diff -r 33ce525e85ff -r 87aa45c64f8f src/network/network.cpp
--- a/src/network/network.cpp	Tue Jan 30 17:19:58 2007 +0000
+++ b/src/network/network.cpp	Tue Jan 30 17:22:56 2007 +0000
@@ -250,9 +250,10 @@
 	}
 
 	switch (res) {
-		case NETWORK_RECV_STATUS_DESYNC:   errorno = NETWORK_ERROR_DESYNC; break;
-		case NETWORK_RECV_STATUS_SAVEGAME: errorno = NETWORK_ERROR_SAVEGAME_FAILED; break;
-		default:                           errorno = NETWORK_ERROR_GENERAL; break;
+		case NETWORK_RECV_STATUS_DESYNC:          errorno = NETWORK_ERROR_DESYNC; break;
+		case NETWORK_RECV_STATUS_SAVEGAME:        errorno = NETWORK_ERROR_SAVEGAME_FAILED; break;
+		case NETWORK_RECV_STATUS_NEWGRF_MISMATCH: errorno = NETWORK_ERROR_NEWGRF_MISMATCH; break;
+		default:                                  errorno = NETWORK_ERROR_GENERAL; break;
 	}
 	// This means we fucked up and the server closed the connection
 	if (res != NETWORK_RECV_STATUS_SERVER_ERROR && res != NETWORK_RECV_STATUS_SERVER_FULL &&
@@ -282,6 +283,7 @@
 		STR_NETWORK_ERR_CLIENT_SAVEGAME,
 		STR_NETWORK_ERR_CLIENT_CONNECTION_LOST,
 		STR_NETWORK_ERR_CLIENT_PROTOCOL_ERROR,
+		STR_NETWORK_ERR_CLIENT_NEWGRF_MISMATCH,
 		STR_NETWORK_ERR_CLIENT_NOT_AUTHORIZED,
 		STR_NETWORK_ERR_CLIENT_NOT_EXPECTED,
 		STR_NETWORK_ERR_CLIENT_WRONG_REVISION,