Deleting the Storage Provider is not possible, as the Storage Providers are not yet added at this stage. This error message occurs right away in the moment when you navigate to "Storage Providers" in the vSphere Client.
When I am using the WebClient, the error message will be "Cannot connect to Storage management service".
Rebooting the vCenter wont help. I am having this issue with 2 different VASA Providers, looks like a vCenter Server issue.
Has anybody been able to solve it?