diff --git a/src/CommonLib/ConnectionPoolManager.cs b/src/CommonLib/ConnectionPoolManager.cs
index 5e001dec..4b35e7c6 100644
--- a/src/CommonLib/ConnectionPoolManager.cs
+++ b/src/CommonLib/ConnectionPoolManager.cs
@@ -73,7 +73,7 @@ public void ReleaseConnection(LdapConnectionWrapper connectionWrapper, bool conn
         }
 
         private bool GetPool(string identifier, out LdapConnectionPool pool) {
-            if (identifier == null) {
+            if (string.IsNullOrWhiteSpace(identifier) || identifier == ".") {
                 pool = default;
                 return false;
             }