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Have you ever encountered such situation after login as client or your client reports it to you:

HostBill Docs > OnApp: Client can't view usage graphs > 1.png

If you have suffered from such issues, in Settings->Apps you need to make sure:

that you have (Secure) option ticked, only if you have valid SSL certificate (self-signed doesn't count).
if you're using hostname it is valid, and resolve to your OnApp installation