diff --git a/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/JsonHandlerRegistry.java b/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/JsonHandlerRegistry.java
index 4ddc45c..386e85e 100644
--- a/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/JsonHandlerRegistry.java
+++ b/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/JsonHandlerRegistry.java
@@ -42,12 +42,14 @@ import server.logic.ws_protocol.JSON.handlers.userParams.entyties.Net_GetUserPar
 import server.logic.ws_protocol.JSON.handlers.userParams.entyties.Net_ListUserParams_Request;
 import server.logic.ws_protocol.JSON.handlers.userParams.entyties.Net_UpsertUserParam_Request;
 
-// --- subscriptions ---
-
 // --- NEW: connections friends lists ---
 import server.logic.ws_protocol.JSON.handlers.connections.Net_GetFriendsLists_Handler;
 import server.logic.ws_protocol.JSON.handlers.connections.entyties.Net_GetFriendsLists_Request;
 
+// --- NEW: Ping ---
+import server.logic.ws_protocol.JSON.handlers.system.Net_Ping_Handler;
+import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_Ping_Request;
+
 import java.util.Map;
 
 /**
@@ -80,7 +82,10 @@ public final class JsonHandlerRegistry {
             Map.entry("ListUserParams",     new Net_ListUserParams_Handler()),
 
             // --- connections ---
-            Map.entry("GetFriendsLists",    new Net_GetFriendsLists_Handler())
+            Map.entry("GetFriendsLists",    new Net_GetFriendsLists_Handler()),
+
+            // --- system ---
+            Map.entry("Ping",               new Net_Ping_Handler())
 
             // --- subscriptions ---
 //            Map.entry("ListSubscribedChannels", new Net_GetSubscribedChannels_Handler())
@@ -109,9 +114,11 @@ public final class JsonHandlerRegistry {
             Map.entry("GetUserParam",       Net_GetUserParam_Request.class),
             Map.entry("ListUserParams",     Net_ListUserParams_Request.class),
 
-
             // --- connections ---
-            Map.entry("GetFriendsLists",    Net_GetFriendsLists_Request.class)
+            Map.entry("GetFriendsLists",    Net_GetFriendsLists_Request.class),
+
+            // --- system ---
+            Map.entry("Ping",               Net_Ping_Request.class)
     );
 
     private JsonHandlerRegistry() { }
diff --git a/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/Net_Ping_Handler.java b/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/Net_Ping_Handler.java
new file mode 100644
index 0000000..e106a41
--- /dev/null
+++ b/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/Net_Ping_Handler.java
@@ -0,0 +1,31 @@
+package server.logic.ws_protocol.JSON.handlers.system;
+
+import server.logic.ws_protocol.JSON.ConnectionContext;
+import server.logic.ws_protocol.JSON.entyties.Net_Request;
+import server.logic.ws_protocol.JSON.entyties.Net_Response;
+import server.logic.ws_protocol.JSON.handlers.JsonMessageHandler;
+import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_Ping_Request;
+import server.logic.ws_protocol.JSON.handlers.system.entyties.Net_Ping_Response;
+import server.logic.ws_protocol.WireCodes;
+
+/**
+ * Ping — keep-alive.
+ * В ответ кладём только ts (текущее время сервера в мс).
+ */
+public class Net_Ping_Handler implements JsonMessageHandler {
+
+    @Override
+    public Net_Response handle(Net_Request baseRequest, ConnectionContext ctx) {
+        Net_Ping_Request req = (Net_Ping_Request) baseRequest;
+
+        Net_Ping_Response resp = new Net_Ping_Response();
+        resp.setOp(req.getOp());            // "Ping"
+        resp.setRequestId(req.getRequestId());
+        resp.setStatus(WireCodes.Status.OK);
+
+        // ничего не проверяем, просто отдаём серверное время
+        resp.setTs(System.currentTimeMillis());
+
+        return resp;
+    }
+}
\ No newline at end of file
diff --git a/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/entyties/Net_Ping_Request.java b/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/entyties/Net_Ping_Request.java
new file mode 100644
index 0000000..399f833
--- /dev/null
+++ b/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/entyties/Net_Ping_Request.java
@@ -0,0 +1,21 @@
+package server.logic.ws_protocol.JSON.handlers.system.entyties;
+
+import server.logic.ws_protocol.JSON.entyties.Net_Request;
+
+/**
+ * Ping:
+ * {
+ *   "op": "Ping",
+ *   "requestId": "req-1",
+ *   "payload": { "ts": 1700000000000 }
+ * }
+ *
+ * Сервер ничего не проверяет, поле ts можно слать любое.
+ */
+public class Net_Ping_Request extends Net_Request {
+
+    private long ts;
+
+    public long getTs() { return ts; }
+    public void setTs(long ts) { this.ts = ts; }
+}
\ No newline at end of file
diff --git a/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/entyties/Net_Ping_Response.java b/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/entyties/Net_Ping_Response.java
new file mode 100644
index 0000000..9f443cd
--- /dev/null
+++ b/shine-server-net-protocol/src/main/java/server/logic/ws_protocol/JSON/handlers/system/entyties/Net_Ping_Response.java
@@ -0,0 +1,20 @@
+package server.logic.ws_protocol.JSON.handlers.system.entyties;
+
+import server.logic.ws_protocol.JSON.entyties.Net_Response;
+
+/**
+ * Pong-ответ:
+ * {
+ *   "op": "Ping",
+ *   "requestId": "req-1",
+ *   "status": 200,
+ *   "payload": { "ts": 1700000000123 }
+ * }
+ */
+public class Net_Ping_Response extends Net_Response {
+
+    private long ts;
+
+    public long getTs() { return ts; }
+    public void setTs(long ts) { this.ts = ts; }
+}
\ No newline at end of file