@SimonQ I am not using the last version of this plugin (I made a fork when the regex issue arised) so I could not reproduce your problem. So I just tried on a testing version of the forum I am in charge and I observe the same behaviour. So it is not just you. I suppose it is a question of tweaking the css though. I will try to have look but I am VERY far to be an expert.
Hi guys, sorry I can't be of any help. I don't have any experience with IIS, but you seem to be on the right track, the client's IP should be forwarded to the node backend by your webserver.