Exclude Login Authentication from One DC

[SolarPanda]

HI MS Experts, I have a pool of DC that receive replication from forest. When user login a application server, the server connects to a DC from the pool to authenticate user login via LDAP. My goal is exclude one of the DC from the pool, which means doesn't authenticate user, but still able to receive replication. i tried to point the subnets to designate DC, also tried to lower the priority of that one DC under TCP -> LDAP. Neither was working. What else could i try?

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