Can't continue upload, session expired. Please, start upload again. [403]

I am having an issue when trying to upload files i receive a 403 : Can’t continue upload, session expired. Please, start upload again. [403]

Meteor-files 2.0.1 Meteor 2.1

Cannot reproduce on localhost (working fine on development)

Server logs

3577|demo  | 2021-03-15 09:18 +01:00: [FilesCollection] [File Start HTTP] file.pdf - xvbNMxEdkxymmuFWE
3577|demo  | 2021-03-15 09:18 +01:00: [FilesCollection] [Upload] [HTTP Start Method] Got #-1/3 chunks, dst: file.pdf
3577|demo  | 2021-03-15 09:18 +01:00: [FilesCollection] [Upload] [HTTP] Got #1/3 chunks, dst: file.pdf
3577|demo  | 2021-03-15 09:18 +01:00: [FilesCollection] [Upload] [HTTP] Got #2/3 chunks, dst: file.pdf
3577|demo  | 2021-03-15 09:18 +01:00: [FilesCollection] [Abort Method]: xvbNMxEdkxymmuFWE - /home/apps/demo/uploads/rKUploads/xvbNMxEdkxymmuFWE.pdf
3577|demo  | 2021-03-15 09:18 +01:00: [FilesCollection] [remove({"_id":"xvbNMxEdkxymmuFWE"})]
3577|demo  | 2021-03-15 09:18 +01:00: [FilesCollection] [unlink(xvbNMxEdkxymmuFWE, undefined)]
3577|demo  | 2021-03-15 09:18 +01:00: [FilesCollection] [_preCollectionCursor.observe] [removed]: xvbNMxEdkxymmuFWE
3577|demo  | 2021-03-15 09:18 +01:00: [FilesCollection] [_preCollectionCursor.observe] [removeUnfinishedUpload]: xvbNMxEdkxymmuFWE

Client logs

The error occurs on different servers (Our application is deployed on different servers i.e. we have multiple independent apps on multiple servers and the error is the same) This was working fine for a long time. We recently changed some settings in cloudflare (I don’t know if this is a hint)

Thanks for your help.

[dokithonon]

Thanks for your help on the phone. We solved the problem by adding a cloudflare rule :

[dokithonon]

I see a 408 (as you mentioned before).

I received a 403. Strange. There might be something with the caching of cloudflare ?