Can you please share a screenshot of your VCSA settings?
And please be sure that there is no IP conflict, once we had the same problem, but not with "No Compatible Network Adapter" error, we could ping our VCSA IP address but we could not connect to the web interface, so by checking ARP we found out that we are connecting to a wrong MAC address, so we traced that MAC and found the problem.
Moderator: Thread moved to the vCenter Server area.
are you able to log in to the vCSA?
if so, try pinging the default gateway and check for connectity issues
the 503 error means there was an issue starting services on the vCSA appliance (most common the VPXA or the vsphere client)
taking a guess there is a duplicate ip issue in the network