Problem: Slow SSH log-in
Fractal is getting more and more troublesome recently... It has a hug lap for ssh and also su . It took me a while to debug. In the end, my labmate, Aravind, found the culprit -- log file explosion. Here's some symptons observed and the final solution offered by Aravind. :)
1. use "vvv" mode for ssh to show error information.
$ssh -vvv username@fractal.mit.edu
OpenSSH_7.2p2, LibreSSL 2.4.1
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 20: Applying options for...
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