Hi @atom_yang
Following are some logs
2017-05-03T12:49:24.162Z HTTP: #4570: POST /embarkation/_changes?feed=normal&heartbeat=30000&style=all_docs&since=38439
2017-05-03T12:49:24.162Z Changes: MultiChangesFeed({}, {Since:38439 Limit:0 Conflicts:true IncludeDocs:false Wait:false Continuous:false Terminator:0xc42212f920 HeartbeatMs:30000 TimeoutMs:300000 ActiveOnly:false}) …
2017-05-03T12:49:24.162Z Changes: MultiChangesFeed done
2017-05-03T12:49:24.196Z HTTP: #4571: POST /embarkation/_changes?feed=longpoll&heartbeat=30000&style=all_docs&since=38439
2017-05-03T12:49:24.196Z Changes: MultiChangesFeed({}, {Since:38439 Limit:0 Conflicts:true IncludeDocs:false Wait:true Continuous:false Terminator:0xc4215a62a0 HeartbeatMs:30000 TimeoutMs:300000 ActiveOnly:false}) …
2017-05-03T12:44:53.881Z HTTP: #4260: POST /embarkation/_changes?feed=longpoll&heartbeat=30000&style=all_docs&since=38439&active_only=true
2017-05-03T12:44:53.882Z Changes: MultiChangesFeed({*}, {Since:38439 Limit:0 Conflicts:true IncludeDocs:false Wait:true Continuous:false Terminator:0xc4257ac780 HeartbeatMs:30000 TimeoutMs:300000 ActiveOnly:true}) …
2017-05-03T12:44:57.846Z Changes: Connection lost from client: (as GUEST)
2017-05-03T12:50:37.382Z HTTP: #4804: POST /embarkation/_changes?feed=longpoll&heartbeat=30000&style=all_docs&since=38439&active_only=true
2017-05-03T12:50:37.382Z Changes: MultiChangesFeed({*}, {Since:38439 Limit:0 Conflicts:true IncludeDocs:false Wait:true Continuous:false Terminator:0xc422e64000 HeartbeatMs:30000 TimeoutMs:300000 ActiveOnly:true}) …
It looks like Connection lost from client can be an issue?