OMI web client

I am trying to access OMI web client on a remote node, but it is not opening it keeps loading. On the GR it opens perfectly. The node I am trying to access OMI web Client with I have installed the ASB root certificate and it's on the same network as the GR. I am using Edge and Mozilla fire fox as the browser. 

what could be the issue ? This is the error I am getting.