I have recently experienced a slow ssh login issue on ubuntu 13.10 (xubuntu actually).
Tried all kind of solutions from internet, nothing worked, except this:
Edit the following file:
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sudo nano /etc/nsswitch.conf |
Find the following line:
hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4
replace with
hosts: files dns
Voilà!
Ssh authentication working like a charm!