Errors after switching to FastCGI

[websys]

Hello, recently I switched the PHP handler from suPHP to FastCGI. Since then I have noticed that there are errors in the cronjobs. For instance:

 

--2014-03-21 00:00:01--  http://www.domain.com/whmcs_dir/modules/registrars/enom/enomsync.php
Resolving www.domain.com... xxx.xxx.xxx.xxx
Connecting to www.domain.com|xxx.xxx.xxx.xxx|:80... connected.
HTTP request sent, awaiting response... 404 Category not found
2014-03-21 00:00:09 ERROR 404: Category not found.

 

or that:

 

--2014-03-21 00:00:01--  http://www.domain.com/whmcs_dir/crons/domainsync.php
Resolving www.domain.com... xxx.xxx.xxx.xxx
Connecting to www.domain.com|xxx.xxx.xxx.xxx|:80... connected.
HTTP request sent, awaiting response... 500 Internal Server Error
2014-03-21 00:00:41 ERROR 500: Internal Server Error.

 

or even:

 

--2014-03-21 03:00:01--  http://www.domain.com/whmcs_dir/admin/cron.php
Resolving www.domain.com... xxx.xxx.xxx.xxx
Connecting to www.domain.com|xxx.xxx.xxx.xxx|:80... connected.
HTTP request sent, awaiting response... 500 Internal Server Error
2014-03-21 03:00:41 ERROR 500: Internal Server Error.

 

If I enter the http://www.domain.com/whmcs_dir/admin/cron.php URL in my browser, it executes just fine.

 

Any advise?

 

Kind regards,

Manos K