[yallah]

There are several things that could have gone wrong:

• Is the name of the profile right?
  
• Did you MD5 encodeyour password? If not you either need to do that or set the optional "encryption" property of the "password" parameter to "none". For security reasons the default is to MD5-encode your password.
  

PS: This is not the right thread to ask about problems with requests.

1/ Yes : I user right profile name because when I use http://192.168.2.176/jsonrpc?request={"jsonrpc":"2.0","method":"Profiles.LoadProfile","params":{"profile":"Master user"},"id":1} , it's working (when I remove password in profile from xbmc client).

2/ I tried already with http://192.168.2.176/jsonrpc?request={"jsonrpc":"2.0","method":"Profiles.LoadProfile","params":{"profile":"Master user","password":{"value":"12345","encryption":"none"}},"id":1} or http://192.168.2.176/jsonrpc?request={"jsonrpc":"2.0","method":"Profiles.LoadProfile","params":{"profile":"Master user","password":{"value":"12345","encryption":"md5"}},"id":1} , it's same issue

PS: Sorry :/