git - coding.net的ssh连接时出现hostkey的问题

Question

按照官网的方法配置公钥后，输入命令ssh -T git@git.coding.net时候出现

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.

这是为什么？

我coding上的项目能够正常push和pull，github也可以，而且对github使用ssh -T也是正常的