Homematic & docker

Hello all,

currently I try to use Openhab in a Docker container but is seems i have a network problem with the Homematic Binding.

Example from the homematic ccu2 log

May  3 20:57:57 homematic-ccu2 user.err rfd: XmlRpc transport error calling system.listMethods({"RF-5e6cc2f0"}) on binary://192.168.0.81:9126/RPC2:
May  3 20:57:57 homematic-ccu2 user.err rfd: XmlRpc transport error calling listDevices({"RF-5e6cc2f0"}) on binary://192.168.0.81:9126/RPC2:
May  3 20:58:20 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","KEQ0242031:1","TEMPERATURE",24.300000}],[methodName:"event",params:{"RF-5e6cc2f0","KEQ0242031:1","HUMIDITY",45}]}) on binary://192.168.0.81:9126/RPC2:
May  3 20:58:20 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 20:58:28 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","KEQ0175012:1","TEMPERATURE",23.700000}],[methodName:"event",params:{"RF-5e6cc2f0","KEQ0175012:1","HUMIDITY",47}]}) on binary://192.168.0.81:9126/RPC2:
May  3 20:58:28 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 20:58:49 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549393:4","CONTROL_MODE",1}],[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549393:4","FAULT_REPORTING",0}],[methodName:"event",params:{"RF-5e6cc2f0"
May  3 20:58:49 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 20:58:49 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549393:4","VALVE_STATE",0}]}) on binary://192.168.0.81:9126/RPC2:
May  3 20:58:49 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 20:58:49 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549393:4","BOOST_STATE",0}]}) on binary://192.168.0.81:9126/RPC2:
May  3 20:58:49 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 20:58:49 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549393:4","ACTUAL_TEMPERATURE",17.100000}],[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549393:4","SET_TEMPERATURE",4.500000}],[methodName:"event",
May  3 20:58:49 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 20:59:07 homematic-ccu2 user.err rfd: XmlRpc transport error calling system.listMethods({"RF-5e6cc2f0"}) on binary://192.168.0.81:9126/RPC2:
May  3 20:59:07 homematic-ccu2 user.err rfd: XmlRpc transport error calling listDevices({"RF-5e6cc2f0"}) on binary://192.168.0.81:9126/RPC2:
May  3 20:59:37 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549449:4","CONTROL_MODE",1}],[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549449:4","FAULT_REPORTING",0}]}) on binary://192.168.0.81:9126/RPC2:
May  3 20:59:37 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 20:59:38 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549449:4","BATTERY_STATE",2.900000}]}) on binary://192.168.0.81:9126/RPC2:
May  3 20:59:38 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 20:59:38 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549449:4","VALVE_STATE",0}]}) on binary://192.168.0.81:9126/RPC2:
May  3 20:59:38 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 20:59:38 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549449:4","BOOST_STATE",0}]}) on binary://192.168.0.81:9126/RPC2:
May  3 20:59:38 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 20:59:38 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549449:4","ACTUAL_TEMPERATURE",14.900000}],[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549449:4","SET_TEMPERATURE",4.500000}],[methodName:"event",
May  3 20:59:38 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 21:00:06 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549450:4","CONTROL_MODE",1}],[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549450:4","FAULT_REPORTING",0}],[methodName:"event",params:{"RF-5e6cc2f0"
May  3 21:00:06 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 21:00:06 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549450:4","PARTY_START_TIME",0}],[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549450:4","PARTY_START_DAY",1}],[methodName:"event",params:{"RF-5e6cc
May  3 21:00:06 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 21:00:06 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549450:4","PARTY_START_YEAR",0}]}) on binary://192.168.0.81:9126/RPC2:
May  3 21:00:06 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 21:00:06 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549450:4","PARTY_STOP_TIME",0}]}) on binary://192.168.0.81:9126/RPC2:
May  3 21:00:06 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 21:00:06 homematic-ccu2 user.err rfd: XmlRpcClient error calling event({[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549450:4","PARTY_STOP_DAY",1}],[methodName:"event",params:{"RF-5e6cc2f0","MEQ0549450:4","PARTY_STOP_MONTH",1}],[methodName:"event",params:{"RF-5e6cc2
May  3 21:00:06 homematic-ccu2 user.err rfd: XmlRpc transport error
May  3 21:00:17 homematic-ccu2 user.err rfd: XmlRpc transport error calling system.listMethods({"RF-5e6cc2f0"}) on binary://192.168.0.81:9126/RPC2:
May  3 21:00:17 homematic-ccu2 user.err rfd: XmlRpc transport error calling listDevices({"RF-5e6cc2f0"}) on binary://192.168.0.81:9126/RPC2:

CCU Software : 2.17.15 (downgraded from 2.27.8)
lastest Binding Version from PaperUI

Docker runs in a debian VM and is connected as bridge network with the DockerVM.

Do anyone have some experience or can help me?

I tried it also with a things file same behaviour.