All my ubuntu clients are offline, but windows clients are online,why?

  I have 3 ubuntu   and 4  windows computers with zerotier installed,They worked normally two days ago,But  since two days ago, all ubuntu zerotier_clients can't work at same time, only windows zerotier_clients worked normally.
 When i run "zerotier-cli info" on ubuntu,It still show " ‌‍‍‏**200 info fd45f57610 1.10.1 ONLINE**",But i can't ping other peers. In my ZeroTierCentral setup page,all my ubuntu zerotier_client's LastSeen is "1D22H34M".
Is there somthing wrong with the linux clients?
Help me please!

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