Everytime when I start Xcode 9.3 and go to the report navigator my Xcode Server is disconnected
When I go to the accounts tab in settings it shows me an error.
When I enter the credentials it works. But it seems like Xcode forgets the credentials every time I restart it.
I also went through this question (xcode 9.3 session expires every time i close and re-open Xcode) because it could have been a problem with the keychain. It didn't help though.