404 Bad Request On Prestashop When Adding Product Price

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You successfully installed prestashop on your web server, and the next big things you do was adding product to it. But, shit happens when you not expect them and you got the following error:
Forbidden
You don't have permission to access /******/index.php on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

There wasn't anything in the php.ini related to this issue but while you are there, check your resource limits because if they are too low, you will see errors elsewhere. This is something that should be adjusted, based on what your hosts limitations are, for any PS store. Often times the default php.ini has room to increase these variables. Here is an example oh resource in php.ini but your host may not allow certain variables - check with them to max out your resources available.  
;;;;;;;;;;;;;;;;;;;
; Resource Limits ;
;;;;;;;;;;;;;;;;;;;

max_execution_time = 10000     ; Maximum execution time of each script, in seconds
max_input_time = 60 ; Maximum amount of time each script may spend parsing request data
memory_limit = 1024M      ; Maximum amount of memory a script may consume (32MB)
suhosin.get.max_vars = 10000;
suhosin.post.max_vars = 10000;
max_input_vars = 6000;
For anyone that runs into this issue, check with your hosting provider. Permission settings may have to be modified on the server. Below is an example on mod_security error on web server that you ask your hosting company to check it.

Your host should be able to disable that rule by SecRuleRemoveById ID_number

[error] [client ##.##.####] ModSecurity: Access denied
required. [file "/usr/local/apache/conf/modsec2_rules/10_asl_rules.conf"] [line
"497"] [id "######"] [rev "287"] [msg "Atomicorp.com UNSUPPORTED DELAYED Rules:
Remote File Injection attempt in ARGS (AE)"] [data "http://google.com"] [severity
"CRITICAL"] [hostname "##.##.####"] [uri "/psmanager/index.php"] [unique_id
"###################"]