When I try to access the Helm control panel, I get the following error in Internet Explorer:
Bad Request (Invalid Hostname)
An error indicates that you are trying to access Helm from a site different to the one set up in the Configuration Tool.
Open the Configuration Tool and choose the Control Panel Website tab. In there, it will give you the current details of the site that Helm is set up on, including port.
So, for example, if the host header is "my-control-panel.co.uk" and the port was 8086, then to access Helm you should go to: http://my-control-panel.co.uk:8086 . Trying to access it from other locations such as http://localhost:8086 may not work, and may give the error mentioned above.