SSH-Login and Nautilus sftp://

I wanted to access my Fileserver with Nautilus by just typing "sftp://fileserver-ip/path", but I only got the Error-Message shown in the following Picture:


Because a Login via ssh and sftp on the Command Line took some Time between the Command and the Password-Prompt, I thought the Error-Message was caused by a Time-out. So I looked for something to speed up the Login.
What I found was:

Edit the File /etc/ssh/sshd_config

Append the Lines:
LookupClientHostnames no
VerifyReverseMapping no

Now I can use Nautilus to access my Fileserver, like I used to do with Konqueror and the fish://-Plugin.