Web Farm

Windows 2012 R2 Servers

IIS 8.5

Kemp Load Balancer for External Access and NLB Balancer Setup for internal access

All working great with my HTTP and ASP sites.

I am trying to build a few PHP pages

I was getting a "PHP Error 405 verb used to access this page not allowed"

Then I was told to upgrade my PHP from 5.6 to 7.2

So I removed PHP from my IIS

Then installed PHP 7.2

After several days of frustrating attempts I am now getting this

Server Error
500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.

created a small test.php

 <?php
phpinfo();
?>

https://www.tgcsnet.com/test.php

you can try this and see

this happens internally and externally

I installed PHP Manager for IIS v 1.5.0  it works   but when I try for PHPinfo from the PHP Manager I get this error

There was an error while performing this operation

Details

PHP is not registered via FASTCGI hence there is no FastCGI handler defined

I can run php -info   it shows all info about php
I can run php - m it shows all modules

just can not browse the page

What else to check?

Thanks