[Karellen]

it has been blocked for quite some weeks now

Ah, right. I thought it was just blocked for a few hours or a day. You either have a static IP Address, or quite a lot of spammers are using that same service.

If you provide the IP Address you are currently using, I will unblock it, and you can see how long it lasts.

To do so, I'd need to know the Kodi forum IP range / domain.

I don't have that info, but maybe @ronie or @Kib do.