vSphere client connection to esxi 6 - error "the operation has timed out"

[djustin7]

VI Connection to esxi 6 from specific Windows client machines fails with below error:

1. It has been working before.
2. Basic checks done and didn't find any issues with networks.
3. Increasing the time-out value also didn't help

What could be the possible cause of this issue?

Thanks.

[daphnissov]

If it's worked before but not now then something has changed. Begin with basic network troubleshooting steps followed by other verification of ESXi's availability like SSH and web comm.

[djustin7]

Update : Setting the time-out value higher than 60 seconds worked. As per this KB. VMware Knowledge Base

Pending investigation : Why it takes long to authenticate when there is only the default local users, no domain authentication is configured.

[daphnissov]

You'll honestly be a lot better off not using the C# client and instead using the HTML5 embedded host client.

[djustin7]

Sure thing to do, just upgraded to new versions of esxi's and will start using html connection.

Thanks.

[daphnissov]

You don't even need to do that. Just install the VIB on your 6.0 host and begin using the HTML5 client instead.