Error Redirect Protected Login page

Recently upgraded to PHP 5.6 (not sure if this is why I am now having these issues) and Login Page for my Protected Pages is throwing an error:

Warning: Cannot modify header information - headers already sent by (output started at /home/content/29/8748029/html/protected_LogIn.php:5) in /home/content/29/8748029/html/WA_SecurityAssist/Helper_PHP.php on line 37

Line 37 of Helper_PHP.php starts with the word "header" in the following function:

if($WA_Auth_Parameter["successRedirect"]!=""){
$WA_Auth_Parameter["successRedirect"] = WA_Auth_BuildRedirectURL($WA_Auth_Parameter["successRedirect"], $WA_Auth_Parameter["keepQueryString"], FALSE);
header("Location: ".$WA_Auth_Parameter["successRedirect"]);
exit();
}

These pages have worked great for a number of years and only just today started having issues.

The source of the problem is on protected_LogIn.php line 5.

This post has been deleted.

Line 5 of my login page is: <?php require_once('Connections/conn_inventory.php'); ?>

Not sure how my DB connection file is causing the error. HELP!

I have reinstalled the full DataAssist V2 package, tried to recreate my protected login pages 5 times, and I am still getting the same error messages. The login page upon clicking the login button still throws the similar error messages:

Warning: Cannot modify header information - headers already sent by (output started at /home/content/29/8748029/html/Connections/conn_inventory.php:10) in /home/content/29/8748029/html/login2.php on line 23

Warning: Cannot modify header information - headers already sent by (output started at /home/content/29/8748029/html/Connections/conn_inventory.php:10) in /home/content/29/8748029/html/login2.php on line 27

Warning: Cannot modify header information - headers already sent by (output started at /home/content/29/8748029/html/Connections/conn_inventory.php:10) in /home/content/29/8748029/html/login2.php on line 39

Warning: Cannot modify header information - headers already sent by (output started at /home/content/29/8748029/html/Connections/conn_inventory.php:10) in /home/content/29/8748029/html/login2.php on line 43

Warning: Cannot modify header information - headers already sent by (output started at /home/content/29/8748029/html/Connections/conn_inventory.php:10) in /home/content/29/8748029/html/WA_SecurityAssist/Helper_PHP.php on line 37

I see that the error message is pointing to line 10 of my DB connection; line 10 is:

$conn_inventory = mysql_pconnect($hostname_conn_inventory, $username_conn_inventory, $password_conn_inventory) or trigger_error(mysql_error(),E_USER_ERROR);

These pages had been working great for about 6 years, but only just started throwing error messages when we upgraded to PHP 5.6 2 days ago.

I would greatly appreciate your expertise in getting this resolved.

You probably have error_display turned on in your php.ini file. That line would produce a deprecated message warning you that it won't work once you update to php 7. You may have to turn off deprecated messages (it won't effect the functionality of the page). That will prevent it from printing the error and allow the redirect to proceed.

If you give me FTP access and a URL with steps to reproduce the error I could try turning off deprecated messages on the page to confirm that is the cause.

I used the following code you provided to another user who was having the same "deprecated" error messages on all my pages:

<?php
error_reporting(E_ALL & ~E_DEPRECATED & ~E_NOTICE);
?>

which is why line 5 on all my pages is:

<?php require_once('Connections/conn_inventory_i.php'); ?>

The deprecated messages no longer appear, however, every one of my pages is throwing up at least one error message saying:

Warning: Cannot modify header information - headers already sent by (output started at /home/content/29/8748029/html/anypagename.php:5) in /home/content/29/8748029/html/WA_SecurityAssist/Helper_PHP.php on line XX

(where XX = whatever line in the Helper_PHP.php file, and anypage.php:5 all point to the "<?php require_once('Connections/conn_inventory_i.php'); ?>")

Why is my db connection file causing an error saying "header already sent"?

HELP!

You have a blank line on line 4 of both pages... a blank line counts as sending content to the page, so redirects can't happen lower after.

Thank you -- I figured the errors were something silly like that.

I have deleted the spaces between all the php lines on my pages, so now I don't get any errors, but after entering valid login credentials on the page login it returns to the login page, with no redirect to the results page. And I try to go to the results page, it redirects to the login page. So I am stuck on the login.

What credentials are you using to log in? I need to reproduce the issue in order to look into it.

see private message with login credentials