An error occurred while opening a virtual disk. Verify that the converter server and the running source machines have a network access to the source and destination ESX/ESXi hosts

Hi

I uses the newest version of VMware Converter, and got this error:

An error occurred while opening a virtual disk. Verify that the converter server and the running source machines have a network access to the source and destination ESX/ESXi hosts

I can reach the host from the source server on ports 443 and 902.

I have also tried to dettach an host and attach it again, to be sure that I accept the thumbprint.

But I still gets this error.

Is there anyone that knows what I can do to fix this?