It is recommended that you use Secure Shell (SSH) instead of Telnet.
Telnet is insecure by nature as it sends all traffic across the wire in clear text.
The command to disable Telnet is as follows\n
ProCurve Switch(config)# no telnet-server\n
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: Configuration Management.This control applies to the following type of system HPProCurve.