DNS Error Collabora

Hello,

After some issues with my server all other Problems are fixed but I can’t connect to collabora. The settings are correct.

The docker logs show following:

docker logs 1e39fdd81e0e Generating RSA private key, 2048 bit long modulus .....+++ ...............................+++ e is 65537 (0x10001) Generating RSA private key, 2048 bit long modulus .............+++ ......+++ e is 65537 (0x10001) Signature ok subject=/C=DE/ST=BW/L=Stuttgart/O=Dummy Authority/CN=localhost Getting CA Private Key loolforkit version details: 2.0.3 - 2.0.3 wsd-00025-0026 13:17:43.688047 [ client_req_hdl ] WRN WOPI host did not pass optional access_token_ttl| wsd/FileServer.cpp:255 wsd-00025-0027 13:17:44.363248 [ client_ws_0001 ] WRN getNewChild: No available child. Sending spawn request to forkit and failing.| wsd/LOOLWSD.cpp:422 wsd-00025-0027 13:17:49.363406 [ client_ws_0001 ] WRN getNewChild: No available child. Sending spawn request to forkit and failing.| wsd/LOOLWSD.cpp:422 wsd-00025-0027 13:17:54.363650 [ client_ws_0001 ] WRN getNewChild: No available child. Sending spawn request to forkit and failing.| wsd/LOOLWSD.cpp:422 office version details: { "ProductName": "Collabora Office", "ProductVersion": "5.1", "ProductExtension": ".10.18", "BuildId": "586626676b0aa697e153c6693a1e1407f7746989" } wsd-00025-0027 13:18:54.938826 [ client_ws_0001 ] ERR Error in client request handler: DNS error| wsd/LOOLWSD.cpp:1038 wsd-00025-0029 14:18:17.965685 [ client_req_hdl ] WRN WOPI host did not pass optional access_token_ttl| wsd/FileServer.cpp:255 wsd-00025-3002 14:19:19.621507 [ client_ws_0004 ] ERR Error in client request handler: DNS error| wsd/LOOLWSD.cpp:1038 wsd-00025-3002 14:20:17.061884 [ client_ws_0005 ] ERR Error in client request handler: DNS error| wsd/LOOLWSD.cpp:1038 wsd-00025-3002 14:21:13.749882 [ client_ws_0006 ] ERR Error in client request handler: DNS error| wsd/LOOLWSD.cpp:1038

Why DNS Error? Maybe docker related and I must purge and reinstall docker ?