I am running APF 9.6.

There is an IP address I cannot ping if APF is enabled. But it's OK if I stop APF.

The IP is not listed in /etc/apf/deny_hosts.rules. It doesn't help if I add the IP to allow_hosts either.

I have also tried disabling realtime lookups:

USE_DS="0"
USE_DROP="0"

But that doesn't fix it (In any case the IP is not listed at DShield or Spamhaus).

Where else/how else could APF be blocking that IP?

Check if it's listed in /etc/apf/deny_hosts.rules.

Also add the IP to allow_hosts

If this doesn't work, try disabling realtime lookups:

USE_DS="0"
USE_DROP="0"

Then check if it is listed as DShield or Sparmhaus.

Good Luck

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