Collabora dns problem

i use collabora docker container in an ubuntu plesk environment. My NC15 Server named cloud mydomain com and special subdomain for collabora office mydomain com. Both are working and i can reach admin console with /loleaflet/dist/admin/admin.html.

If I try to open an document at cloud server i see this error message at docker log:

wsd-00030-00050 2019-02-22 09:41:51.425681 [ docbroker_003 ] ERR Cannot get file info from WOPI storage uri [https:// cloud. mydomain. com/index.php/apps/richdocuments/wopi/files/1297_oc5oi872suei?access_token=0okpovGVo0L1JqyXnPhABudfdGLzW1ONTR&access_token_ttl=0&permission=edit]. Error: DNS error: Temporary DNS error while resolving: cloud. mydomain. com | wsd/Storage.cpp:474
wsd-00030-00050 2019-02-22 09:41:51.425979 [ docbroker_003 ] ERR Failed to add session to [/index.php/apps/richdocuments/wopi/files/1297_oc5oi873suei] with URI [https:// cloud. mydomain. com /index.php/apps/richdocuments/wopi/files/1297_oc5oi873suei?access_token=0okpovGVo0L1JqyXnPhABudfdGLzW1ONTR&access_token_ttl=0&permission=edit]: DNS error| wsd/DocumentBroker.cpp:1091
wsd-00030-00050 2019-02-22 09:41:51.426058 [ docbroker_003 ] ERR Error while loading : DNS error| wsd/LOOLWSD.cpp:2674
wsd-00030-00050 2019-02-22 09:41:51.426496 [ docbroker_003 ] WRN Child session [0038] not found to forward message: load url= readonly=0 lang=de-de| wsd/DocumentBroker.cpp:1736
kit-00047-00032 2019-02-22 09:41:52.427741 [ loolkit ] WRN Kit connection lost without exit arriving from wsd. Setting TerminationFlag| kit/Kit.cpp:2218
wsd-00030-00050 2019-02-22 09:41:52.427846 [ docbroker_003 ] ERR Invalid or unknown session [0038] to remove.| wsd/DocumentBroker.cpp:1160
wsd-00030-00050 2019-02-22 09:41:52.427892 [ docbroker_003 ] ERR No socket associated with WebSocketHandler 0x7f747c018060| ./net/WebSocketHandler.hpp:108
wsd-00030-00031 2019-02-22 09:41:55.732386 [ prisoner_poll ] WRN Prisoner connection disconnected but without valid socket.| wsd/LOOLWSD.cpp:1776

Docker conainer has this parameter settings:

Any idea why i have dns problems?

Annotation: I put some space into URLs above, because the editor allows not too much links

I fixed it by myself.
I rebuild the container again and removed the Proxy Rules for subdomain Checked also no php is activated in subdomain.