Could not rename part file to final file (WebDav external storage)

Hello,
My NC13 site has several extarnal webdav storages. My user reported the error as subject. unable to update any file. And I (admin) reproduced same error unable to update. Another Webdav storage mounted works fine. Log is as following.

{
“app”: “webdav”,
“level”: 4,
“message”: “Exception: {“Exception”:“Sabre\DAV\Exception”,“Message”:“Could not rename part file to final file”,“Code”:0,“Trace”:”#0 /home/ApacheDoc/ncsk/3rdparty/sabre/dav/lib/DAV/Server.php(1130): OCA\DAV\Connector\Sabre\File->put(Resource id #21)\n#1 /home/ApacheDoc/ncsk/3rdparty/sabre/dav/lib/DAV/CorePlugin.php(513): Sabre\DAV\Server->updateFile(‘ffiles/\xE8\xA4\x87\xE5\x90\x88\xE8\xBC…’, Resource id #21, NULL)\n#2 [internal function]: Sabre\DAV\CorePlugin->httpPut(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))\n#3 /home/ApacheDoc/ncsk/3rdparty/sabre/event/lib/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#4 /home/ApacheDoc/ncsk/3rdparty/sabre/dav/lib/DAV/Server.php(479): Sabre\Event\EventEmitter->emit(‘method:PUT’, Array)\n#5 /home/ApacheDoc/ncsk/3rdparty/sabre/dav/lib/DAV/Server.php(254): Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))\n#6 /home/ApacheDoc/ncsk/apps/dav/appinfo/v1/webdav.php(80): Sabre\DAV\Server->exec()\n#7 /home/ApacheDoc/ncsk/remote.php(164): require_once(’/home/ApacheDoc…’)\n#8 {main}",“File”:"/home/ApacheDoc/ncsk/apps/dav/lib/Connector/Sabre/File.php",“Line”:215}",
“method”: “PUT”,
“remoteAddr”: “???”,
“reqId”: “WsLX2xQ3D@e9t1BZgExDFQAAAAo”,
“time”: “2018-04-03T10:24:54+09:00”,
“url”: “/ncsk/remote.php/webdav/ffiles/%E8%A4%87%E5%90%88%E8%BC%B8%E9%80%81%E5%96%B6%E6%A5%AD%E6%89%80%E3%80%80%E5%85%B1%E9%80%9A%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB%E3%80%802009.04-/%E5%BC%95%E7%B6%99%E6%9B%B8%E3%80%802009.04-/%E4%B8%80%E8%88%AC%E8%8D%B7%E4%B8%BB%E9%96%A2%E9%80%A3/%E8%BC%B8%E5%87%BA/%E4%B8%89%E8%8F%B1%E5%95%86%E4%BA%8B/%E9%95%B7%E8%B0%B7%E5%B7%9D%E6%A7%98%E3%80%81%E5%9C%8B%E5%8F%B8%E6%A7%98%E3%80%80%E3%80%80%E3%80%80%20%E5%BE%AE%E7%B2%92%E5%AD%90%E9%85%B8%E5%8C%96%E3%83%81%E3%82%BF%E3%83%B3/%E9%80%9A%E9%96%A2%E6%9B%B8%E9%A1%9E%E4%BD%9C%E6%88%90%2C%20ISF%20%20%E9%85%B8%E5%8C%96%E3%83%81%E3%82%BF%E3%83%B3/NHAVA%20SHEVA/NHAVA%20SHEVA%E5%90%91%E3%81%91%E3%80%8017U9161%20B’PARAS-4%20FCL%20MP-40%2CMT-100Z%2CMT-100AQ%2CMT-700Z.xls”,
“user”: “???”,
“userAgent”: “Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko”,
“version”: “13.0.0.14”
}

The problem storage server is private connected by another web server (reverse proxy). Is there a relationship ? Cause of a long long file name, I renamed shortly, but occured same error.
If other information is required, I will show.

I do not know why, but I solved.
I think maybe problem since the external storage server has run out of specifications ,
(CentOS 6.9, Apache 2.2, Celeron dual core CPU)
The WebDav server usinag as external storage is due to be migrated to new server.
(CentOS 7.4 Apache 2.4 Xeon 4C8T)
After configuring WebDav on the new server and trying it on external storage, I uploaded files without problems.