FaceTime and MacPro and Wired Ethernet Activation

i trying run facetime on macpro 3,1. have mac using wired internet connection.

facetime not activate (signing-in using apple id) unless turn on wifi (and first disabling wired ethernet & rebooting mac).

once have done can run facetime , have activate. however, next time run computer on wired ethernet (which 99.999999% of time) not able use facetime.

dns settings google's 8.8.8.8 & 8.8.4.4 suggested in other threads.

use facetime when wired ethernet active.

have solution?

 

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