Can't connect Ontap

Hi,

I'm building NetApp (fas2750) for the first time,

but I'm having trouble with the first step and can't move on.

I connected to the management port of netapp from the terminal,

entered the cluster management IP and the node management IP on the ontap web browser,

and committed.
As a result, on the browser, "The server may not be processing the request. It cannot be determined whether the processing is completed."

After that, I couldn't access the ontap web browser anymore.

But ping is responsive.

Can you tell me what to do?

Thanks