Just googled whether I find a solution, found this by occasion.
According to this thread it might be a cookie related problem.
This post points to a PunBB extension that claims to work without cookie mechanism:
This is the direct link to GitHub:
https://github.com/MioVisman/punbb_exte … _stop_bots
The original mechanism should work like this, but actually fails:
- guests being asked for each post
- forum members once every two weeks
On forum there were speculations that different browsers and php versions delivered different results.
But if the posting above is right, then it comes back to a cookie related problem.
It could be the case that this can be solved by this other version of anti-bot extension...
Sorry I can't test .. maybe it helps .. no guarantee, good luck !
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