Server :: Pipe 'echo' To 'netcat' - Sometime It Seems To Broken

I am running somes instances of Redis. I want to get Redis stats with following command:

Code:

$ echo "info" | nc <server_IP> <port>

but sometime it returns nothing. The first thing come to my mind is broken pipe or something like this. I always get the result if telnet to Redis and typing 'info' command. I also try pipe viewer to monitor the progress of data but it didn't help:

Code:

$ echo "info" | pv | nc <server_IP> <port>