This is most likely an issue with IE Security.
Please add ivrnet.com to your safe sites within IE Security Settings.
Follow these steps -
Open up your Settings within your browser - most have it on the top right hand corner of your screen
Next - from the drop down listing choose - Internet Options
Then on this pop up screen - choose Security, Trusted Sites and then click Sites as shown below
Enter ivrnet.com as a trusted site - and click ADD
Then click Close
Try logging in again and the issue should be resolved.