Thanks for all the write in's. It has actually been very helpful to get many varying views.
In the end, I found help on the actual howto to force certificate logins from one of the links posted. Unfortunately, I can't redirect ssh to port 443 because I actually use https. Controlling the number of logins per minute was a great suggestion which I will also incorporate. There seemed to be quite a variation in views over port knocking so I won't worry too much about that at this stage. Thanks again for all the responses Regards Phill O'Flynn -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
