dns zone transfer error "clocks are unsynchronized" ?

i have 3 dns servers, 1 master, 2 slaves

i have this problem on one of my slave (but not the other)

it's apparently a problem regarding system time, the slave server in trouble is 7 min faster than the master, is it really a problem et al?

i've tried changing the system time using `date --set="xxx"` with little success but the clock is reset back to default after reboot

now one of my dns slave is broken and i don wanna build those zone files one by one dns zone transfer error

any suggestion is appreciated

 

 

 

 

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