Connection to Storage Server Failed is a server-side error. This error displays whenever the server is incapable of responding.
As the name entails, it is easy to conclude that you are encountering problems with the storage, but that is not always the case. In some scenarios, this error may still appear even if you have sufficient disk space. Consequently, email access is unavailable.
When you encounter this error, we suggest to contact our Technical Support team as there is no definite reason behind the issue unless examined from the backend. We’d be glad to help you!