receiveLoop exiting with WebSocket error

helllo,My server have to network card, one link to internet, and another link to company network.I install couchbase server 5.0 beta and sync_gateway 1.5 beta on this server. when I watch the sync_gateway_error.log file, often prompt a errer message below( is my company ipadress):
**I | receiveLoop exiting with WebSocket error: read tcp> read: network is unreachable.
how can I resolve this issue?
thank you.

I think if my server have tow network card interface,one link to internet,and one to link local networks, but when the couchbase server return the response data from local networks,this error will thorws.
and how can I assign the websocket response only through the internet network card?
who can help me?