Yeah, It is the server side and problem with mono I think,
If a site has ASPX and PHP files together then the PHP files are working but the ASPX files are not.
Register globals are off
To get ip address you have to use $_SERVER['REMOTE_ADDR'];
Why don't you use mysql table to store that is good option.
EDIT:
ah-blabla you beat me.
If you have many files. It is recommended to use FTP for uploading.
servername : ftp.yourdomainname.com
username : your cpanel username
Password : your cpanel password.
Place your files in the public_html
Are you using the ASPX pages. Because yesterday also some people reported their aspx pages are not working. If yes then staff has to answer this problem.
If you know that the hosting account is deleted then re register for hosting account. you can use this forum account
If you are not confirm then post your cpanel username The staff will confirm what happened to your account.