bug report - error on local server

upon setting up private server, on client connection attempt the client get error
suggesting unknown hostname isn't resolve ,but i see no reason way using host name in the first place while having the serverip,
didn't add it on the hostname on the client host file yat .
hope that's helps you guys.
stacktrace:
AbstractPlainSocketImpl.java:184
suggesting unknown hostname isn't resolve ,but i see no reason way using host name in the first place while having the serverip,
didn't add it on the hostname on the client host file yat .
hope that's helps you guys.
stacktrace:
AbstractPlainSocketImpl.java:184