diff --git a/ydb/core/mon/mon.cpp b/ydb/core/mon/mon.cpp
index de7d94312f37..2b26971ec752 100644
--- a/ydb/core/mon/mon.cpp
+++ b/ydb/core/mon/mon.cpp
@@ -1450,7 +1450,7 @@ NMonitoring::IMonPage* TMon::RegisterActorPage(TRegisterActorPageFields fields)
         fields.PreTag,
         fields.ActorSystem,
         fields.ActorId,
-        fields.AllowedSIDs ? fields.AllowedSIDs : Config.AllowedSIDs,
+        (fields.AllowedSIDs || !fields.UseFallbackSIDs) ? fields.AllowedSIDs : Config.AllowedSIDs,
         fields.UseAuth ? Config.Authorizer : TRequestAuthorizer(),
         fields.MonServiceName);
     if (fields.Index) {
diff --git a/ydb/core/mon/mon.h b/ydb/core/mon/mon.h
index e27fece95954..c2027baaedaa 100644
--- a/ydb/core/mon/mon.h
+++ b/ydb/core/mon/mon.h
@@ -61,6 +61,7 @@ class TMon {
         TActorId ActorId;
         bool UseAuth = true;
         TVector<TString> AllowedSIDs;
+        bool UseFallbackSIDs = true;
         bool SortPages = true;
         TString MonServiceName = "utils";
     };
diff --git a/ydb/core/viewer/viewer.cpp b/ydb/core/viewer/viewer.cpp
index 0a85e1e0671a..3556b6393f83 100644
--- a/ydb/core/viewer/viewer.cpp
+++ b/ydb/core/viewer/viewer.cpp
@@ -92,13 +92,15 @@ class TViewer : public TActorBootstrapped<TViewer>, public IViewer {
                 .RelPath = "viewer/whoami",
                 .ActorSystem = ctx.ActorSystem(),
                 .ActorId = ctx.SelfID,
-                .UseAuth = false,
+                .UseAuth = true,
+                .UseFallbackSIDs = false,
             });
             mon->RegisterActorPage({
                 .RelPath = "viewer/json/whoami", // temporary handling of old paths
                 .ActorSystem = ctx.ActorSystem(),
                 .ActorId = ctx.SelfID,
-                .UseAuth = false,
+                .UseAuth = true,
+                .UseFallbackSIDs = false,
             });
             mon->RegisterActorPage({
                 .Title = "Viewer",