Since your isy will be wired and your client is wifi. Have you checked that your isy and client are on the same ip network?
It could be that your wifi router is blocking access to your wired network.
Have you tried pinging the isy from your client?
Have you tried http or https from your client to the isy?
If that fails. Can your client connect with an Ethernet wire to your router?
What error messages are you seeing?