nodebb disconnect

[radish-angel]

every other 5 minutes，nodebb disconnect ，How can I solve it?

[baris]

Check logs/output.log for errors, check your browser console for errors, make sure you access the forum with the url you specified in config.json

[radish-angel]

every other 5 minutes, my browser console many errors, eg:
GET http://www.seenewyun.com/socket.io/?EIO=3&transport=polling&t=MOJNhdj 502 (Bad Gateway)
,but nodebb can auto connect.