One device can´t access ZeroTier network


I have set up a ZeroTier network few months ago… all working… yesterday the router had a problem and needed some maintainence.
after that I could connect to ZT network from mobile like usual, but from my laptop not, even it tell´s me Status OK. I deleted the laptop from ZeroTier network and manually added it, but no success.

Any Idea, why only ONE DEVICE can´t connect?
Firewall and so on couldn´t be the problem, because before yesterdays problems I could connect from every device!! I have 6 devices in the ZT network, all working, until now…
Also I can connect from the laptop to another ZT network, so it should be a routing-problem, but what?! :frowning:

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