git - coding.net的ssh連線時出現hostkey的問題

Question

依照官網的方法設定公鑰後，輸入指令ssh -T git@git.coding.net時候出現

The authenticity of host 'git.coding.net (blahblah)' can't be established.
RSA key fingerprint is 
blahblah.
Are you sure you want to continue connecting (yes/no)? 
Host key verification failed.

這是為什麼？

我coding上的專案能夠正常push和pull，github也可以，而且對github使用ssh -T也是正常的