Hello Karthik, You can check the hosts file inside etc directory.There may be two entries for the localhost 127.0.0.1 and 127.0.0.1::1.You an try commenting the latter one.It is possible that IPv6 is turned on and it is resolving localhost to the ::1 address .Since the port 3000 is currently active hence the connection can't be established message might be appearing.
Cheers, Varun :) [Non-text portions of this message have been removed]
