invalid private key on faucet registration

Hey! 

Trouble with faucet registrator on web-wallet. 
I have launch eos-node with 
plugin = eosio::faucet_testnet_plugin
With registered account faucet and private-key, specified in config.ini. 

But in frontend, when i try to register a new account, i have answer: "invalid private key". 
This service interact directly with node, or i must specify private key in frontend application? 