SERVER ERROR 503 – STRATO

I install the fortuna theme in STRATO and all it is ok, but when i tried to save theme configuration i received this error

ERROR 503
Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.

I received this error only in strato, i installed the same web in other server or local and no problem. When i deactive STRATO filter spam, the problem solved, but i dont like to deactive this option because its necesary.

This only happen with theme fortuna, other themes installed in STRATO from themeforest dont have this problem

this is the filter spam i deactived and the web whith the tip and solution to problem but i want to know why only happen with fortuna

http://www.unostips.com/error-503-service-temporarily-unavailable/

http://www.unostips.com/wp-content/uploads/2013/12/error-503-serverside-security.png