I am becoming bald from tearing my hair on this issue...
What we have :
SharePoint 2016 Farm with :
- WFE Server "web1"
- Application server "app1"
- SQL Server "sql"
- Site collections with subsites.
- Classic experience for all libraries. We tried to keep the url short thoughout each site collection (like sites/w/L1)
What is the issue :
When trying to upload a file via Web (in library, click on "+ Upload a document", browse and ok), it works, for file from 0 to 250 Mo. No big deal.
When trying to upload a file via File Explorer (in library, Library tab on ribbon, click on "Open in File explorer", and drag and drop from Desktop), the upload randomly fails. (I know uploading through File Explorer is not the advised way, but my users have to upload files by bulk. And sometimes, big files.)
It gives us this error :
Rough translation from french :
An unexpected error prevent you to copy this file. If the issue lasts, use the error code to search help on this error. Error 0x80070780 : system can't access to the file.
But the behavior is really strange and we do not reproduce it 100% of the times we try. It is randomly occuring for all users, for every site collection we tested it on. We get this error for lots of different files, from simple .txt file of 8octets to Word files of 100Mo.
We have tried a lot and can not reproduce the exact steps everytime.
What I tried
Tying to reproduce it to find the cause, but could not reproduce it faithfully. I tried to restart the WebClient service on my side, but it did nothing.
So, do you have any idea on how to solve the 0x80070780 error and allow my users to upload files from File Explorer?
Please help me with your science !