The MPR_SERVER_SET_CONFIG_EX_3 structure<179> is used to set the configuration parameters for the RRAS server

 typedef struct _MPR_SERVER_SET_CONFIG_EX_3 {
   MPRAPI_OBJECT_HEADER_IDL Header;
   DWORD setConfigForProtocols;
   MPRAPI_TUNNEL_CONFIG_PARAMS_3 ConfigParams;
 } MPR_SERVER_SET_CONFIG_EX_3,
  *PMPR_SERVER_SET_CONFIG_EX_3;

Header: This MUST be an MPRAPI_OBJECT_HEADER_IDL (section 2.2.1.2.129), the revision field MUST be 0x03, and the type field MUST be 0x03. 

setConfigForProtocols: Same as setConfigForProtocols in MPR_SERVER_SET_CONFIG_EX_1 (section 2.2.1.2.145). 

ConfigParams: This MUST be an MPRAPI_TUNNEL_CONFIG_PARAMS_3 (section 2.2.1.2.249) structure.