python consumer send request to provider, the provider can reciver the request correct but the consumer can not reciver response

DEBUG:python-dubbo:Current IP Address: 192.168.1.128
DEBUG:python-dubbo:Create consumer {'methods': u'sayHello', 'timestamp': 1549863219591L, 'pid': 17308, 'connected': 'true', 'interface': u'com.xiaoze.api.service.DemoService', 'check': 'false', 'category': 'consumers', 'dubbo': u'2.6.2', 'application': 'search_platform', 'version': u'1.0.0', 'side': 'consumer', 'revision': u'1.0.0'}
DEBUG:kazoo.client:Sending request(xid=3): Exists(path='/dubbo/com.xiaoze.api.service.DemoService/consumers', watcher=None)
DEBUG:kazoo.client:Received response(xid=3): ZnodeStat(czxid=753, mzxid=753, ctime=1549852990368L, mtime=1549852990368L, version=0, cversion=87, aversion=0, ephemeralOwner=0, dataLength=0, numChildren=1, pzxid=910)
DEBUG:kazoo.client:Sending request(xid=4): Create(path='/dubbo/com.xiaoze.api.service.DemoService/consumers/consumer%3A%2F%2F192.168.1.128%2Fcom.xiaoze.api.service.DemoService%3Fapplication%3Dsearch_platform%26category%3Dconsumers%26check%3Dfalse%26connected%3Dtrue%26dubbo%3D2.6.2%26interface%3Dcom.xiaoze.api.service.DemoService%26methods%3DsayHello%26pid%3D17308%26revision%3D1.0.0%26side%3Dconsumer%26timestamp%3D1549863219591%26version%3D1.0.0', data='', acl=[ACL(perms=31, acl_list=['ALL'], id=Id(scheme='world', id='anyone'))], flags=1)
DEBUG:kazoo.client:Sending request(xid=5): GetChildren(path='/dubbo/com.xiaoze.api.service.DemoService/configurators', watcher=>)
DEBUG:kazoo.client:Received response(xid=4): u'/dubbo/com.xiaoze.api.service.DemoService/consumers/consumer%3A%2F%2F192.168.1.128%2Fcom.xiaoze.api.service.DemoService%3Fapplication%3Dsearch_platform%26category%3Dconsumers%26check%3Dfalse%26connected%3Dtrue%26dubbo%3D2.6.2%26interface%3Dcom.xiaoze.api.service.DemoService%26methods%3DsayHello%26pid%3D17308%26revision%3D1.0.0%26side%3Dconsumer%26timestamp%3D1549863219591%26version%3D1.0.0'
DEBUG:kazoo.client:Received response(xid=5): []
DEBUG:python-dubbo:Start request, host=192.168.56.1:20880, params={'path': 'com.xiaoze.api.service.DemoService', 'version': '1.0.0', 'dubbo_version': '2.4.10', 'method': 'sayHello', 'arguments': ['A000000']}
DEBUG:python-dubbo:Waiting response, invoke_id=0, timeout=60000, host=192.168.56.1:20880
DEBUG:python-dubbo:Send ❤ request for invoke_id 1, host=192.168.56.1:20880
DEBUG:python-dubbo:Send ❤ request for invoke_id 2, host=192.168.56.1:20880
DEBUG:python-dubbo:Send ❤ request for invoke_id 3, host=192.168.56.1:20880
DEBUG:python-dubbo:192.168.56.1:20880 closed by client.
DEBUG:python-dubbo:192.168.56.1:20880 timeout and reconnected by client.
DEBUG:python-dubbo:Send ❤ request for invoke_id 4, host=192.168.56.1:20880
DEBUG:python-dubbo:Send ❤ request for invoke_id 5, host=192.168.56.1:20880
DEBUG:python-dubbo:Send ❤ request for invoke_id 6, host=192.168.56.1:20880
DEBUG:python-dubbo:192.168.56.1:20880 closed by client.