slow ssh under ubuntu fix

October 21, 2008 at 2:12 pm · Filed under mess ·Tagged gssapi-with-mic, slow, ssh, ubuntu

Oh, the grinding and gnashing of teeth! My ssh to various boxes was redonkulously slow… I finally realized… it was just me… or rather just my ubuntu… or actually… just the ssh_config for my ubuntu…

Thanks to ssh -v, I saw:

debug1: Authentications that can continue: publickey,gssapi-with-mic,password
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure.  Minor code may provide more information
No credentials cache found

debug1: Unspecified GSS failure.  Minor code may provide more information
No credentials cache found

which made me say: wtf is gssapi-with-mic? After some digging, I found this crap in /etc/ssh/ssh_config:

GSSAPIAuthentication yes

I changed it to

GSSAPIAuthentication no

check the difference:

% time ssh some_host echo GSSAPIAuthentication yes
GSSAPIAuthentication yes
real    0m15.398s
user    0m0.028s
sys     0m0.004s
% time ssh some_host echo GSSAPIAuthentication no
GSSAPIAuthentication no
real    0m0.364s
user    0m0.028s
sys     0m0.008s

The math sez it’s about 42x faster with that dumb junk turned off!

>.<

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