Error 400 in backup process with Ionos S3 Object Storage

[halima632]

I had the same 400 error with IONOS S3 and it turned out to be a simple setup issue. In Cloudron’s backup settings, make sure you select the IONOS (Profitbricks) option instead of the generic S3 choice. Then double-check that the endpoint and region match your bucket exactly—for example s3.<your-region>.ionoscloud.com—and that path-style URLs are enabled. After I corrected those settings, the backups ran without any errors. If you still get the 400 after that, try a small manual backup or upload a tiny file with the same keys using the AWS CLI to confirm the credentials. If the problem persists, sharing the few log lines just before the crash will help others spot what’s wrong.

Hope this helps get your backups running smoothly.

[dsp76]

Hi @james ,
Hetzner Object Storage ≠ Hetzner Storage Box (thats what I was using as alternative backup target). I didn't try the Object Storage.

@halima632 that was a good hint! Just switched to the IONOS (Profitbricks) entry and it seems to run fine. I didn't know it existed and thought it was "S3 compatible" and fine

[dsp76]

Unfortunately even with the correct IONOS Settings from my Hetzner based Cloudron.

It started crashing again every night since a week now. Thats the anonymised log:

Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/autoptimize_snippet_********.js file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/autoptimize/js/index.html file
Oct 15 04:12:36 box:backupformat/tgz tarPack: processing /home/***/appsdata/********/data/public/wp-content/cache/borlabs-cookie
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/borlabs-cookie/1 directory
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/borlabs-cookie/borlabs-cookie_1_de.css file
Oct 15 04:12:36 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/borlabs-cookie/borlabs-cookie_1_en.css file
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/borlabs-cookie/geo-ip-database-********.mmdb file
Oct 15 04:12:37 box:backupformat/tgz tarPack: processing /home/***/appsdata/********/data/public/wp-content/cache/borlabs-cookie/1
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/borlabs-cookie/1/borlabs-cookie-1-de.css file
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/borlabs-cookie/1/borlabs-cookie-1-en.css file
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/borlabs-cookie/1/borlabs-cookie-config-de.json.js file
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/cache/borlabs-cookie/1/borlabs-cookie-config-en.json.js file
Oct 15 04:12:37 box:backupformat/tgz tarPack: processing /home/***/appsdata/********/data/public/wp-content/cache/matomo
Oct 15 04:12:37 box:backupformat/tgz tarPack: processing /home/***/appsdata/********/data/public/wp-content/infinitewp
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/infinitewp/backups directory
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/infinitewp/temp directory
Oct 15 04:12:37 box:backupformat/tgz tarPack: processing /home/***/appsdata/********/data/public/wp-content/infinitewp/backups
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/infinitewp/backups/DE_clCPUUsage.****.txt file
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/infinitewp/backups/DE_clMemoryPeak.****.txt file
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/infinitewp/backups/DE_clMemoryUsage.****.txt file
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/infinitewp/backups/DE_clTimeTaken.****.txt file
Oct 15 04:12:37 box:backupformat/tgz addToPack: added ./data/public/wp-content/infinitewp/backups/index.php file
Oct 15 04:12:42 box:tasks update ****: {"percent":21.3,"message":"Uploading backup 134M@9MBps (example.com)"}
Oct 15 04:12:42 box:storage/s3 Upload progress: {"loaded":134217728,"part":1,"key":"snapshot/app_********.tar.gz.enc"}
Oct 15 04:12:51 box:storage/s3 Upload progress: {"loaded":268435456,"part":2,"key":"snapshot/app_********.tar.gz.enc"}
Oct 15 04:12:52 box:tasks update ****: {"percent":21.3,"message":"Uploading backup 277M@14MBps (example.com)"}
Oct 15 04:13:02 box:tasks update ****: {"percent":21.3,"message":"Uploading backup 435M@16MBps (example.com)"}
Oct 15 04:13:03 box:backupformat/tgz addToPack: added ./data/public/wp-content/infinitewp/backups/example.com-de_backup_full_****-**-**_********.zip file
Oct 15 04:13:08 box:storage/s3 Upload progress: {"loaded":402653184,"part":4,"key":"snapshot/app_********.tar.gz.enc"}
Oct 15 04:13:12 box:tasks update ****: {"percent":21.3,"message":"Uploading backup 584M@15MBps (example.com)"}
Oct 15 04:13:12 AWS SDK Error: 400 Bad Request
Oct 15 04:13:12 code: 400, statusCode: 400, retryable: false
Oct 15 04:13:12 Node.js v20.18.0
Oct 15 04:13:19 box:shell backuptask: errored BoxError: backuptask exited with code 1 signal null
Oct 15 04:13:19 reason: 'Shell Error', code: 1
Oct 15 04:13:19 box:backuptask runBackupUpload: backuptask crashed BoxError: backuptask exited with code 1 signal null
Oct 15 04:13:19 box:backuptask fullBackup: app example.com backup finished. Took 67.438 seconds
Oct 15 04:13:19 box:tasks update ****: {"percent":100,"error":{"message":"Backuptask crashed"}}
Oct 15 04:13:19 BoxError: Backuptask crashed

Not sure what to do with it. Just started a manual backup, it also crashed again while uploading to IONOS.

Oct 15 11:00:05 400: null
Oct 15 11:00:05 at Request.extractError (/home/yellowtent/box/node_modules/aws-sdk/lib/services/s3.js:712:35)
Oct 15 11:00:05 at Request.callListeners (/home/yellowtent/box/node_modules/aws-sdk/lib/sequential_executor.js:106:20)
Oct 15 11:00:05 at Request.emit (/home/yellowtent/box/node_modules/aws-sdk/lib/sequential_executor.js:78:10)
Oct 15 11:00:05 at Request.emit (/home/yellowtent/box/node_modules/aws-sdk/lib/request.js:686:14)
Oct 15 11:00:05 at Request.transition (/home/yellowtent/box/node_modules/aws-sdk/lib/request.js:22:10)
Oct 15 11:00:05 at AcceptorStateMachine.runTo (/home/yellowtent/box/node_modules/aws-sdk/lib/state_machine.js:14:12)
Oct 15 11:00:05 at /home/yellowtent/box/node_modules/aws-sdk/lib/state_machine.js:26:10
Oct 15 11:00:05 at Request.<anonymous> (/home/yellowtent/box/node_modules/aws-sdk/lib/request.js:38:9)
Oct 15 11:00:05 at Request.<anonymous> (/home/yellowtent/box/node_modules/aws-sdk/lib/request.js:688:12)
Oct 15 11:00:05 at Request.callListeners (/home/yellowtent/box/node_modules/aws-sdk/lib/sequential_executor.js:116:18) {
Oct 15 11:00:05 code: 400,
Oct 15 11:00:05 region: null,
Oct 15 11:00:05 time: 2025-10-15T09:00:05.031Z,
Oct 15 11:00:05 requestId: null,
Oct 15 11:00:05 extendedRequestId: undefined,
Oct 15 11:00:05 cfId: undefined,
Oct 15 11:00:05 statusCode: 400,
Oct 15 11:00:05 retryable: false,
Oct 15 11:00:05 retryDelay: 20000
Oct 15 11:00:05 }

and

Oct 15 11:00:05 box:tasks setCompleted - 7460: {"result":null,"error":{"stack":"BoxError: Backuptask crashed\n at runBackupUpload (/home/yellowtent/box/src/backuptask.js:170:15)\n at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n at async uploadAppSnapshot (/home/yellowtent/box/src/backuptask.js:369:5)\n at async backupAppWithTag (/home/yellowtent/box/src/backuptask.js:391:5)","name":"BoxError","reason":"Internal Error","details":{},"message":"Backuptask crashed"}}
Oct 15 11:00:05 box:tasks update 7460: {"percent":100,"result":null,"error":{"stack":"BoxError: Backuptask crashed\n at runBackupUpload (/home/yellowtent/box/src/backuptask.js:170:15)\n at process.processTicksAndRejections (node:internal/process/task_queues:95:5)\n at async uploadAppSnapshot (/home/yellowtent/box/src/backuptask.js:369:5)\n at async backupAppWithTag (/home/yellowtent/box/src/backuptask.js:391:5)","name":"BoxError","reason":"Internal Error","details":{},"message":"Backuptask crashed"}}
Oct 15 11:00:05 BoxError: Backuptask crashed

The snapshot folder within the bucket (created by cloudron?) contains a couple of up to date uploads.

• Who should I with - is it IONOS? Is it cloudron? Is it Hetzner?
• Whats causing the "internal error" while uploading?
• Why is it "retryable: false"?

[dsp76]

Can I mark this as unsolved again?

[james]

Hello @dsp76 I have marked to topic as unsolved again.
Where you unable to do this yourself or was this more of a courtesy question?

[girish]

@dsp76 the retryable comes the aws sdk . It's indicating whether we should retry a failing request or not. Since retryable is false, the code gives up immediately.

Can you write to us at support@cloudron.io ? We have to debug this further to understand which request is failing and why .

[dsp76]

@james I didn't find the place where I could do it.
@girish will write you!

[CaeruleusAqua]

I've had the same problem since a week ago. The strange thing is that everything had been running flawlessly for a year. However, we recently set up a second Cloudron. The backup is stored on a different bucket and also has its own key. The problem occurs on both servers. Unfortunately, it's not deterministic.

 03:00:33 box:storage/s3 Upload progress: {"loaded":95400493056,"part":920,"key":"backup/snapshot/app_da39dd94-29b5-4049-9aa5-76864ebc4608.tar.gz.enc"}
Oct 16 03:00:33 /home/yellowtent/box/node_modules/aws-sdk/lib/services/s3.js:712
Oct 16 03:00:33 resp.error = AWS.util.error(new Error(), {
Oct 16 03:00:33 ^
Oct 16 03:00:33
Oct 16 03:00:33 400: null
Oct 16 03:00:33 at Request.extractError (/home/yellowtent/box/node_modules/aws-sdk/lib/services/s3.js:712:35)
Oct 16 03:00:33 at Request.callListeners (/home/yellowtent/box/node_modules/aws-sdk/lib/sequential_executor.js:106:20)
Oct 16 03:00:33 at Request.emit (/home/yellowtent/box/node_modules/aws-sdk/lib/sequential_executor.js:78:10)
Oct 16 03:00:33 at Request.emit (/home/yellowtent/box/node_modules/aws-sdk/lib/request.js:686:14)
Oct 16 03:00:33 at Request.transition (/home/yellowtent/box/node_modules/aws-sdk/lib/request.js:22:10)
Oct 16 03:00:33 at AcceptorStateMachine.runTo (/home/yellowtent/box/node_modules/aws-sdk/lib/state_machine.js:14:12)
Oct 16 03:00:33 at /home/yellowtent/box/node_modules/aws-sdk/lib/state_machine.js:26:10
Oct 16 03:00:33 at Request.<anonymous> (/home/yellowtent/box/node_modules/aws-sdk/lib/request.js:38:9)
Oct 16 03:00:33 at Request.<anonymous> (/home/yellowtent/box/node_modules/aws-sdk/lib/request.js:688:12)
Oct 16 03:00:33 at Request.callListeners (/home/yellowtent/box/node_modules/aws-sdk/lib/sequential_executor.js:116:18) {
Oct 16 03:00:33 code: 400,
Oct 16 03:00:33 region: null,
Oct 16 03:00:33 time: 2025-10-16T01:00:34.559Z,
Oct 16 03:00:33 requestId: null,
Oct 16 03:00:33 extendedRequestId: undefined,
Oct 16 03:00:33 cfId: undefined,
Oct 16 03:00:33 statusCode: 400,
Oct 16 03:00:33 retryable: false,
Oct 16 03:00:33 retryDelay: 20000
Oct 16 03:00:33 }
Oct 16 03:00:33
Oct 16 03:00:33 Node.js v20.18.0
Oct 16 03:00:34 box:shell backuptask: /usr/bin/sudo -S -E --close-from=4 /home/yellowtent/box/src/scripts/backupupload.js snapshot/app_da39dd94-29b5-4049-9aa5-76864ebc4608 tgz {"localRoot":"/home/yellowtent/appsdata/da39dd94-29b5-4049-9aa5-76864ebc4608","layout":[]} errored BoxError: backuptask exited with code 1 signal null
Oct 16 03:00:34 at ChildProcess.<anonymous> (/home/yellowtent/box/src/shell.js:137:19)
Oct 16 03:00:34 at ChildProcess.emit (node:events:519:28)
Oct 16 03:00:34 at ChildProcess.emit (node:domain:488:12)
Oct 16 03:00:34 at ChildProcess._handle.onexit (node:internal/child_process:294:12) {
Oct 16 03:00:34 reason: 'Shell Error',
Oct 16 03:00:34 details: {},
Oct 16 03:00:34 code: 1,
Oct 16 03:00:34 signal: null
Oct 16 03:00:34 }
Oct 16 03:00:34 box:backuptask runBackupUpload: backuptask crashed BoxError: backuptask exited with code 1 signal null
Oct 16 03:00:34 at ChildProcess.<anonymous> (/home/yellowtent/box/src/shell.js:137:19)
Oct 16 03:00:34 at ChildProcess.emit (node:events:519:28)
Oct 16 03:00:34 at ChildProcess.emit (node:domain:488:12)
Oct 16 03:00:34 at ChildProcess._handle.onexit (node:internal/child_process:294:12) {
Oct 16 03:00:34 reason: 'Shell Error',
Oct 16 03:00:34 details: {},
Oct 16 03:00:34 code: 1,
Oct 16 03:00:34 signal: null
Oct 16 03:00:34 }

[joseph]

@CaeruleusAqua which S3 provider are you using?

[james]

Marking as solved due to inactivity.