Anonimous IP

[#1]

I am having a problem with one website; royalgames.com
I keep getting; 'login blocked'.
I made a query with their IT people and have been informed that I am using some kind of 'anonimiser'.
As I can access any other site I wish to go to, I assume I am showing my IP. But, I am not showing it to this site.
Can I get into the router and ensure that I am always showing my IP, or is there some other way of doing this?
Otherwise, I believe there must be some kind of error in their software. Explaining that, will not be easy.

[#2]

goto google.co.uk and enter "whats my ip" as a search
that will show you your external ip address that is sent to web sites.

[#3]

Thanks hairy, but that doesn't answer the question.
I am no wiser.

[#4]

Do you get the same message in another browser?

[#5]

You asked what your external ip was, it is always shown to sites unless you are visiting via a proxy.
Nothing in your router setup will change this.

[#6]

Are you using Google Chrome on a Google android device (eg Nexus 7)? That sends HTTP requests via a compression proxy. The headers include "Forwarded For" which supplies the real IP, but the receiving end would have to do a special check for that.

[#7]

Try disconnecting/reconnecting. Someone who previously had your IP might have been using it as a ToR exit node or similar.