Hello Cisco, I can confirm that I have the exact same issue. Have a Esxi Server connecting to Qnap TS 809 pro for NFS shares. Took me about 8 hours!!! to discover that the Switch is causing the troubles!!! IT's not the first thing to think that a switch could be causing such troubles! After creating to Ubuntu virtual machines on our Esxi server and the could connect to each other using NFS but not connect to my Qnap (using the switch...) I got a suspicion that the Switch was causing the troubles!!! going to downgrade the switch and hope it will be fixed!!!
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