I'm suspecting they are blacklisting your address based on what I see. Also not sure of your env but if you have multiple address or interfaces try sourcing the client with that address and try ( src.nat in the policy and a ippool or egress interface SNAT )
thanks for all your answers. I will see what support (of the webhoster) tells me tomorrow. This is very weird. I have no idea what happended here.
Hm. I am not 100% sure about what you are meaning exactly @emnoc: I have multiple official IP Adresses. I assume you mean that I should give one client "another" address @WAN-side? Correct? So I will see whether our official IP is blocked @ the provider?
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