To resolve this issue, NIC can be changed from E1000 to VMXNET3 using this procedure:
1) open vSphere client and make sure that VMware guest tools are installed and up to date
a. if there are no VMware Guest Tools then install them. Reboot may be required
2) stop the Core service gracefully, so no transfers will be initiated during the process
3) right-click VM, Edit Settings
a. select existing NIC and write down its parameters, like VLAN and tag (if used)
b. click on Add and select Ethernet Adapter. Select VMXNET3 and fill fields VLAN and tag with the same values
c. click on OK
4) using vSphere console session, access OS, open Network Adapters
a. right-click 1st NIC, Properties, select TCP/IP v4, Properties. Write down IP parameters (usually static). Set them to "obtain automatically"
b. right click new VMXNET3 NIC, Properties, TCP/IP v4, Properties. Fill written down values there
5. make sure that Core machine is accessible remotely (ping, RDP)
6. right-click VM, Edit Settings, select 1st NIC and click on Remove
7. start the Core service back
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