--- a/src/network/core/tcp_admin.cpp
+++ b/src/network/core/tcp_admin.cpp
@@ -64,6 +64,11 @@
 		ADMIN_COMMAND(ADMIN_PACKET_SERVER_SHUTDOWN)
 
 		ADMIN_COMMAND(ADMIN_PACKET_SERVER_DATE)
+		ADMIN_COMMAND(ADMIN_PACKET_SERVER_CLIENT_JOIN)
+		ADMIN_COMMAND(ADMIN_PACKET_SERVER_CLIENT_INFO)
+		ADMIN_COMMAND(ADMIN_PACKET_SERVER_CLIENT_UPDATE)
+		ADMIN_COMMAND(ADMIN_PACKET_SERVER_CLIENT_QUIT)
+		ADMIN_COMMAND(ADMIN_PACKET_SERVER_CLIENT_ERROR)
 
 		default:
 			if (this->HasClientQuit()) {
@@ -123,5 +128,10 @@
 DEFINE_UNAVAILABLE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_SHUTDOWN)
 
 DEFINE_UNAVAILABLE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_DATE)
+DEFINE_UNAVAILABLE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_CLIENT_JOIN)
+DEFINE_UNAVAILABLE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_CLIENT_INFO)
+DEFINE_UNAVAILABLE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_CLIENT_UPDATE)
+DEFINE_UNAVAILABLE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_CLIENT_QUIT)
+DEFINE_UNAVAILABLE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_CLIENT_ERROR)
 
 #endif /* ENABLE_NETWORK */

--- a/src/network/core/tcp_admin.h
+++ b/src/network/core/tcp_admin.h
@@ -40,6 +40,11 @@
 	ADMIN_PACKET_SERVER_SHUTDOWN,        ///< The server tells the admin its shutting down.
 
 	ADMIN_PACKET_SERVER_DATE,            ///< The server tells the admin what the current game date is.
+	ADMIN_PACKET_SERVER_CLIENT_JOIN,     ///< The server tells the admin that a client has joined.
+	ADMIN_PACKET_SERVER_CLIENT_INFO,     ///< The server gives the admin information about a client.
+	ADMIN_PACKET_SERVER_CLIENT_UPDATE,   ///< The server gives the admin an information update on a client.
+	ADMIN_PACKET_SERVER_CLIENT_QUIT,     ///< The server tells the admin that a client quit.
+	ADMIN_PACKET_SERVER_CLIENT_ERROR,    ///< The server tells the admin that a client caused an error.
 
 	INVALID_ADMIN_PACKET = 0xFF,         ///< An invalid marker for admin packets.
 };
@@ -54,6 +59,7 @@
 /** Update types an admin can register a frequency for */
 enum AdminUpdateType {
 	ADMIN_UPDATE_DATE,            ///< Updates about the date of the game.
+	ADMIN_UPDATE_CLIENT_INFO,     ///< Updates about the information of clients.
 	ADMIN_UPDATE_END              ///< Must ALWAYS be on the end of this list!! (period)
 };
 
@@ -102,7 +108,8 @@
 	/**
 	 * Poll the server for certain updates, an invalid poll (e.g. not existent id) gets silently dropped:
 	 * uint8   #AdminUpdateType the server should answer for, only if #AdminUpdateFrequency #ADMIN_FREQUENCY_POLL is advertised in the PROTOCOL packet.
-	 * uint32  ID relevant to the packet type.
+	 * uint32  ID relevant to the packet type, e.g.
+	 *          - the client ID for #ADMIN_UPDATE_CLIENT_INFO. Use UINT32_MAX to show all clients.
 	 */
 	DECLARE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_ADMIN_POLL);
 
@@ -161,6 +168,44 @@
 	 */
 	DECLARE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_DATE);
 
+	/**
+	 * Notification of a new client:
+	 * uint32  ID of the new client.
+	 */
+	DECLARE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_CLIENT_JOIN);
+
+	/**
+	 * Client information of a specific client:
+	 * uint32  ID of the client.
+	 * string  Network address of the client.
+	 * string  Name of the client.
+	 * uint8   Language of the client.
+	 * uint32  Date the client joined the game.
+	 * uint8   ID of the company the client is playing as (255 for spectators).
+	 */
+	DECLARE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_CLIENT_INFO);
+
+	/**
+	 * Client update details on a specific client (e.g. after rename or move):
+	 * uint32  ID of the client.
+	 * string  Name of the client.
+	 * uint8   ID of the company the client is playing as (255 for spectators).
+	 */
+	DECLARE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_CLIENT_UPDATE);
+
+	/**
+	 * Notification about a client leaving the game.
+	 * uint32  ID of the client that just left.
+	 */
+	DECLARE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_CLIENT_QUIT);
+
+	/**
+	 * Notification about a client error (and thus the clients disconnection).
+	 * uint32  ID of the client that made the error.
+	 * uint8   Error the client made (see NetworkErrorCode).
+	 */
+	DECLARE_ADMIN_RECEIVE_COMMAND(ADMIN_PACKET_SERVER_CLIENT_ERROR);
+
 	NetworkRecvStatus HandlePacket(Packet *p);
 public:
 	NetworkRecvStatus CloseConnection(bool error = true);

--- a/src/network/network_admin.cpp
+++ b/src/network/network_admin.cpp
@@ -41,6 +41,7 @@
 /** Frequencies, which may be registered for a certain update type. */
 static const AdminUpdateFrequency _admin_update_type_frequencies[] = {
 	ADMIN_FREQUENCY_POLL | ADMIN_FREQUENCY_DAILY | ADMIN_FREQUENCY_WEEKLY | ADMIN_FREQUENCY_MONTHLY | ADMIN_FREQUENCY_QUARTERLY | ADMIN_FREQUENCY_ANUALLY, ///< ADMIN_UPDATE_DATE
+	ADMIN_FREQUENCY_POLL | ADMIN_FREQUENCY_AUTOMATIC,                                                                                                      ///< ADMIN_UPDATE_CLIENT_INFO
 };
 assert_compile(lengthof(_admin_update_type_frequencies) == ADMIN_UPDATE_END);
 
@@ -180,6 +181,66 @@
 	return NETWORK_RECV_STATUS_OKAY;
 }
 
+NetworkRecvStatus ServerNetworkAdminSocketHandler::SendClientJoin(ClientID client_id)
+{
+	Packet *p = new Packet(ADMIN_PACKET_SERVER_CLIENT_JOIN);
+
+	p->Send_uint32(client_id);
+	this->Send_Packet(p);
+
+	return NETWORK_RECV_STATUS_OKAY;
+}
+
+NetworkRecvStatus ServerNetworkAdminSocketHandler::SendClientInfo(const NetworkClientInfo *ci)
+{
+	Packet *p = new Packet(ADMIN_PACKET_SERVER_CLIENT_INFO);
+
+	p->Send_uint32(ci->client_id);
+	p->Send_string(const_cast<NetworkAddress &>(ci->client_address).GetHostname());
+	p->Send_string(ci->client_name);
+	p->Send_uint8 (ci->client_lang);
+	p->Send_uint32(ci->join_date);
+	p->Send_uint8 (ci->client_playas);
+
+	this->Send_Packet(p);
+
+	return NETWORK_RECV_STATUS_OKAY;
+}
+
+NetworkRecvStatus ServerNetworkAdminSocketHandler::SendClientUpdate(const NetworkClientInfo *ci)
+{
+	Packet *p = new Packet(ADMIN_PACKET_SERVER_CLIENT_UPDATE);
+
+	p->Send_uint32(ci->client_id);
+	p->Send_string(ci->client_name);
+	p->Send_uint8 (ci->client_playas);
+
+	this->Send_Packet(p);
+
+	return NETWORK_RECV_STATUS_OKAY;
+}
+
+NetworkRecvStatus ServerNetworkAdminSocketHandler::SendClientQuit(ClientID client_id)
+{
+	Packet *p = new Packet(ADMIN_PACKET_SERVER_CLIENT_QUIT);
+
+	p->Send_uint32(client_id);
+	this->Send_Packet(p);
+
+	return NETWORK_RECV_STATUS_OKAY;
+}
+
+NetworkRecvStatus ServerNetworkAdminSocketHandler::SendClientError(ClientID client_id, NetworkErrorCode error)
+{
+	Packet *p = new Packet(ADMIN_PACKET_SERVER_CLIENT_ERROR);
+
+	p->Send_uint32(client_id);
+	p->Send_uint8 (error);
+	this->Send_Packet(p);
+
+	return NETWORK_RECV_STATUS_OKAY;
+}
+
 /***********
  * Receiving functions
  ************/
@@ -247,6 +308,19 @@
 			this->SendDate();
 			break;
 
+		case ADMIN_UPDATE_CLIENT_INFO:
+			/* The admin is requesting client info. */
+			const NetworkClientInfo *ci;
+			if (d1 == UINT32_MAX) {
+				FOR_ALL_CLIENT_INFOS(ci) {
+					this->SendClientInfo(ci);
+				}
+			} else {
+				ci = NetworkFindClientInfoFromClientID((ClientID)d1);
+				if (ci != NULL) this->SendClientInfo(ci);
+			}
+			break;
+
 		default:
 			/* An unsupported "poll" update type. */
 			DEBUG(net, 3, "[admin] Not supported poll %d (%d) from '%s' (%s).", type, d1, this->admin_name, this->admin_version);
@@ -261,6 +335,67 @@
  */
 
 /**
+ * Notify the admin network of a new client (if they did opt in for the respective update).
+ * @param ci the client info.
+ * @param new_client if this is a new client, send the respective packet too.
+ */
+void NetworkAdminClientInfo(const NetworkClientInfo *ci, bool new_client)
+{
+	ServerNetworkAdminSocketHandler *as;
+	FOR_ALL_ADMIN_SOCKETS(as) {
+		if (as->update_frequency[ADMIN_UPDATE_CLIENT_INFO] & ADMIN_FREQUENCY_AUTOMATIC) {
+			as->SendClientInfo(ci);
+			if (new_client) {
+				as->SendClientJoin(ci->client_id);
+			}
+		}
+	}
+}
+
+/**
+ * Notify the admin network of a client update (if they did opt in for the respective update).
+ * @param ci the client info.
+ */
+void NetworkAdminClientUpdate(const NetworkClientInfo *ci)
+{
+	ServerNetworkAdminSocketHandler *as;
+	FOR_ALL_ADMIN_SOCKETS(as) {
+		if (as->update_frequency[ADMIN_UPDATE_CLIENT_INFO] & ADMIN_FREQUENCY_AUTOMATIC) {
+			as->SendClientUpdate(ci);
+		}
+	}
+}
+
+/**
+ * Notify the admin network that a client quit (if they have opt in for the respective update).
+ * @param client_id of the client that quit.
+ */
+void NetworkAdminClientQuit(ClientID client_id)
+{
+	ServerNetworkAdminSocketHandler *as;
+	FOR_ALL_ADMIN_SOCKETS(as) {
+		if (as->update_frequency[ADMIN_UPDATE_CLIENT_INFO] & ADMIN_FREQUENCY_AUTOMATIC) {
+			as->SendClientQuit(client_id);
+		}
+	}
+}
+
+/**
+ * Notify the admin network of a client error (if they have opt in for the respective update).
+ * @param client_id the client that made the error.
+ * @param error_code the error that was caused.
+ */
+void NetworkAdminClientError(ClientID client_id, NetworkErrorCode error_code)
+{
+	ServerNetworkAdminSocketHandler *as;
+	FOR_ALL_ADMIN_SOCKETS(as) {
+		if (as->update_frequency[ADMIN_UPDATE_CLIENT_INFO] & ADMIN_FREQUENCY_AUTOMATIC) {
+			as->SendClientError(client_id, error_code);
+		}
+	}
+}
+
+/**
  * Send a Welcome packet to all connected admins
  */
 void ServerNetworkAdminSocketHandler::WelcomeAll()

--- a/src/network/network_admin.h
+++ b/src/network/network_admin.h
@@ -44,6 +44,11 @@
 	NetworkRecvStatus SendNewGame();
 	NetworkRecvStatus SendShutdown();
 	NetworkRecvStatus SendDate();
+	NetworkRecvStatus SendClientJoin(ClientID client_id);
+	NetworkRecvStatus SendClientInfo(const NetworkClientInfo *ci);
+	NetworkRecvStatus SendClientUpdate(const NetworkClientInfo *ci);
+	NetworkRecvStatus SendClientQuit(ClientID client_id);
+	NetworkRecvStatus SendClientError(ClientID client_id, NetworkErrorCode error);
 
 	static void Send();
 	static void AcceptConnection(SOCKET s, const NetworkAddress &address);
@@ -63,6 +68,10 @@
 #define FOR_ALL_ADMIN_SOCKETS_FROM(var, start) FOR_ALL_ITEMS_FROM(ServerNetworkAdminSocketHandler, adminsocket_index, var, start)
 #define FOR_ALL_ADMIN_SOCKETS(var) FOR_ALL_ADMIN_SOCKETS_FROM(var, 0)
 
+void NetworkAdminClientInfo(const NetworkClientInfo *ci, bool new_client = false);
+void NetworkAdminClientUpdate(const NetworkClientInfo *ci);
+void NetworkAdminClientQuit(ClientID client_id);
+void NetworkAdminClientError(ClientID client_id, NetworkErrorCode error_code);
 void NetworkAdminUpdate(AdminUpdateFrequency freq);
 
 #endif /* ENABLE_NETWORK */

--- a/src/network/network_server.cpp
+++ b/src/network/network_server.cpp
@@ -284,6 +284,8 @@
 				new_cs->SendErrorQuit(this->client_id, error);
 			}
 		}
+
+		NetworkAdminClientError(this->client_id, error);
 	} else {
 		DEBUG(net, 1, "Client %d made an error and has been disconnected. Reason: '%s'", this->client_id, str);
 	}
@@ -985,6 +987,8 @@
 			}
 		}
 
+		NetworkAdminClientInfo(this->GetInfo(), true);
+
 		/* also update the new client with our max values */
 		this->SendConfigUpdate();
 
@@ -1093,6 +1097,8 @@
 		}
 	}
 
+	NetworkAdminClientError(this->client_id, errorno);
+
 	return this->CloseConnection(NETWORK_RECV_STATUS_CONN_LOST);
 }
 
@@ -1118,6 +1124,8 @@
 		}
 	}
 
+	NetworkAdminClientQuit(this->client_id);
+
 	return this->CloseConnection(NETWORK_RECV_STATUS_CONN_LOST);
 }
 
@@ -1473,6 +1481,8 @@
 	FOR_ALL_CLIENT_SOCKETS(cs) {
 		cs->SendClientInfo(ci);
 	}
+
+	NetworkAdminClientUpdate(ci);
 }
 
 /* Check if we want to restart the map */