SOLVED
Added
socket.io {"address": */*};Default "address:" **; that's is problem.
I tried running nodebb on apache but given I was running under a centos/whm server, it became a nightmare. Now i have nodebb running on Digitalocean but I still get this error like
https://coinassist.org/socket.io/?EIO=3&transport=polling&t=MBL7iKu
Is that normal?