Two things to check first:
You didn't mention the actual error, etc...but
#1. for database errors
look at your /admin/includes/configure.php
these lines:
------------------------------------snip--------------------------------------------------
// define our database connection
define('DB_SERVER', 'localhost'); // eg, localhost - should not be NULL for productive servers
define('DB_SERVER_USERNAME', 'catalog');
define('DB_SERVER_PASSWORD', 'password');
define('DB_DATABASE', 'catalog');
define('USE_PCONNECT', 'false'); // use persisstent connections?
define('STORE_SESSIONS', ''); // leave empty '' for default handler or set to 'mysql'
?>
------------------------------------snip--------------------------------------------------
Make sure the database fields are exactly the same as what you used to setup your database...i.e.
grant all on store.* to catalog@localhost identified by 'password';
"catalog" and "password" being the key fields.
#2.
In this part of your configure.php
----------------------------------------snip------------------------------------
// Define the webserver and path parameters
// * DIR_FS_* = Filesystem directories (local/physical)
// * DIR_WS_* = Webserver directories (virtual/URL)
define('HTTP_SERVER', '
http://www.your-domain.org'); // eg,
http://localhost or -
https://localhost should not be NULL for productive servers
define('HTTP_CATALOG_SERVER', '
http://www.your-domain.org');
define('HTTPS_CATALOG_SERVER', '
https://www.your-domain.org');
define('ENABLE_SSL_CATALOG', 'true'); // secure webserver for catalog module
define('DIR_FS_DOCUMENT_ROOT', '/home/e-smith/files/ibays/store/html'); // where the pages are located on the server
define('DIR_WS_ADMIN', '/store/admin/'); // absolute path required
define('DIR_FS_ADMIN', '/home/e-smith/files/ibays/store/html/admin/'); // absolute pate required
define('DIR_WS_CATALOG', '/store/catalog/'); // absolute path required
define('DIR_FS_CATALOG', '/home/e-smith/files/ibays/store/html/catalog/'); // absolute path required
-----------------------------------snip--------------------------------------------
Make sure your paths are correct. If you followed the howto to the "T" then your paths to /store/admin and /store/catalog would be as above. If not, adjust with this as a baseline to compare from.
These are the most common causes of inability to access the "admin" pages.
Craig Jensen