Suddenly page stops loading and says site can't be reached:
Any thoughts, why this is happening.
Your error is caused by an incorrect DNS server configuration.
This error is most often caused by having no connection to the Internet or a misconfigured network. It can also be caused by an unresponsive DNS server or a firewall preventing Google Chrome from accessing the network.
Source: What is Dns_probe_finished_nxdomain?
This happens ONLY when I try to access the vCenter Server through the host machine (my laptop).
This makes sense because
vcsa.dc.local, is more than likely defined as 127.0.0.1, within the VM running the vCenter Server Appliance.
You need to make sure the VCSA VM DNS is configured to your intranet DNS server. You had to import the VM into the cluster, so you should have access to the console, which means you can configure the VM.
Source: Configure the DNS, IP Address, and Proxy Settings
VMware vSphere 6.5