I have installed LimeSurvey on a cPanel server
I have created a survey with 3 questions
I have a CPDB with 3 participants
I have imported the 3 particpants to the survey
I am using the default templates

When I click "Send invitations" I get a page with one word "Forbidden" (see attached)

I have checked the SMTP settings and tried several SMTP servers and get the same result each time.
I have tried changing the permissions (as advised in the manual) and get the same result

The survey is NOT activated.
I tried with a previous survey that WAS activated and got the same result. I then deleted that survey and created a new one.

I have read the manual very carefully
I see that several other people have had the same problem but none of the ansers has helped me.

Any suggestions please?

Sounds like a permission problem to me. Check if your folder permissions are set correctly.

Did you install LS via Softalicious? Because we do not know what they do to Limesurvey so it might be a problem introduzed by Softalicious.

Thank you for responding.
The permissions (for all folders) are currently 755. I changed them to 777 with the same result ("Forbidden").
Yes, it was installed via Softalicious.

Something related to forbidden url … look at error log in cpanel.

It's clearly a server configuration problem, not related to LimeSurvey.

Thank you for your response.
I get a blank error log - the mouse turns to a circle with a line through it.
I guess I need to contact the server provider....

@LouisGac Not "clearly" enough for me. If the error occurs when I click a button in LimeSurvey, and an error occurs, it is reasonable to start looking there.

well knowing that you're using cPanel, I guess you're using a VPS or a dedicated server... So your provider will probably tell you that you must configure it by yourself.

**SOLVED**
I have posted details here for anyone else with the same problem (and for me next time I create a survey).
Our web server provider found a rule in the web application firewall which was potentially identifying something in limesurvey as malicious.
They whitelisted two rules and the problem was resolved.