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redis 127.0.0.1:6379> PING

# Normal connection between client and server

redis 127.0.0.1:6379> PING
PONG

# Abnormal connection between client and server (network issue or server not running properly)

redis 127.0.0.1:6379> PING
Could not connect to Redis at 127.0.0.1:6379: Connection refused