Intermittent network failures when communicating to the VMware host. The errors can vary but all have some variation of:
“Error observed by underlying BIO: No such file or directoryDetail: 'SSL connect failed in tcp_connect()', endpoint:”
Guest processing credentials test will also fail over VIX with this error, and you may get a pop up error bellow when editing the Vsphere host:
But on a second try it will continue.