Esxi 4.1 host disconnecting from vCenter after about a minute

Hi,

I have a server and that’s running esxi 4.1 with a real IP address.

Im using one of its virtual machines to run vCenter with NAT IP address.

Every min or so the host disconnects from the vCenter.

Im looking for a solution to this problem for 3 day and cant find one that will solve it!!

I know it’s a NAT problem because when I assign a real IP address to the vCenter machine, the connection is solid!!

The things ive done so far:

1. Open all ports on the firewall.
2. Configured vpxa.cfg on the host to: <serverIp>[vCenter NAT_IP_address]</serverIP>
                                                      <preserveServerIp>true</preserveServerIp>
3. The Manuals say to do: “service vmware-vpxa restart” but I always get: “not found” (I cant understand why I don’t have this option or any service commands) so I did service.sh restart.

To configure the host im using PUTTY.

Please please please help my….

Many thanks ofer.