SSH connecting with key, from my machine suddenly got incredibly slow (~10sec!). It is not a server or DNS problem as far as I can figure out.
The problem suddenly appeared after a simple
apt-get install kubuntu-desktop and some minor KDE related mucking around, on my Ubuntu 15.04 x86_64.
ssh -vv ... shows me that it waits for ages (most of the ~10sec...) at the last line from this:
OpenSSH_6.7p1 Ubuntu-5ubuntu1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /home/neuronq/.ssh/config
debug1: /home/neuronq/.ssh/config line 1: Applying options for XXX.com
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
/etc/ssh/ssh_config contains this (I didn't paste the commented out lines):
Host * SendEnv LANG LC_* HashKnownHosts yes GSSAPIAuthentication no GSSAPIDelegateCredentials no
Is there any way in which Kubuntu desktop install can suddenly result in this slowdown (some keystore/wallet weird thing)? (Also, in KDE I couldn't get ssh login by key to work at all, except in the terminal by manually doing a
ssh-add beforehand and entering my key passphrase, but I've since given up on KDE completely and I'm back to Unity, so I don't longer care about this... but it could be related)