diff --git a/src/fios.h b/src/fios.h
index b26fe00925..fc39f63604 100644
--- a/src/fios.h
+++ b/src/fios.h
@@ -92,9 +92,11 @@ enum FileSlots {
 	/** First slot usable for (New)GRFs used during the game. */
 	FIRST_GRF_SLOT =  2,
 	/** Last slot usable for (New)GRFs used during the game. */
-	LAST_GRF_SLOT  = 63,
+	LAST_GRF_SLOT  = 255,
 	/** Maximum number of slots. */
-	MAX_FILE_SLOTS = 64
+	MAX_FILE_SLOTS = 256,
+	/** Maximum number of slots for network game */
+	MAX_FILE_SLOTS_IN_NETWORK = 63
 };
 
 /** Mode of the file dialogue window. */
diff --git a/src/network/network_gui.cpp b/src/network/network_gui.cpp
index 013b375bda..8cadcda6be 100644
--- a/src/network/network_gui.cpp
+++ b/src/network/network_gui.cpp
@@ -31,6 +31,8 @@
 #include "../core/geometry_func.hpp"
 #include "../genworld.h"
 #include "../map_type.h"
+#include "../newgrf.h"
+#include "../error.h"
 
 #include "../widgets/network_widget.h"
 
@@ -1177,6 +1179,10 @@ struct NetworkStartServerWindow : public Window {
 			}
 
 			case WID_NSS_GENERATE_GAME: // Start game
+				if (CountSelectedGRFs (_grfconfig_newgame) >= MAX_FILE_SLOTS_IN_NETWORK) {
+					ShowErrorMessage(STR_NEWGRF_ERROR_TOO_MANY_NEWGRFS_LOADED, INVALID_STRING_ID, WL_ERROR);
+					break;
+				}
 				_is_network_server = true;
 				if (_ctrl_pressed) {
 					StartNewGameWithoutGUI(GENERATE_NEW_SEED);
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index c9a78deb90..20c88e4a76 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -9299,3 +9299,16 @@ void LoadNewGRF(uint load_index, uint file_index)
 	_tick_counter = tick_counter;
 	_display_opt  = display_opt;
 }
+
+/**
+ * Returns amount of user selected NewGRFs files.
+ */
+int CountSelectedGRFs(GRFConfig *grfconf)
+{
+	int i = 0;
+
+	/* Find last entry in the list */
+	for (const GRFConfig *list = grfconf; list != NULL; list = list->next, i++) {
+	}
+	return i;
+}
diff --git a/src/newgrf.h b/src/newgrf.h
index 752873a60e..d0d64d35ec 100644
--- a/src/newgrf.h
+++ b/src/newgrf.h
@@ -195,5 +195,6 @@ bool GetGlobalVariable(byte param, uint32 *value, const GRFFile *grffile);
 
 StringID MapGRFStringID(uint32 grfid, StringID str);
 void ShowNewGRFError();
+int CountSelectedGRFs(GRFConfig *grfconf);
 
 #endif /* NEWGRF_H */
diff --git a/src/openttd.cpp b/src/openttd.cpp
index c149ebbd4d..e16cad7e93 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -56,6 +56,7 @@
 #include "core/backup_type.hpp"
 #include "hotkeys.h"
 #include "newgrf.h"
+#include "newgrf_commons.h"
 #include "misc/getoptdata.h"
 #include "game/game.hpp"
 #include "game/game_config.hpp"
@@ -845,6 +846,13 @@ int openttd_main(int argc, char *argv[])
 	DriverFactoryBase::SelectDriver(musicdriver, Driver::DT_MUSIC);
 	free(musicdriver);
 
+	// Check if not too much GRFs are loaded for network game
+	if (dedicated && CountSelectedGRFs( _grfconfig ) >= MAX_FILE_SLOTS_IN_NETWORK) {
+		DEBUG(net, 0, "Too many GRF loaded. Max %d are allowed.\nExiting ...", MAX_FILE_SLOTS_IN_NETWORK);
+		ShutdownGame();
+		goto exit_normal;
+	}
+
 	/* Take our initial lock on whatever we might want to do! */
 	_modal_progress_paint_mutex->BeginCritical();
 	_modal_progress_work_mutex->BeginCritical();