diff --git a/src/Server/ZB.MOM.WW.OtOpcUa.ControlPlane/Coordinators/ConfigPublishCoordinator.cs b/src/Server/ZB.MOM.WW.OtOpcUa.ControlPlane/Coordinators/ConfigPublishCoordinator.cs
index e6cf5ce6..c9c36104 100644
--- a/src/Server/ZB.MOM.WW.OtOpcUa.ControlPlane/Coordinators/ConfigPublishCoordinator.cs
+++ b/src/Server/ZB.MOM.WW.OtOpcUa.ControlPlane/Coordinators/ConfigPublishCoordinator.cs
@@ -30,10 +30,15 @@ public sealed class ConfigPublishCoordinator : ReceiveActor, IWithTimers
     private readonly IDbContextFactory<OtOpcUaConfigDbContext> _dbFactory;
     private readonly TimeSpan _applyDeadline;
     private readonly ILoggingAdapter _log = Context.GetLogger();
-    private readonly Dictionary<NodeId, ApplyAckOutcome> _acks = new();
+    // NodeId equality here is case-insensitive (by Value) to match the case-insensitive ClusterId/
+    // NodeId scoping in DeploymentArtifact.ResolveClusterScope — so an ack from a node whose address
+    // differs only in case still matches its expected-ack entry (SQL collation + DNS are
+    // case-insensitive, so the same node can surface with different casing).
+    private static readonly IEqualityComparer<NodeId> NodeIdComparer = new CaseInsensitiveNodeIdComparer();
+    private readonly Dictionary<NodeId, ApplyAckOutcome> _acks = new(NodeIdComparer);
 
     private DeploymentId? _current;
-    private HashSet<NodeId> _expectedAcks = new();
+    private HashSet<NodeId> _expectedAcks = new(NodeIdComparer);
 
     /// <summary>Gets the timer scheduler for managing apply deadlines.</summary>
     public ITimerScheduler Timers { get; set; } = null!;
@@ -88,7 +93,7 @@ public sealed class ConfigPublishCoordinator : ReceiveActor, IWithTimers
             .AsNoTracking()
             .ToList();
 
-        _expectedAcks = nodeStates.Select(s => NodeId.Parse(s.NodeId)).ToHashSet();
+        _expectedAcks = nodeStates.Select(s => NodeId.Parse(s.NodeId)).ToHashSet(NodeIdComparer);
         foreach (var s in nodeStates.Where(s => s.Status != NodeDeploymentStatus.Applying))
             _acks[NodeId.Parse(s.NodeId)] = s.Status == NodeDeploymentStatus.Applied
                 ? ApplyAckOutcome.Applied
@@ -248,7 +253,7 @@ public sealed class ConfigPublishCoordinator : ReceiveActor, IWithTimers
     private HashSet<NodeId> DiscoverDriverNodes()
     {
         var cluster = Akka.Cluster.Cluster.Get(Context.System);
-        var nodes = new HashSet<NodeId>();
+        var nodes = new HashSet<NodeId>(NodeIdComparer);
         foreach (var member in cluster.State.Members)
         {
             if (member.Status is not (MemberStatus.Up or MemberStatus.Joining)) continue;
@@ -261,4 +266,18 @@ public sealed class ConfigPublishCoordinator : ReceiveActor, IWithTimers
         }
         return nodes;
     }
+
+    /// <summary>Case-insensitive <see cref="NodeId"/> equality (by <see cref="NodeId.Value"/>),
+    /// matching the case-insensitive scoping in <c>DeploymentArtifact.ResolveClusterScope</c> so the
+    /// expected-ack set and incoming acks agree regardless of host-name casing.</summary>
+    private sealed class CaseInsensitiveNodeIdComparer : IEqualityComparer<NodeId>
+    {
+        /// <inheritdoc />
+        public bool Equals(NodeId x, NodeId y) =>
+            string.Equals(x.Value, y.Value, StringComparison.OrdinalIgnoreCase);
+
+        /// <inheritdoc />
+        public int GetHashCode(NodeId obj) =>
+            StringComparer.OrdinalIgnoreCase.GetHashCode(obj.Value ?? string.Empty);
+    }
 }