2) I have Apache running on a local web server in our office (not the
IT department). It accesses the SQL Server database remotely. I have
register_global turned OFF and use the following code on each page:
Are you using an old version of PHP? Don't use session_register(). Use session_start() and then reference everything with the $_SESSION array. In your code above, $logged_in and $username will not exist with register_globals off. That may be leading to the errors you see later.
The question I have is:
What concerns should I have with PHP sessions when I move from Apache to IIS?
None if sessions are set up correctly on each machine and you're using the same version of PHP at the same error reporting level.
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