Solution
Thanks to PitaJ I have the solution for anyone else who encounters this problem. Make sure the url in the conf.json is correct. Also make sure that the ip adress is prefixed with http://
my A server install nodebb with redis, now i want install nodebb on B server with mongodb,how to import database to mongodb from A server's redis.
who can help me
Please contact NodeBB Inc.
https://community.nodebb.org/topic/8055/nodebb-redis-for-production/3
my nodebb just have less data,i can not bear this price .
i think i shoule use redis continue.
Thanks a lot