The newly opened port of redis cannot be accessed normally from other machines (telnet fails)
netstat -an | grep custom port
tcp 0 0 127.0.0.1:custom port 0.0.0.0:* LISTEN
127.0.0.1 This needs to be modified from the redis configuration file
redis.conf
# IF YOU ARE SURE YOU WANT YOUR INSTANCE TO LISTEN TO ALL THE INTERFACES
# JUST COMMENT THE FOLLOWING LINE.
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#bind 127.0.0.1
Just comment out bind 127.0.0.1
restart redis
Take another look at netstat -an | grep custom port