High (100%) CPU usage after connection to IIS site, that is not Remobject Server.
Maybe bug will reproduce on other Web servers.
For test you can use your MegaClient for .NET to tcp://www.remobjects.com:80/bin as example.
I tested with 18.104.22.1683
2008 R2, 2012 R2;
Looks like bug is not reproduced, when PC/server is under NAT. Only when server/pc direct connected to the internet or IIS in local network.