Hi Jaap, Could you please increase the Poller Logging Level in the General Settings to Debug or High for at least one cacti run and post the content of the relevant part of /var/log/cacti/cacti.log /var/log/cacti/poller_error.log and /var/log/cacti/rrd.log ? Maybe there is useful information there.
An other option might be to check what the output is of a manual run of the poller: php /usr/share/cacti/site/poller.php Paul
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