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SendFile: Can't read from cache file, error=c0000022

I recently started working on a new server and writing many files I often get an upload error (1 in 20-50 files I'd say).

I connect via ftp using Webdrive 2017 build 4860 64bit.
My Os is Windows Seven 64.
Ftp passes over an OpenVpn channel.

The remote system is a Windows virtual machine (don't know what flavour) and the ftp server is Filezilla.

an excerpt of the log containing the error:

  

230 Logged on
SYST
215 UNIX emulated by FileZilla
FEAT
211-Features:
 MDTM
 REST STREAM
 SIZE
 MLST type*;size*;modify*;
 MLSD
 UTF8
 CLNT
 MFMT
 EPSV
 EPRT
211 End
OPTS UTF8 ON
202 UTF8 mode is always enabled. No need to send this command.
PWD
257 "/" is current directory.
MLST /folder/file.php
250-Listing /folder/file.php
 type=file;size=47993;modify=20171012155031; /folder/file.php
250 End
Resuming interrupted transfer at offset 47993
CWD /folder
250 CWD successful. "/folder" is current directory.
TYPE I
200 Type set to I
REST 0
350 Rest supported. Restarting at 0
PASV
227 Entering Passive Mode (10,101,9,54,243,232)
REST 47993
350 Rest supported. Restarting at 47993
STOR event.php
150 Opening data channel for file upload to server of "/folder/file.php", restarting at offset 47993
SendFile: Can't read from cache file, error=c0000022
Upload: sending file to server failed
Created a backup of file C:\TEMP\z\WebDrive\Cache\My_server\Files\File(3084)
Upload Failed
Unable to upload \folder\file.php Error= (0) 	A backup of this file has been created	
Update cache size from file change '\folder\file.php' Cache: 33.73 MB Subtract: 11 Bytes 

  As a result the remote file disappears.

My cache is set as follows:
cache files, expire after 43200
chache direcory listings, expire after 43200
flush cache files on connect
flush directory listings on connect
cache limit 11000 MB

Usually the cache is filled with few tens of MB

I used webdrive on many other (linux) servers with the same cache settings and have no problems. My local disk is fine and fit.

What is error c0000022  ?

Thank you

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