[deanhills]

Putty is a great tool,  it is supported on mobile devices also, always I had issue on using keys to login by putty. It seems logging into the server is more secure by keys.
But having the key files reusable through other systems may be dangerous.  I hopethis update is about some security regarding that.

You're right @Littlemaster. The keys don't work perfect with PuTTy. Like the first time I used it end of last year, it lasted for a month, and then completely screwed me as I'd disabled login in addition to the setting up keys.

With VPS 15 I only created keys without disabling the login. This time round fortunately when the keys stopped working after I'd updated PuTTy, it allowed me to login normally. And with the changed port number. Sigh of relief!