KB ID 0001664
Problem
I had this problem (on sphere 6.7) the other day when trying to deploy some OVA files on my test network.
Solution
Well as stated elsewhere I tried reconnecting to my vCenter using its FQDN, this didn’t solve the problem, using Flash or HTML5 didn’t cure the problem either. What did cure the problem was using a different browser! I switched from IE to Chrome and it worked fine.
Update: I Also cured this problem by using Microsoft Edge (The new chromium based one).
Related Articles, References, Credits, or External Links
VMware vSphere – How to Import and Export OVF and OVA Files
VMware: Export a VM to OVA With PowerCLI
VMware: ISO Upload or Deploy OVA Fails ‘Undetermined Reason’