  del      11      0
BMXPQP6  FILE       -nG----  ---      0       0
BMXPQP6  FILE       -nG----  del      0       0
BMXPQP6  FILE       v------  ---      0       0
BMXPQP6  FILE       v-G----  ---      0       0
BMXPQP6  DIRECTORY  -------  ---      27449   3513472
BMXPQP6  DIRECTORY  -------  del      612     78336
BMXPQP6  DIRECTORY  --G----  del      0       0
BMXPQP6  DIRECTORY  -nG----  ---      0       0
BMXPQP6  DIRECTORY  -nG----  del      0       0
HVUDRTK  FILE       -------  ---      0       0
HVUDRTK  FILE       -------  del      0       0
HVUDRTK  FILE       --G----  del      0       0
HVUDRTK  FILE       -nG----  ---      0       0
HVUDRTK  FILE       -nG----  del      0       0
HVUDRTK  FILE       v------  ---      0       0
HVUDRTK  FILE       v-G----  ---      0       0
HVUDRTK  DIRECTORY  -------  ---      0       0
HVUDRTK  DIRECTORY  -------  del      0       0
HVUDRTK  DIRECTORY  --G----  del      0       0
HVUDRTK  DIRECTORY  -nG----  ---      0       0
HVUDRTK  DIRECTORY  -nG----  del      0       0
THJTAAV  FILE       -------  ---      526381  847518722098
THJTAAV  FILE       -------  del      6113    0
THJTAAV  FILE       --G----  del      47      0
THJTAAV  FILE       -nG----  ---      0       0
THJTAAV  FILE       -nG----  del      0       0
THJTAAV  FILE       v------  ---      60      0
THJTAAV  FILE       v------  del      0       0
THJTAAV  DIRECTORY  -------  ---      27440   3512320
THJTAAV  DIRECTORY  -------  del      599     76672
THJTAAV  DIRECTORY  --G----  del      0       0
THJTAAV  DIRECTORY  -nG----  ---      0       0
THJTAAV  DIRECTORY  -nG----  del      0       0
THJTAAV  DIRECTORY  v------  ---      9       1152
BVTQQPI  FILE       -------  ---      460087  839865216370
BVTQQPI  FILE       -------  del      5308    0
BVTQQPI  FILE       --G----  del      0       0
BVTQQPI  FILE       -nG----  ---      0       0
BVTQQPI  FILE       -nG----  del      0       0
BVTQQPI  FILE       v------  ---      66336   0
BVTQQPI  FILE       v------  del      11      0
BVTQQPI  DIRECTORY  -------  ---      24629   3152512
BVTQQPI  DIRECTORY  -------  del      548     70144
BVTQQPI  DIRECTORY  -nG----  ---      0       0
BVTQQPI  DIRECTORY  -nG----  del      0       0
BVTQQPI  DIRECTORY  v------  ---      2819    360832
BVTQQPI  DIRECTORY  v------  del      4       512
QLFSI6G  FILE       -------  ---      526441  847580937619
QLFSI6G  FILE       -------  del      4       0
QLFSI6G  FILE       --G----  del      0       0
QLFSI6G  FILE       -nG----  ---      0       0
QLFSI6G  FILE       -nG----  del      0       0
QLFSI6G  FILE       v------  ---      0       0
QLFSI6G  DIRECTORY  -------  ---      27449   3513472
QLFSI6G  DIRECTORY  -------  del      1       128
QLFSI6G  DIRECTORY  -nG----  ---      0       0
QLFSI6G  DIRECTORY  v------  ---      0       0

syncthing debug database-file v3frg-au6mt trinity-samples.zip
DEVICE   TYPE  NAME                                                             SEQUENCE  DELETED  MODIFIED                      SIZE      FLAGS    VERSION             BLOCKLIST
-local-  FILE  Audiosoftware/Alchemist (Trinity To Triton)/trinity-samples.zip  3271757   ---      2022-03-16T18:52:42.7549393Z  41680330  --G----  BMXPQP6:1758805844  Fi2Sb1ZW
BMXPQP6  FILE  Audiosoftware/Alchemist (Trinity To Triton)/trinity-samples.zip  3258271   ---      2022-03-16T18:52:42.7549393Z  41680330  -------  BMXPQP6:1758805844  Fi2Sb1ZW
THJTAAV  FILE  Audiosoftware/Alchemist (Trinity To Triton)/trinity-samples.zip  3279284   ---      2022-03-16T18:52:42.7549393Z  41680330  -------  BMXPQP6:1758805844  Fi2Sb1ZW
BVTQQPI  FILE  Audiosoftware/Alchemist (Trinity To Triton)/trinity-samples.zip  3292688   ---      2022-03-16T18:52:42.7549393Z  41680330  -------  BMXPQP6:1758805844  Fi2Sb1ZW
QLFSI6G  FILE  Audiosoftware/Alchemist (Trinity To Triton)/trinity-samples.zip  3410503   ---      2022-03-16T18:52:42.7549393Z  41680330  -------  BMXPQP6:1758805844  Fi2Sb1ZW
-local-  FILE  Audiosoftware/Alchemist/trinity-samples.zip                      3271758   del      2025-09-25T13:12:39.7549393Z  0         --G----  BMXPQP6:1758805959  -nil-
BMXPQP6  FILE  Audiosoftware/Alchemist/trinity-samples.zip                      3258272   del      2025-09-25T13:12:39.7549393Z  0         -------  BMXPQP6:1758805959  -nil-
THJTAAV  FILE  Audiosoftware/Alchemist/trinity-samples.zip                      3279285   del      2025-09-25T13:12:39.7549393Z  0         -------  BMXPQP6:1758805959  -nil-
BVTQQPI  FILE  Audiosoftware/Alchemist/trinity-samples.zip                      3292689   del      2025-09-25T13:12:39.7549393Z  0         -------  BMXPQP6:1758805959  -nil-

johannes (Johannes) June 7, 2026, 8:42pm 4

It turns out that the client was indeed extremely busy and just stopped exchanging information about these files with the other clients. Now after updating to 2.1.1 they are all up-to-date.

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