[chef] error in knife bootstrap using keypair

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I am using hosted chef , I tried to bootstrap from workstation(instance from
softcom provider) to client(instance from softcom provider) using command 
like 

knife bootstrap 66.207.205.152  -x  root  -i   ~/.ssh/orchestration_kp.ppk 
--sudo, but it shows error like below
Bootstrapping Chef on 66.207.205.152
ERROR: Network Error: Connection timed out - connect(2)
Check your knife configuration and network settings

for this instance(softcom) having username and key pair instead of password .
some provider provides password for instance instead of key pair  for these
type of instance using command like 
knife bootstrap 66.207.205.152  -x  root  –P    FER$ed --sudo , but its 
working
properly.


I don’t know how to knife bootstrapping to client instance (with key pair) I
fully searched wiki.opscode.com site I didn’t get any proper solution . I
placed this key pair  in ~/.ssh/ directory in client instance.


I have to know what are the steps for knife bootstrapping from workstation to
client(with key pair ,both are instance).
Where I want to keep the authentication file in client instance or workstation
in which format (pem or ppk )
I have to make a change in knife.rb file or where I want to give 
authentication
for this??
Do u have any online chatting facility to Opscode supporting team.

Please send any solution for this as soon as possible I am in big problem.