Unable to open vCenter web console (Flash/HTML) after migrating from 6.5.X to 6.7.X

While opening Flash client (https://vcsa.domain.local/vsphere-client/), you may see error while opening Flash client.

An internal error has occurred-No state found from reature NativeBrowserFileTranster
Reloading the client is recommended so as to clear any problems left by this error.
click Yes to reload the vSphere web client.
Show error stack.

When we click on Yes then you see following stack.

Error Stack
ArgumentError No state found tor reature NativeBrowserFileTranster
at com vmware nexutil configuration: FeatureStateManagemsEnabled0
at conv vmware vmrc:
at conv vmware UtiLS/init()
at conv vmware ui ut":
at com vmware ui ut":
at com vmware nexutil proxies: ConfigurationServiceProxylgetConfiguration()
at conv vmware nexutil proxies ( ConfigurationServicePr0KylgetAProperties()
at conv vmware util: CommonApplnitialZernoadWebclientConfig()
at conv vmware ui util::
at conv vmware
at UlMediator/onBackendEndpointsSessionlnitialized()
at com vmware nexutil proxies: Baseproxy/notity()
at conv vmware nexutil
at com vmware nexutil proxies: : BaseProMonlnvocatimComplete()
at Operationlnvoker'resultResponseForRequest()
at Operationlnvoker/result()
at mx.rpc: :AsyncTokemhttp:/twww.adobe
my rpc events ResultEvenVhttp:/Äwmadobe_com.Q006.mex/mx/internal::callT*enResponders()
at mx.rpc: :AbstractOperatiomhttp:lhmwadobecomQOOömex/mVinternal::dispatchRpcEvent()
at mx.rpc: : Responder/resut()
at NetConnectimMessageResponderjresutHandIer()


HTML client (https://vcsa.domain.local/ui/) and VAMI page (https://vcsa.domain.local:5480) just load spinning wheel with blank screen and doesn’t load inventory.

This issue comes when vCenter migration from old VM to new VM and browser have old cache information. To isolate the issue try opening vCenter URL from any other workstation. To fix the issue clear browser cache OR reset it to default.

For example, for Google Chrome following steps can be carried out:-
Settings \ Expand Advanced \ section Reset and clean up then Restore settings to their original defaults.