diff --git a/grub-core/net/net.c b/grub-core/net/net.c
index 2b6771523..9f09f8e48 100644
--- a/grub-core/net/net.c
+++ b/grub-core/net/net.c
@@ -1521,7 +1521,8 @@ grub_net_fs_close (grub_file_t file)
       grub_netbuff_free (file->device->net->packs.first->nb);
       grub_net_remove_packet (file->device->net->packs.first);
     }
-  file->device->net->protocol->close (file);
+  if (!file->device->net->broken)
+    file->device->net->protocol->close (file);
   grub_free (file->device->net->name);
   return GRUB_ERR_NONE;
 }
@@ -1744,7 +1745,10 @@ grub_net_seek_real (struct grub_file *file, grub_off_t offset)
     file->device->net->stall = 0;
     err = file->device->net->protocol->open (file, file->device->net->name);
     if (err)
-      return err;
+      {
+	file->device->net->broken = 1;
+	return err;
+      }
     grub_net_fs_read_real (file, NULL, offset);
     return grub_errno;
   }
@@ -1753,6 +1757,9 @@ grub_net_seek_real (struct grub_file *file, grub_off_t offset)
 static grub_ssize_t
 grub_net_fs_read (grub_file_t file, char *buf, grub_size_t len)
 {
+  if (file->device->net->broken)
+    return -1;
+
   if (file->offset != file->device->net->offset)
     {
       grub_err_t err;
diff --git a/grub-core/net/tftp.c b/grub-core/net/tftp.c
index ebbafe7a1..ee305e18a 100644
--- a/grub-core/net/tftp.c
+++ b/grub-core/net/tftp.c
@@ -400,6 +400,7 @@ tftp_open (struct grub_file *file, const char *filename)
     {
       grub_net_udp_close (data->sock);
       grub_free (data);
+      file->data = NULL;
       return grub_errno;
     }
 
diff --git a/include/grub/net.h b/include/grub/net.h
index db21e792f..a64a04cc8 100644
--- a/include/grub/net.h
+++ b/include/grub/net.h
@@ -276,6 +276,7 @@ typedef struct grub_net
   grub_fs_t fs;
   int eof;
   int stall;
+  int broken;
 } *grub_net_t;
 
 extern grub_net_t (*EXPORT_VAR (grub_net_open)) (const char *name);