502 Bad Gateway error: Form doesn't notify when submitted

Hi.

We've a problem with one of our forms :

When we try to submit a new entry, it doesn't return the "Thank you" page. Seems hung in a loop, loading the submit button with "please wait"  status

It neither sends the confirmation emails.

When we check it with a report, we see the form entry, but without ID.

After a while it fails and returns a "502 Bad Gateway" error.

I've tried to edit one of the failed submitted forms, the result is the same.

It's affecting all different users/computers.

Thanks in advance for your help and regards.

Please note that our developers were aware of the issue and managed to resolve it. Please try again and get back to us if the problem persists.

Apologies for any inconvenience.