Php - Ingres, fresh install : How to debug?

I just finished to install Ingres on my server(only the client part, to connect to an existing ingres server), I just added the php_ingres module.

Now php recognize my m开发者_C百科odule, so I tried to connect my self to several existing servers, but I always a

Unable to connect to database (Hostname here)

But with this I can't find what is wrong?? ingres error? Php driver? Credentials? ...?

What can I do to isolate these problem?

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Most likely it's a user credentials issue. To see the actual error message use the following code:

$connection = ingres_connect(.....);
if (!is_resource($connection))
{
   trigger_error(ingres_errno()." - ". ingres_error(),E_USER_ERROR);
}

You might also want to take a look at http://community.ingres.com/wiki/Ingres_with_Apache_on_Debian_Etch which outlines the setup steps for Ingres, PHP, Apache and Debian/Ubuntu.