this morning, the Events log of vSphere reports an error "Cannot login admin@email@example.com where xxx.yyy.zzz.www is the IP Address of VIN. The user used for discovery is another and VIN works great.
A few days ago vCOPS also showed problems connecting to vCenter and I discovered that the problem depended on that account. In fact you disconnetteva randomly showing in gray all the objects on the vSphere UI. When I changed user interface Admin everything is back to normal, but now I have a similar problem with VIN.
Any suggestions? Many thanks!