[squid-users] Strange problem with italian educational website

[Job]

Hello,

i am writing because, with Squid 3.4.4 (i use it in production), i cannot use a website (used in Schools!):

http://bandidgstudente.it/it/home-page/

I have lots of server-side error, and i thought it was a problem with remote webserver.

If i disable transparent proxy and i nat connection, the website works fine!

These are the errors:

Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: PDOStatement::execute(): SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'indirizzo_ip' cannot be null in /htdocs/public/www/_servizi/database/database_class.php on line 253 Warning: 

Do you think there are some problems with squid and these website?

Thank you!
Francesco