Solution for this
It took me a long time to find the solution to this problem, and here it is for anyone else who comes upon it.
Rather than having to generate a key with Plesk and order another SSL, you can do the following:
1) Remove the encrypted password from the key:
Remove the encryption from the RSA private key (while keeping a backup copy of the original file):
$ cp server.key server.key.org
$ openssl rsa -in server.key.org -out server.key
Make sure the server.key file is only readable by root:
$ chmod 400 server.key
Then just import in to Plesk! I found these directions at
http://httpd.apache.org/docs/2.0/ssl/ssl_faq.html#removepassphrase for reference.
Or, if you really want the encrypted password, then you can copy the https section out of the httpd.include in /conf for your virtual host. Then disable SSL for the domain, and create a new file: /etc/httpd/conf/yourdomain.conf and paste in the info you copied before. Cut out everything except what is between <ifmodule mod_ssl> and </ifmodule> (should be quite large).
Change the key to point to wherever you put the key and cert (usually /etc/httpd/conf/ssl.key and ssl.crt). Then in httpd.conf (before the line: include /etc/httpd/conf/httpd.include) put in: include /etc/httpd/conf/yourvhost.conf.
Reboot Apache and it will prompt you for your security password!
I really dislike the latter way of doing it, as it is quite messy, but it is indeed more secure if you require it.
You will have to change the paths I included here to match your distro of course!
Jordan
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