I am new here, can anyone help me with the step how to do upgrade the vmware vCenter 5.5 to 6.5(6.0) in Centos7 machine. 

How to upgrade VMware VCenter from 5.5 to 6.5(6.0) in Centos7

I have a host machine Ubuntu 20.04 with installed KVM.

The first virtual machine is VMware ESXi host. The second one is Windows Server 2019. I use the second machine only for installing vCenter.

I can easily install any virtual machines inside the ESXi. Thus, the nested virtualization works fine.

During the initial step of installation vCenter Appliance, I get the error message: "An existing connection was forcibly closed by the remote host: The connection is terminated by the remote end with reset packet. Usually, this is a sign of a network problem, timeout, or service overload."

I have normal connectivity between Windows Server 2019 and ESXi machine. I have the ability to use the browser on the Windows Server and manage ESXi through WEB client. I disabled Netfilter on the Linux KVM bridge. It didn't get helpful. I tried to install vCenter using FQDN and another time with a direct IP address. I tried to use libvirt networking with different modes: NAT, Routed. The result was the same, the initial step of vCenter installation crashes.

How to install vCenter Appliance on ESXi above the KVM?

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