Gateway Time-out

[dakotaclan]

Hi Friends,
I have a problem with the small form dedicated to each product to ask questions about the product.
Once you have filled all the fields and entered the e-mail, send a request but I always get this error:
Gateway Time-out

The gateway did not receive a timely response from the upstream server or application.

Thanks

Use VirtueMart 3.0.10 and Joomla 3.4.5