The Web logon agent was designed for use with IIS 6.0, it can be modified to support to IIS 7.0. However IIS 8.0 is completely untested.
At this time the use of IIS 8.0 is not supported with this agent.
If you have any questions or need some help, we would be happy to assist. Open a case at help.scorpionsoft.com or send an email to email@example.com.