What specifically are you trying to do while SSHing in?
Like most WP users, I only have FTP access to my server. Ricardo's instructions start:
Step 1. Upload to your plugins folder, usually wp-content/plugins/ and unzip the file
I can't find any information on how to do this. Every other plugin I unzip on my hard drive then upload, but this does not produce the necessary result:
it will create a wp-content/plugins/wp-cache/ directory.
Then the instructions say:
Step 5. Create a symbolic link from wp-content/advanced-cache.php to wp-content/plugins/wp-cache/wp-cache-phase1.php.
Reading down past lots of unanswered questions about this I finally see comment 351:
Clueless, what you need to do is login using SSH (or Telnet) to your server with a user that has the rights to make symbolic links.
If you are able to explain how an ordinary WP user on a shared host can achieve this it would probably be more appropriate on the plugin page I've linked to.
I appreciate your help, and the information on how to install the WP-Cache plugin will be very useful to lots of people who can't get an understandable answer from the author.
However, I'd still like to know why the webserver I am on is not behaving and if it can be fixed.