AD Multi-NIC Misconfiguration Causing LDAP Query Failures and RPC Errors — What Vendors Missed and How We Fixed It
AD Multi-NIC Misconfiguration Causing LDAP Query Failures and RPC Errors — What Vendors Missed and How We Fixed It Environment: Active Directory server with multiple NICs (Multi-NIC configuration) Other servers in the environment: single NIC VMware Horizon View VDI environment joined to the same domain Symptom Servers attempting LDAP queries against the AD server were intermittently failing. Symptoms included: LDAP query timeouts RPC errors on domain-joined servers VDI: VM provisioning failures and user assignment errors in Horizon View DB cluster: inability to resolve domain-joined DB servers for cluster connectivity checks The failures were inconsistent — some queries succeeded, others did not — which made the root cause difficult to isolate. What We Tried First We opened an SR with the solution vendor. They could not identify the cause. We escalated to Microsoft and worked through the issue collaboratively. That's where the actual root cause was found. Th...