GS110TUP enabling SNMP

Hello

Im very green with networking and could use some tips to enabling SNMP on GS110TUP.

Actually i thought SNMP was enabled by default, but when i try to send an SNMP command from linux i get following:

snmpwalk -v1 -c public 192.168.123.22

Timeout: No Response from 192.168.123.22

So i thought, ok, maybe its not enabled, but when i follow the manual on how to enable it it gives me an error.

system - SNMP - SNMP V1/V2 - Community configuration

Management Station ip 0.0.0.0 - Management Station IP Mask 0.0.0.0 - Community string public - Acess Mode ReadOnly - Status Enable

when i then click add i get get error message "Error: Default public and private community strings are not allowed"

Any ideas?

or am i comepletely off?