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We have no ipv6 configured at the customers. I was also already thinking of packat filtering, but on what base?
Without pfsense/opensense there is no problem.

Thank you for your feedback. That does only make it stranger to me.
Another thing is clients told me the website sometimes works (not when I'm testing), but only for a few minutes.
It makes no sense to me...

I've already posted this question in the dutch subforum, but it might be better on this one.
Since a DDoS attack on several Belgium government websites last Thursday, it is not possible to reach (for example) the website https://belgium.be
This is only the case for clients behind opnsense and pfsense firewalls on multiple isp's en locations (also multiple fw versions). When I connect directly to the modem (same ip), everything works well.
I suppose this is a result of the actions they took to stop the DDoS attack, but it's very strange also pfsense/opnsense firewalls are affected by these actions.
Thanks in advance,
Guy

Dag allen
Afgelopen donderdag werden enkele Belgische overheidswebsites slachtoffer van een DDoS aanval.
Sindsdien kan geen enkele klant met een pfsense/opnsense firewall de website https://finance.belgium.be nog bereikbaar.
Haal ik de firewall ertussenuit, is er geen probleem.
Ik ga ervanuit dat er maatregelen getroffen zijn voor de DDoS attack, maar waarop wordt er dan gefilterd waardoor beide firewalls geblocked worden?
Alvast bedankt om even mee na te denken.
Mvg,
Guy