Can't sync my owncloud with Windows Desktop client

Steps to reproduce
1. install fresh owncloud on cpanel latest server
2.run the Setup with mysql db
3.try to connect by the acctual web client

Expected behaviour
Tell us what should happen
i shoud be able to sync with the owncloud host

Actual behaviour
Tell us what happens instead
i got the message Verbindung beendet / Connection closed

Client configuration
Client version:2.24 6408
Client operating system: win10

Server configuration
Operating system: centos 7.2
Web server: Apache
Database: mysql
PHP version: 5.6
ownCloud version (see ownCloud admin page):
Updated from an older ownCloud or fresh install:fresh
Special configurations (external storage, external authentication, reverse proxy, server-side-encryption):

ownCloud log (data/owncloud.log)

Please paste possible errors in the following code block, see https://central.owncloud.org/t/how-to-find-webserver-or-oc-logfile-enable-php-logfile/808 for more info

{"reqId":"WBhgotaQ8rjNkU4ne5e9HwAAAFg","remoteAddr":"31.10.147.252","app":"mysql.setup","message":"Specific user creation failed: An exception occurred while executing 'SELECT user FROM mysql.user WHERE user=?' with params [\"oc_admin\"]:\n\nSQLSTATE[42000]: Syntax error or access violation: 1142 SELECT command denied to user 'sharebbb_ownclou'@'localhost' for table 'user'","level":3,"time":"2016-11-01T09:30:10+00:00","method":"POST","url":"\/owncloud\/index.php","user":"--"}
{"reqId":"WBhgotaQ8rjNkU4ne5e9HwAAAFg","remoteAddr":"31.10.147.252","app":"mysql.setup","message":"Database creation failed: An exception occurred while executing 'GRANT ALL PRIVILEGES ON `sharebbb_owncloud` . * TO 'sharebbb_ownclou'':\n\nSQLSTATE[42000]: Syntax error or access violation: 1044 Access denied for user 'sharebbb_ownclou'@'localhost' to database 'sharebbb_owncloud'","level":3,"time":"2016-11-01T09:30:10+00:00","method":"POST","url":"\/owncloud\/index.php","user":"--"}
{"reqId":"WBiJqG6W1iYSzaII7QOtlAAAAM0","remoteAddr":"31.10.147.252","app":"webdav","message":"Exception: {\"Message\":\"HTTP\\\/1.1 405 The resource you tried to create already exists\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\MethodNotAllowed\",\"Code\":0,\"Trace\":\"#0 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(588): Sabre\\\\DAV\\\\Server->createCollection('Marcos Ordner', Object(Sabre\\\\DAV\\\\MkCol))\\n#1 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpMkcol(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#2 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#3 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(459): Sabre\\\\Event\\\\EventEmitter->emit('method:MKCOL', Array)\\n#4 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(248): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#5 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(56): Sabre\\\\DAV\\\\Server->exec()\\n#6 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/remote.php(164): require_once('\\\/home\\\/sharebbba...')\\n#7 {main}\",\"File\":\"\\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":1121,\"User\":\"admin\"}","level":4,"time":"2016-11-01T12:25:13+00:00","method":"MKCOL","url":"\/owncloud\/remote.php\/webdav\/Marcos%20Ordner","user":"admin"}
{"reqId":"WBiJvogISw9kvyhyKvj-JgAAAA4","remoteAddr":"31.10.147.252","app":"webdav","message":"Exception: {\"Message\":\"HTTP\\\/1.1 405 The resource you tried to create already exists\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\MethodNotAllowed\",\"Code\":0,\"Trace\":\"#0 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(588): Sabre\\\\DAV\\\\Server->createCollection('Pascals Ordner', Object(Sabre\\\\DAV\\\\MkCol))\\n#1 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpMkcol(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#2 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#3 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(459): Sabre\\\\Event\\\\EventEmitter->emit('method:MKCOL', Array)\\n#4 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(248): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#5 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(56): Sabre\\\\DAV\\\\Server->exec()\\n#6 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/remote.php(164): require_once('\\\/home\\\/sharebbba...')\\n#7 {main}\",\"File\":\"\\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":1121,\"User\":\"admin\"}","level":4,"time":"2016-11-01T12:25:34+00:00","method":"MKCOL","url":"\/owncloud\/remote.php\/webdav\/Pascals%20Ordner","user":"admin"}
{"reqId":"WBiJyCvV9F6Y8qNPBPc0tAAAAFQ","remoteAddr":"31.10.147.252","app":"webdav","message":"Exception: {\"Message\":\"HTTP\\\/1.1 405 The resource you tried to create already exists\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\MethodNotAllowed\",\"Code\":0,\"Trace\":\"#0 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(588): Sabre\\\\DAV\\\\Server->createCollection('Philips Ordner', Object(Sabre\\\\DAV\\\\MkCol))\\n#1 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpMkcol(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#2 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#3 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(459): Sabre\\\\Event\\\\EventEmitter->emit('method:MKCOL', Array)\\n#4 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(248): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#5 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(56): Sabre\\\\DAV\\\\Server->exec()\\n#6 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/remote.php(164): require_once('\\\/home\\\/sharebbba...')\\n#7 {main}\",\"File\":\"\\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":1121,\"User\":\"admin\"}","level":4,"time":"2016-11-01T12:25:44+00:00","method":"MKCOL","url":"\/owncloud\/remote.php\/webdav\/Philips%20Ordner","user":"admin"}
{"reqId":"WBiKLm6W1iYSzaII7QOuIQAAANI","remoteAddr":"31.10.147.252","app":"webdav","message":"Exception: {\"Message\":\"HTTP\\\/1.1 405 The resource you tried to create already exists\",\"Exception\":\"Sabre\\\\DAV\\\\Exception\\\\MethodNotAllowed\",\"Code\":0,\"Trace\":\"#0 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/CorePlugin.php(588): Sabre\\\\DAV\\\\Server->createCollection('SBB P\\\\xC3\\\\xBCnten', Object(Sabre\\\\DAV\\\\MkCol))\\n#1 [internal function]: Sabre\\\\DAV\\\\CorePlugin->httpMkcol(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#2 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/event\\\/lib\\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\\n#3 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(459): Sabre\\\\Event\\\\EventEmitter->emit('method:MKCOL', Array)\\n#4 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php(248): Sabre\\\\DAV\\\\Server->invokeMethod(Object(Sabre\\\\HTTP\\\\Request), Object(Sabre\\\\HTTP\\\\Response))\\n#5 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/apps\\\/dav\\\/appinfo\\\/v1\\\/webdav.php(56): Sabre\\\\DAV\\\\Server->exec()\\n#6 \\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/remote.php(164): require_once('\\\/home\\\/sharebbba...')\\n#7 {main}\",\"File\":\"\\\/home\\\/sharebbbaumanage\\\/public_html\\\/owncloud\\\/3rdparty\\\/sabre\\\/dav\\\/lib\\\/DAV\\\/Server.php\",\"Line\":1121,\"User\":\"admin\"}","level":4,"time":"2016-11-01T12:27:27+00:00","method":"MKCOL","url":"\/owncloud\/remote.php\/webdav\/SBB%20P%C3%BCnten","user":"admin"}

{"reqId":"WBhgotaQ8rjNkU4ne5e9HwAAAFg","remoteAddr":"31.10.147.252","app":"mysql.setup","message":"Specific user creation failed: An exception occurred while executing 'SELECT user FROM mysql.user WHERE user=?' with params [\"oc_admin\"]:\n\nSQLSTATE[42000]: Syntax error or access violation: 1142 SELECT command denied to user 'sharebbb_ownclou'@'localhost' for table 'user'","level":3,"time":"2016-11-01T09:30:10+00:00","method":"POST","url":"\/owncloud\/index.php","user":"--"}
{"reqId":"WBhgotaQ8rjNkU4ne5e9HwAAAFg","remoteAddr":"31.10.147.252","app":"mysql.setup","message":"Database creation failed: An exception occurred while executing 'GRANT ALL PRIVILEGES ON sharebbb_owncloud . * TO 'sharebbb_ownclou'':\n\nSQLSTATE[42000]: Syntax error or access violation: 1044 Access denied for user 'sharebbb_ownclou'@'localhost' to database 'sharebbb_owncloud'","level":3,"time":"2016-11-01T09:30:10+00:00","method":"POST","url":"\/owncloud\/index.php","user":"--"}
{"reqId":"WBiJqG6W1iYSzaII7QOtlAAAAM0","remoteAddr":"31.10.147.252","app":"webdav","message":"Exception: {\"Message\":\"HTTP\\/1.1 405 The resource you tried to create already exists\",\"Exception\":\"Sabre\\DAV\\Exception\\MethodNotAllowed\",\"Code\":0,\"Trace\":\"#0 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/CorePlugin.php(588): Sabre\\DAV\\Server->createCollection('Marcos Ordner', Object(Sabre\\DAV\\MkCol))\n#1 [internal function]: Sabre\\DAV\\CorePlugin->httpMkcol(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#2 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/event\\/lib\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#3 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php(459): Sabre\\Event\\EventEmitter->emit('method:MKCOL', Array)\n#4 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php(248): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#5 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/apps\\/dav\\/appinfo\\/v1\\/webdav.php(56): Sabre\\DAV\\Server->exec()\n#6 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/remote.php(164): require_once('\\/home\\/sharebbba...')\n#7 {main}\",\"File\":\"\\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php\",\"Line\":1121,\"User\":\"admin\"}","level":4,"time":"2016-11-01T12:25:13+00:00","method":"MKCOL","url":"\/owncloud\/remote.php\/webdav\/Marcos%20Ordner","user":"admin"}
{"reqId":"WBiJvogISw9kvyhyKvj-JgAAAA4","remoteAddr":"31.10.147.252","app":"webdav","message":"Exception: {\"Message\":\"HTTP\\/1.1 405 The resource you tried to create already exists\",\"Exception\":\"Sabre\\DAV\\Exception\\MethodNotAllowed\",\"Code\":0,\"Trace\":\"#0 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/CorePlugin.php(588): Sabre\\DAV\\Server->createCollection('Pascals Ordner', Object(Sabre\\DAV\\MkCol))\n#1 [internal function]: Sabre\\DAV\\CorePlugin->httpMkcol(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#2 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/event\\/lib\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#3 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php(459): Sabre\\Event\\EventEmitter->emit('method:MKCOL', Array)\n#4 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php(248): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#5 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/apps\\/dav\\/appinfo\\/v1\\/webdav.php(56): Sabre\\DAV\\Server->exec()\n#6 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/remote.php(164): require_once('\\/home\\/sharebbba...')\n#7 {main}\",\"File\":\"\\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php\",\"Line\":1121,\"User\":\"admin\"}","level":4,"time":"2016-11-01T12:25:34+00:00","method":"MKCOL","url":"\/owncloud\/remote.php\/webdav\/Pascals%20Ordner","user":"admin"}
{"reqId":"WBiJyCvV9F6Y8qNPBPc0tAAAAFQ","remoteAddr":"31.10.147.252","app":"webdav","message":"Exception: {\"Message\":\"HTTP\\/1.1 405 The resource you tried to create already exists\",\"Exception\":\"Sabre\\DAV\\Exception\\MethodNotAllowed\",\"Code\":0,\"Trace\":\"#0 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/CorePlugin.php(588): Sabre\\DAV\\Server->createCollection('Philips Ordner', Object(Sabre\\DAV\\MkCol))\n#1 [internal function]: Sabre\\DAV\\CorePlugin->httpMkcol(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#2 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/event\\/lib\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#3 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php(459): Sabre\\Event\\EventEmitter->emit('method:MKCOL', Array)\n#4 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php(248): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#5 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/apps\\/dav\\/appinfo\\/v1\\/webdav.php(56): Sabre\\DAV\\Server->exec()\n#6 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/remote.php(164): require_once('\\/home\\/sharebbba...')\n#7 {main}\",\"File\":\"\\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php\",\"Line\":1121,\"User\":\"admin\"}","level":4,"time":"2016-11-01T12:25:44+00:00","method":"MKCOL","url":"\/owncloud\/remote.php\/webdav\/Philips%20Ordner","user":"admin"}
{"reqId":"WBiKLm6W1iYSzaII7QOuIQAAANI","remoteAddr":"31.10.147.252","app":"webdav","message":"Exception: {\"Message\":\"HTTP\\/1.1 405 The resource you tried to create already exists\",\"Exception\":\"Sabre\\DAV\\Exception\\MethodNotAllowed\",\"Code\":0,\"Trace\":\"#0 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/CorePlugin.php(588): Sabre\\DAV\\Server->createCollection('SBB P\\xC3\\xBCnten', Object(Sabre\\DAV\\MkCol))\n#1 [internal function]: Sabre\\DAV\\CorePlugin->httpMkcol(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#2 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/event\\/lib\\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#3 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php(459): Sabre\\Event\\EventEmitter->emit('method:MKCOL', Array)\n#4 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php(248): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#5 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/apps\\/dav\\/appinfo\\/v1\\/webdav.php(56): Sabre\\DAV\\Server->exec()\n#6 \\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/remote.php(164): require_once('\\/home\\/sharebbba...')\n#7 {main}\",\"File\":\"\\/home\\/sharebbbaumanage\\/public_html\\/owncloud\\/3rdparty\\/sabre\\/dav\\/lib\\/DAV\\/Server.php\",\"Line\":1121,\"User\":\"admin\"}","level":4,"time":"2016-11-01T12:27:27+00:00","method":"MKCOL","url":"\/owncloud\/remote.php\/webdav\/SBB%20P%C3%BCnten","user":"admin"}

Hi,

a first starting point is the following FAQ about such WebDAV issues. It happens quite often that the webservers or environment configuration is messing around with the WebDAV interface of ownCloud causing such issues:

This sounds like a problem with your mysql DB configuration or ownCloud's config.php?

IIRC these are showing up in the logfiles during the installation if a wrong user for the database is used and it doesn't look like related to the issue itself.