Hi Haris,
1) Check if you are on the server's network.
2) Check if the external access to opendoc ids is enabled.
3) Try using SAP BO Mobile for viewing the dashboard.
Which version of SAP Dashboards are you following?
In SAP Dashboards SP5, we have Mobility compatibility view where you can check which components in your dashboard are compatible to be viewed on Mobile.
Currently, not all the components are supported in SAP BO Mobile.
Regards,
Bala.