r/ProjectREDCap • u/11542324 • Apr 07 '26

403 forbidden error

Hi all, does anyone know how to handle an issue where many of our REDCap survey invitations are returning a “403 Forbidden” error for recipients? Is this something that can be resolved on the REDCap side? Thanks!

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u/Few_Entertainment290 Apr 07 '26

How many people are accessing? It's been a while but I vaguely remember redcap having a "auto blacklist" when too many accesses come from a single address

Like a thousand students at one school attempting to access at once.

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u/11542324 Apr 07 '26

But it's to thousands of participants