Webdav not writeabl

Hi,

I've set up a fresh nginx which has to act as a webdav server.
I've added this virtualhost configuration:

server {
server_name dav.mydomain;

location / {
root /webdav/www;
client_body_temp_path /webdav/temp;

dav_methods PUT DELETE MKCOL COPY MOVE;
dav_ext_methods PROPFIND OPTIONS;

create_full_put_path on;
dav_access group:rw all:rw;

limit_except GET {
allow 192.168.1.0/32;
deny all;
}
}
}

I gave the permission 777 to /webdav/www and /webdav/temp

I can mount the webdav but write actions aren't possible... The following debug output is created when I try to create a new folder with windows:

2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:1 f:0 0000000000929C40, pos 0000000000929C40, size: 139 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 http write filter: l:0 f:0 s:139
2014/06/12 18:12:49 [debug] 6455#0: *8 http propfind path: "/webdav/www/Neuer Ordner"
2014/06/12 18:12:49 [debug] 6455#0: *8 http output filter "/Neuer Ordner?"
2014/06/12 18:12:49 [debug] 6455#0: *8 http copy filter: "/Neuer Ordner?"
2014/06/12 18:12:49 [debug] 6455#0: *8 image filter
2014/06/12 18:12:49 [debug] 6455#0: *8 xslt filter body
2014/06/12 18:12:49 [debug] 6455#0: *8 http postpone filter "/Neuer Ordner?" 0000000000929D50
2014/06/12 18:12:49 [debug] 6455#0: *8 http chunk: 71
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:1 f:0 0000000000929C40, pos 0000000000929C40, size: 139 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:1 f:0 0000000000929E40, pos 0000000000929E40, size: 4 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:0 f:0 00000000004CA7D8, pos 00000000004CA7D8, size: 71 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:0 f:0 0000000000000000, pos 00000000004C135D, size: 2 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 http write filter: l:0 f:0 s:216
2014/06/12 18:12:49 [debug] 6455#0: *8 http copy filter: 0 "/Neuer Ordner?"
2014/06/12 18:12:49 [alert] 6455#0: *8 dav_ext stat failed on '/webdav/www/Neuer Ordner' (2: No such file or directory), client: 212.6.65.181, server: dav.my-nethome.de, request: "PROPFIND /Neuer%20Ordner HTTP/1.1", host: "dav.my-nethome.de"
2014/06/12 18:12:49 [debug] 6455#0: *8 http output filter "/Neuer Ordner?"
2014/06/12 18:12:49 [debug] 6455#0: *8 http copy filter: "/Neuer Ordner?"
2014/06/12 18:12:49 [debug] 6455#0: *8 image filter
2014/06/12 18:12:49 [debug] 6455#0: *8 xslt filter body
2014/06/12 18:12:49 [debug] 6455#0: *8 http postpone filter "/Neuer Ordner?" 000000000092A1A0
2014/06/12 18:12:49 [debug] 6455#0: *8 http chunk: 21
2014/06/12 18:12:49 [debug] 6455#0: *8 http chunk: 15
2014/06/12 18:12:49 [debug] 6455#0: *8 http chunk: 32
2014/06/12 18:12:49 [debug] 6455#0: *8 http chunk: 25
2014/06/12 18:12:49 [debug] 6455#0: *8 http chunk: 4
2014/06/12 18:12:49 [debug] 6455#0: *8 http chunk: 13
2014/06/12 18:12:49 [debug] 6455#0: *8 http chunk: 40
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:1 f:0 0000000000929C40, pos 0000000000929C40, size: 139 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:1 f:0 0000000000929E40, pos 0000000000929E40, size: 4 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:0 f:0 00000000004CA7D8, pos 00000000004CA7D8, size: 71 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:0 f:0 0000000000000000, pos 00000000004C135D, size: 2 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:1 f:0 000000000092A2E0, pos 000000000092A2E0, size: 4 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:0 f:0 00000000004CA4D8, pos 00000000004CA4D8, size: 21 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:1 f:0 0000000000929F98, pos 0000000000929F98, size: 15 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:0 f:0 00000000004CA688, pos 00000000004CA688, size: 32 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:0 f:0 00000000004CA4EE, pos 00000000004CA4EE, size: 25 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:1 f:0 000000000092A0C8, pos 000000000092A0C8, size: 4 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:0 f:0 00000000004BF4B5, pos 00000000004BF4B5, size: 13 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:0 f:0 00000000004CA780, pos 00000000004CA780, size: 40 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:0 f:0 0000000000000000, pos 00000000004C135D, size: 2 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 http write filter: l:0 f:0 s:372
2014/06/12 18:12:49 [debug] 6455#0: *8 http copy filter: 0 "/Neuer Ordner?"
2014/06/12 18:12:49 [debug] 6455#0: *8 http output filter "/Neuer Ordner?"
2014/06/12 18:12:49 [debug] 6455#0: *8 http copy filter: "/Neuer Ordner?"
2014/06/12 18:12:49 [debug] 6455#0: *8 image filter
2014/06/12 18:12:49 [debug] 6455#0: *8 xslt filter body
2014/06/12 18:12:49 [debug] 6455#0: *8 http postpone filter "/Neuer Ordner?" 000000000092A448
2014/06/12 18:12:49 [debug] 6455#0: *8 http chunk: 17
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:1 f:0 0000000000929C40, pos 0000000000929C40, size: 139 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:1 f:0 0000000000929E40, pos 0000000000929E40, size: 4 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:0 f:0 00000000004CA7D8, pos 00000000004CA7D8, size: 71 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:0 f:0 0000000000000000, pos 00000000004C135D, size: 2 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:1 f:0 000000000092A2E0, pos 000000000092A2E0, size: 4 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:0 f:0 00000000004CA4D8, pos 00000000004CA4D8, size: 21 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:1 f:0 0000000000929F98, pos 0000000000929F98, size: 15 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:0 f:0 00000000004CA688, pos 00000000004CA688, size: 32 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:0 f:0 00000000004CA4EE, pos 00000000004CA4EE, size: 25 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:1 f:0 000000000092A0C8, pos 000000000092A0C8, size: 4 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:0 f:0 00000000004BF4B5, pos 00000000004BF4B5, size: 13 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:0 f:0 00000000004CA780, pos 00000000004CA780, size: 40 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write old buf t:0 f:0 0000000000000000, pos 00000000004C135D, size: 2 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:1 f:0 000000000092A4C8, pos 000000000092A4C8, size: 4 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:0 f:0 00000000004CA543, pos 00000000004CA543, size: 17 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 write new buf t:0 f:0 0000000000000000, pos 00000000004C1358, size: 7 file: 0, size: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 http write filter: l:1 f:0 s:400
2014/06/12 18:12:49 [debug] 6455#0: *8 http write filter limit 0
2014/06/12 18:12:49 [debug] 6455#0: *8 writev: 400
2014/06/12 18:12:49 [debug] 6455#0: *8 http write filter 0000000000000000
2014/06/12 18:12:49 [debug] 6455#0: *8 http copy filter: 0 "/Neuer Ordner?"
2014/06/12 18:12:49 [debug] 6455#0: *8 http finalize request: 0, "/Neuer Ordner?" a:1, c:2
2014/06/12 18:12:49 [debug] 6455#0: *8 http request count:2 blk:0
2014/06/12 18:12:49 [debug] 6455#0: *8 http finalize request: -4, "/Neuer Ordner?" a:1, c:1
2014/06/12 18:12:49 [debug] 6455#0: *8 set http keepalive handler
2014/06/12 18:12:49 [debug] 6455#0: *8 http close request
2014/06/12 18:12:49 [debug] 6455#0: *8 http log handler
2014/06/12 18:12:49 [debug] 6455#0: *8 http pinba handler
2014/06/12 18:12:49 [debug] 6455#0: *8 free: 000000000091CCE0, unused: 0
2014/06/12 18:12:49 [debug] 6455#0: *8 free: 0000000000929B90, unused: 1402
2014/06/12 18:12:49 [debug] 6455#0: *8 free: 0000000000930100
2014/06/12 18:12:49 [debug] 6455#0: *8 hc free: 0000000000000000 0
2014/06/12 18:12:49 [debug] 6455#0: *8 hc busy: 0000000000000000 0
2014/06/12 18:12:49 [debug] 6455#0: *8 reusable connection: 1
2014/06/12 18:12:49 [debug] 6455#0: *8 event timer add: 11: 65000:1402589634679
2014/06/12 18:12:49 [debug] 6455#0: *8 post event 0000000000968238
2014/06/12 18:12:49 [debug] 6455#0: *8 delete posted event 0000000000968238
2014/06/12 18:12:49 [debug] 6455#0: *8 http keepalive handler
2014/06/12 18:12:49 [debug] 6455#0: *8 malloc: 0000000000930100:1024
2014/06/12 18:12:49 [debug] 6455#0: *8 recv: fd:11 -1 of 1024
2014/06/12 18:12:49 [debug] 6455#0: *8 recv() not ready (11: Resource temporarily unavailable)
2014/06/12 18:12:49 [debug] 6455#0: *8 free: 0000000000930100

Any hints where I can have a look to fix this issue?

Greets
Sascha