Description of problem:

On MTV 2.10, I frequently hit these errors below:

"Providers -> Virtual machines" page: hit "Unable to retrieve virtual machines data."

"Migration plans -> Create migration plan -> Virtual machines" page: hit "No results found"

"Migration plans -> Virtual machines page": hit "Unable to retrieve data"

I installed MTV 2.9.5 on the same OCP cluster with the same vCenter server, I didn't hit these errors

Version-Release number of selected component (if applicable):

MTV2.10.0-16 (IIB: on-pr-7dddf4648448f46ce25774c03529cf5a33ad9f2c) with CNV 4.20.0

How reproducible:

60%

Steps to Reproduce:

1) "Providers -> Virtual machines" page, hit "Unable to retrieve virtual machines data."

2) Refresh the page for several times, the Virtual machines are listed.

3) Migration plans -> Create migration plan -> Virtual machines page, hit "No results found"

4) Refresh the page for several times, the Virtual machines are listed.

5) Migration plans -> Virtual machines page, hit "Unable to retrieve data"

6) Wait for several seconds or refresh the page for several times, the VM is listed

Actual results:

In steps 1,3,5: Hit unexpected error

Expected results:

In steps 1,3,5: No error