The server (a Debian) was installed by one of my long gone
predecessors and has been running flawlessly for several years.
Although I know my way around Linux, I don't know enough PHP or Apache
to figure out what's wrong.

As far as I can tell, nothing has happened over the weekend. The
server didn't go down. I didn't upgrade the system on Friday, either.

What more info do you need to be able to help me?

Thanks,
Nick.

Example of return text:
<?php
        # Mantis - a php based bugtracking system
        # Copyright (C) 2000 - 2002  Kenzaburo Ito - ken@300baud.org
        # Copyright (C) 2002 - 2004  Mantis Team   - mantisbt-
d@lists.sourceforge.net
        # This program is distributed under the terms and conditions of the
GPL
        # See the README and LICENSE files for details

        # --------------------------------------------------------
        # $Id: index.php,v 1.15.18.1 2006/07/22 20:03:00 vboctor Exp $
        # --------------------------------------------------------
?>
<?php require_once( 'core.php' ) ?>
<?php
        if ( auth_is_user_authenticated() ) {
                print_header_redirect( config_get( 'default_home_page' ) );
        } else {
                print_header_redirect( 'login_page.php' );
        }
?>

PHP is version 4:
moria:~# apt-show-versions | grep php
php4-common/stable uptodate 6:4.4.4-8+etch2
php4-dev/stable uptodate 6:4.4.4-8+etch2

Apache is 1.3:
moria:~# apt-show-versions | grep apache
apache/oldstable uptodate 1.3.33-6sarge3
apache-utils/oldstable uptodate 1.3.33-6sarge3
apache2-utils/oldstable uptodate 2.0.54-5sarge1
apache-doc/oldstable uptodate 1.3.33-6sarge3
apache-common/oldstable uptodate 1.3.33-6sarge3

Please post a copy of the .htacess file in your root directory (or
secure parts of it you don't mind sharing) if you're not sure what to
look for.

-Mike PII

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