ArrowChat (PHP) hosted on IIS with MS SQL Server - php

I am trying to test a trial version of ArrowChat on windows (using IIS and MS SQL Server). I have installed the extensions of MS SQL Server and when i connect using a PHP script, i get connected successfully. However, with Arrow chat it errors. It doesnt show any error details either.
Is there a way to see the log? I am not a PHP developer.

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I have used default MS SQL driver to connect to a SQL server in a php application.
I'm using XAMPP 1.6.8. my php version is 5.2.6.
Application was connected successfully to the SQL server and the application was running successfully for a long time. Now suddenly the application is showing an error on mssql_connect() function with same MS SQL access information.
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I also checked the SQL server access info with a SQL client. SQL client can connect successfully, therefore i think the access info is correct.
Can any one help me resolved this issue?
Thx
I just found my solution here. http://jimmyli.net/2009/03/php-unable-to-connect-to-mssql/ .problem was that the file ntwdblib.dll packaged with PHP5 was an old version. then i just replace with updated one from here http://jimmyli.net/wp/wp-content/uploads/2009/03/ntwdblib.zip
Thx

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After restarting IIS evreything again works fine..
What could be the problem?
This could be some PHP bug, try updating the PHP version.

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