Acropolis Upgrade: Failing at PreUpgrade Check "Failed to connect to Hypervisor management server ip | Nutanix Community
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Running DELL XC630 5 node cluster with ESXi 6.0 / NSX

Trying to use One Click Upgrade to move from NOS 4.5.2 to 4.6.2

PreUpgrade Check fails with "Failed to connect to Hypervisor managment IP X.X.X.1 Failed to connect to Hypervisor managment IP X.X.X.2 Failed to connect to Hypervisor managment IP X.X.X.3 Failed to connect to Hypervisor managment IP X.X.X.5"



x.x.x.1~5 being ESXi IP External addresses



- SSH to all ESXi from all CVM on both Internal and External IP works. (also the reverse connection is working)

- ESXi reboot / Genesis restart done

- fix_host_ssh done

- even updated all ESXi root password on CVM (even though unchanged just to be sure)

- No Alert/Warning under PRISM

- ncc health_checks run_all came out with flying colors.

- Identical setup at DR site having same issue/symptoms



tail -f genesis.out shows:

esx_utils.py:135 Connection to host x.x.x.1 failed x.x.x.1:443 is not a VIM server

host_upgrade_helper.py:655 Error in connecting to local hypervisor



Stumped and hence sending out SOS.

Would really appreciate your support / suggestions.
[solved]

Cause: ESXi host was in a security hardened environment blocking TCP 443

Re-enable the Host Welcome login web page on all ESXi hosts:

vim-cmd proxysvc/add_tcp_service "/" httpsWithRedirect localhost 8309
Thanks for sharing 
For posterity, can you submit a support ticket so we can track this as an enhancement to our product?