After restarting my Synology NAS I'm unable to connect to the Roon Core

When I start any of the Roon clients (Mac, iPad…) I can see my Diskstation showing as ‘Ready’ and a button labelled ‘Connect’. When I click the Connect button, I’m asked for my Roon credentials. After supplying them, it goes on, saying ‘Logging in…’ and then showing me that I’m 'already signed in…
When going back, as the message suggested, I just can log back in again, ending up right at the same message… What am I missing?

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Never mind, just found this post - I’m now back in the music streaming business… phew…