An administrator is upgrading Files from version 3.7 to 4.1 in the highly secured environment the pre-upgrade check fail with below error:
FileServer preupgrade check failed with cause (s) Sub task poll timed out
What initial troubleshooting step should the administrator take?
One of the possible causes of a failed pre-upgrade check for Files is network connectivity issues between the FSVMs. The administrator should verify that there are no firewall rules or network policies that block the communication between the FSVMs on ports 22 (SSH), 9440 (HTTPS), and 2009 (RPC). The administrator can use tools such as ping, traceroute, and telnet to test the connectivity between the FSVMs. Reference: Nutanix Support Portal - Troubleshooting Nutanix Files Upgrade Issues
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