Your LimeSurvey version: 3.27.6+210629
Own server or LimeSurvey hosting: Own server
Survey theme/template: Fruity
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Hello,

Not sure if possible but are we able to restrict users to one response per IP address? We're using a panel for our survey and need to ensure high quality of data - one way of doing this is to make sure we don't get any duplicates, so someone completing the survey multiple times. Anyway we can reject responses if their IP address has already been captured in a previous response?

Thank you.

Set cookie to prevent repeated participation - www.limesurvey.org/manual/Publication_%2...peated_Participation

BUT...

1) Can be defeated by deleting cookies
2) May prevent two legitimate participants responding from the same building

...also - www.limesurvey.org/manual/Notifications_...a/en#Save_IP_Address

Think IP adress can be used for unicity … no : it's false.

Multiple user can have same IP address
One user c an have multiple IP address
It's easily spoofed …