This is a php server issue.
The host should be able to update the php.ini file for you to set the default timezone to prevent that error from occurring. It happens if the default time zone is not set in the php.ini.
alternately you can add the following code to your page to set the time zone:
The list of valid timezones is here...
As for question 2, there really isn't a way for the Server to 'log in' to security assist in the sense of creating a user Session. what you could do is set the cornjob to pass a query string, make it something complex like:
and set up an access rule as
URL Variable mMAoM01LT3305Qha
and apply that access url to the page rather than one that uses a session
the chances of a random user guessing a URL variable like:
are pretty slim at best