: Possible reasons: The version of PHP or MySQL has changed and code that is either obsolete or dependent on a side effect of a function that has been fixed and no longer occurs is now broken

@Kristi941

Possible reasons:


The version of PHP or MySQL has changed and code that is either obsolete or dependent on a side effect of a function that has been fixed and no longer occurs is now broken or disabled
The login credentials for MySQL are different and your code does not output errors so the page just reloads.
You use Register Globals and the new server does not support it


Recommendations for troubleshooting:


Turn error reporting on and output all errors
Put in simple checks for errors at all stages of the login process to see where it is failing particularly where the SQL queries are performed

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