"skipping undecryptable file name" notices

What is the problem you are having with rclone?

I’m not precisely sure with which version of rclone this started happening, but after updating recently, I have started seeing the following notice when running “rclone sync” with two of my encrypted remote folders -

NOTICE: ꏺ沣庘媘䃨蓪㹓鶗❈㕟肩ҿ䐷莈䵷嘑厳蜼㝮燉磕葜熞玽ᆕ愬聇谈礆䂡㇞倝俵髼ɟ/㿄䈸㤦槚蝄⡘䘺欹嶃▸萰固ߊ哙ᣓ䥼禰痰㯔䅀㛞晪㯔伔闕ꂟ (Conflict ): Skipping undecryptable file name: illegal base32768 data at input byte 52

The sync still seems to complete OK, but if there’s a problem with my files, I’d like to fix it!

I use several other rclone commands similar to the below which do not produce the notice, and differ only in the path/folder that I am trying to synchronise (but these directories are all on the same, encrypted remote). This makes me think that either -

(a) there’s a couple of files on my system which are causing trouble somehow, but I do not know how to (locally) map/decode the base32768-encoded names to pinpoint them, or

(b) maybe there’s something in rclone’s name encryption routine which “doesn’t like” certain filenames (since I only have this problem with (I think) two files out of tens of thousands)…

Run the command 'rclone version' and share the full output of the command.

rclone v1.73.1
- os/version: debian 11.11 (64 bit)
- os/kernel: 4.4.59+ (x86_64)
- os/type: linux
- os/arch: amd64
- go/version: go1.25.7
- go/linking: static
- go/tags: none

Which cloud storage system are you using? (eg Google Drive)

jottacloud

The command you were trying to run (eg rclone copy /tmp remote:tmp)

rclone sync --progress --jottacloud-no-versions --jottacloud-hard-delete --low-level-retries 30 --delete-before --transfers 4 --order-by modtime,ascending --check-first --exclude-from /root/rclone_exclude "/path/to/files" "jottacloud_encrypted:Diskstation/path/to/files"

Please run 'rclone config redacted' and share the full output. If you get command not found, please make sure to update rclone.

[jottacloud_encrypted]
type = crypt
remote = jottacloud_unencrypted:backups
filename_encoding = base32768
password = XXX
password2 = XXX

[jottacloud_unencrypted]
type = jottacloud
configVersion = 1
client_id = XXX
client_secret = 
tokenURL = https://id.jottacloud.com/auth/realms/jottacloud/protocol/openid-connect/token
token = XXX
device = 
mountpoint = 

A log from the command that you were trying to run with the -vv flag

2026/02/28 17:20:46 DEBUG : rclone: Version "v1.73.1" starting with parameters ["rclone" "sync" "--progress" "--jottacloud-no-versions" "--jottacloud-hard-delete" "--low-level-retries" "30" "--delete-before" "--transfers" "4" "--order-by" "modtime,ascending" "--check-first" "--exclude-from" "/root/rclone_exclude" "/path/to/files" "jottacloud_encrypted:Diskstation/path/to/files" "-vv" "--log-file" "t.txt"]
2026/02/28 17:20:46 DEBUG : Creating backend with remote "/path/to/files"
2026/02/28 17:20:46 DEBUG : Using config file from "/home/admin/.config/rclone/rclone.conf"
2026/02/28 17:20:46 DEBUG : Creating backend with remote "jottacloud_encrypted:Diskstation/path/to/files"
2026/02/28 17:20:46 DEBUG : Creating backend with remote "jottacloud_unencrypted:backups/夦⛼妇觜⚴痋歄泀㚿/酏䑝䤻榊瀱䆥淶䤒柟/ꏺ沣庘媘䃨蓪㹓鶗❈㕟肩ҿ䐷莈䵷嘑厳蜼㝮燉磕葜熞玽ᆕ愬聇谈礆䂡㇞倝俵髼ɟ"
2026/02/28 17:20:46 DEBUG : jottacloud_unencrypted: detected overridden config - adding "{Z4Gpd}" suffix to name
2026/02/28 17:20:47 DEBUG : fs cache: renaming cache item "jottacloud_unencrypted:backups/夦⛼妇觜⚴痋歄泀㚿/酏䑝䤻榊瀱䆥淶䤒柟/ꏺ沣庘媘䃨蓪㹓鶗❈㕟肩ҿ䐷莈䵷嘑厳蜼㝮燉磕葜熞玽ᆕ愬聇谈礆䂡㇞倝俵髼ɟ" to be canonical "jottacloud_unencrypted{Z4Gpd}:backups/夦⛼妇觜⚴痋歄泀㚿/酏䑝䤻榊瀱䆥淶䤒柟/ꏺ沣庘媘䃨蓪㹓鶗❈㕟肩ҿ䐷莈䵷嘑厳蜼㝮燉磕葜熞玽ᆕ愬聇谈礆䂡㇞倝俵髼ɟ"
2026/02/28 17:20:47 DEBUG : fs cache: switching user supplied name "jottacloud_unencrypted:backups/夦⛼妇觜⚴痋歄泀㚿/酏䑝䤻榊瀱䆥淶䤒柟/ꏺ沣庘媘䃨蓪㹓鶗❈㕟肩ҿ䐷莈䵷嘑厳蜼㝮燉磕葜熞玽ᆕ愬聇谈礆䂡㇞倝俵髼ɟ" for canonical name "jottacloud_unencrypted{Z4Gpd}:backups/夦⛼妇觜⚴痋歄泀㚿/酏䑝䤻榊瀱䆥淶䤒柟/ꏺ沣庘媘䃨蓪㹓鶗❈㕟肩ҿ䐷莈䵷嘑厳蜼㝮燉磕葜熞玽ᆕ愬聇谈礆䂡㇞倝俵髼ɟ"
2026/02/28 17:20:47 INFO  : Encrypted drive 'jottacloud_encrypted:Diskstation/path/to/files': Running all checks before starting transfers
2026/02/28 17:20:47 DEBUG : Waiting for deletions to finish
2026/02/28 17:20:47 DEBUG : @eaDir: Excluded
2026/02/28 17:20:47 NOTICE: 㿄䈸㤦槚蝄⡘䘺欹嶃▸萰固ߊ哙ᣓ䥼禰痰㯔䅀㛞晪㯔伔闕ꂟ (Conflict ): Skipping undecryptable file name: illegal base32768 data at input byte 52
2026/02/28 17:20:47 DEBUG : Encrypted drive 'jottacloud_encrypted:Diskstation/path/to/files': Waiting for checks to finish
2026/02/28 17:20:47 INFO  : Encrypted drive 'jottacloud_encrypted:Diskstation/path/to/files': Checks finished, now starting transfers
2026/02/28 17:20:47 DEBUG : Encrypted drive 'jottacloud_encrypted:Diskstation/path/to/files': Waiting for transfers to finish
2026/02/28 17:20:47 INFO  : Encrypted drive 'jottacloud_encrypted:Diskstation/path/to/files': Running all checks before starting transfers
2026/02/28 17:20:47 DEBUG : @eaDir: Excluded
2026/02/28 17:20:47 NOTICE: 㿄䈸㤦槚蝄⡘䘺欹嶃▸萰固ߊ哙ᣓ䥼禰痰㯔䅀㛞晪㯔伔闕ꂟ (Conflict ): Skipping undecryptable file name: illegal base32768 data at input byte 52
2026/02/28 17:20:47 DEBUG : Filename.exe: size = 2871550 OK
2026/02/28 17:20:47 DEBUG : Filename.exe: Size and modification time the same (differ by 0s, within tolerance 1s)
2026/02/28 17:20:47 DEBUG : Filename.exe: Unchanged skipping
...
<Many similar entries like the previous 3 lines>
...
2026/02/28 17:20:47 INFO  : Encrypted drive 'jottacloud_encrypted:Diskstation/path/to/files': Checks finished, now starting transfers
2026/02/28 17:20:47 DEBUG : Encrypted drive 'jottacloud_encrypted:Diskstation/path/to/files': Waiting for transfers to finish
2026/02/28 17:20:47 INFO  : There was nothing to transfer
2026/02/28 17:20:47 INFO  : 
Transferred:   	          0 B / 0 B, -, 0 B/s, ETA -
Checks:               289 / 289, 100%, Listed 1158
Elapsed time:         0.5s

2026/02/28 17:20:47 DEBUG : 9 go routines active

welcome to the forum,

can you please post the output of
rclone test info --check-base32768 jottacloud_unencrypted:backups

Sure -

2026/02/28 18:19:31 NOTICE: jottacloud root 'backups/rclone-test-info-yeduzug7/test-base32768': 0 differences found
2026/02/28 18:19:31 NOTICE: jottacloud root 'backups/rclone-test-info-yeduzug7/test-base32768': 1028 matching files
// jottacloud_unencrypted
base32768isOK = true // make sure maxFileLength for 2 byte unicode chars is the same as for 1 byte characters

Does that give any clues?

actually, i should have asked you to run
rclone test info --check-base32768 --check-length jottacloud_unencrypted:backups:


rclone test info --check-base32768 --check-length onedrivevb:
2026/02/28 13:32:03 NOTICE: OneDrive root 'rclone-test-info-wavibaz0/test-base32768': 0 differences found
2026/02/28 13:32:03 NOTICE: OneDrive root 'rclone-test-info-wavibaz0/test-base32768': 1028 matching files
// onedrivevb
maxFileLength = 337 // for 1 byte unicode characters
maxFileLength = 337 // for 2 byte unicode characters
maxFileLength = 337 // for 3 byte unicode characters
maxFileLength = 168 // for 4 byte unicode characters
base32768isOK = true // make sure maxFileLength for 2 byte unicode chars is the same as for 1 byte characters

No problem, happy to run that one, too :slight_smile:

Result -

2026/02/28 18:57:22 NOTICE: jottacloud root 'backups:/rclone-test-info-ruwugef4/test-base32768': 0 differences found
2026/02/28 18:57:22 NOTICE: jottacloud root 'backups:/rclone-test-info-ruwugef4/test-base32768': 1028 matching files
// jottacloud_unencrypted
maxFileLength = 255 // for 1 byte unicode characters
maxFileLength = 255 // for 2 byte unicode characters
maxFileLength = 255 // for 3 byte unicode characters
maxFileLength = 127 // for 4 byte unicode characters
base32768isOK = true // make sure maxFileLength for 2 byte unicode chars is the same as for 1 byte characters