Vsphere server not seeing usb drives

My Vsphere esxi 5.5 Server is no longer seeing USB devices.  I shut down the server using the F12 shut down command and switched back on and one of my VMs relies on a USB licence dongle.  I have tried various USB sticks (memory sticks) in all four ports and it seems Vsphere just will not see them.  I tried the lusb command but it shows nothing.
USB is switched on in BIOS and it all worked until I shut down.
Does anyone have any ideas here?

Thanks
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fuzzyfreakAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
can you upload the usb.log?

what version of ESXi 5.5 - build number?

A reminder of how to connect a USB device

HOW TO: Add and Connect a USB Device to a Virtual Machine, hosted on VMware vSphere Hypervisor ESX 4.1 ESXi 4.1, ESXi 5.0
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fuzzyfreakAuthor Commented:
Build 2068190
Above instructions are exactly the way I am doing it.
thanks
usb.log
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
What is the server you are using ?

There does seem to an error in the USB logs.
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fuzzyfreakAuthor Commented:
It is a Dell Poweredge R410.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Are you using the Dell OEM version of ESXi 5.5?
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fuzzyfreakAuthor Commented:
No. we have the VMWare Essentials Kit purchased direct from VMware.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes, that's correct, and you should use the OEM version of ESXi, supplied by Dell for your server.

VMware provides the licensing.

The OEM versions have additional drivers and communication options, which interface with the vendor server.
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fuzzyfreakAuthor Commented:
So I need Dell support to resolve this?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Discussing this issue with Dell and VMware would be advised.

However, USB passthrough can be troublesome.

other options are, to use VM Direct Path I/O to add the USB Controller to the VM.

see here

http://www.vm-help.com/esx40i/VMDirectPath/USB_Setup.php

http://vstorage.wordpress.com/2010/07/15/usb-passthrough-in-vsphere-4-1/

or use...a network attached USB Hub...

http://www.digi.com/products/usb/anywhereusb
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
It would be interesting as a followup, what Dell suggest.
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fuzzyfreakAuthor Commented:
I will speak with Dell. Thanks very much for your help.
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fuzzyfreakAuthor Commented:
Looks like another reboot was all that was needed. I say 'looks' like because in the meantime, I took the pressure off by converting our usb licence key to a soft licence, so USB was no longer needed on the host but I had also noticed that the CDROM was not working either but did after a reboot.

Thanks for all your help.
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fuzzyfreakAuthor Commented:
I give A grades if the expert has given a direct solution.
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