c# - IPWorks JSON error - Address family not supported -

i've install ip*works trial components use json component request restful services.

i've managed code working using standard httpwebrequest ip*works components getting error cannot fathom.

ide: xamarin  project: ios mobile iphone/ipad app  language: c# 

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error is:     connection attempt failed (addressfamilynotsupported). 

my code is:

public string getcsrftoken()     {         string csrftoken = "";         json ipwrest = new json ();          ipwrest.contenttype = "application/json";          try{             ipwrest.post(@"http://localhost:9007/quote-and-buy-performance/api/user/token.json");             csrftoken = ipwrest.transferreddata;              console.out.writeline ("getcsrftoken->response: " + csrftoken.tostring());         }catch(ipworksjsonexception jsonerror){             console.out.writeline (jsonerror.message);         }          return csrftoken;     } 

what else have tried:

• change localhost 127.0.0.1 - 302 , url not return json in postman client.
• changed between , post methods
• removed .json extension on url
• changed rest object instead of json i.e. rest ipwrest = new rest ();
• ip*works documentation of errors suggests tcp/ip error no further information.