Forget my app issue - I had a VPN running on my phone which was obviously blocking some connections. Temporarily disabling it fixed it.
Device I'm connecting from is a wired PC so I guess that explains teh resolution issue.
Thanks - think I'm all good for now. Will use the IP workaround or a local hosts entry for admin via browser (I've reserved a DHCP IP address for the disc on my router so it stays fixed).