Access denied to Cluster IP

[Prashan_Attanay]

I'm getting following error message when I try to access Gaia portal using cluster IP. I tried with Chrome, Firefox and IE web browsers. I can log into active and standby firewalls separately but not to cluster IP.

My colleagues can log into cluster from their IPs. We all are in same IP range. 

Access to <Cluster IP> was denied

You don't have authorization to view this page.

HTTP ERROR 403