DC's with {servers not operational error}

DC's with {servers not operational error}

Dear support;
thanks for your help and support,
i have an urgently and great problem with ADmanager, i have 4 DC's with single domain, 2 in my location and the other 2 in diffrent location. and alwayes when i add the 2 dcs that in the other location i rec. the error {servers not operational error} which mean that the servers not correctly connected.
kindly note that i can ping the other servers correctly with names and IPs.
and no ports and closed...
please advice ASAP
thx





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