# End User Problem Troubleshooting

If some errors occur after NGINX Wallarm node installation, check this troubleshooting guide to address them. If you did not find relevant details here, please contact [Wallarm technical support](mailto:support@wallarm.com).

## User cannot download file

If your file download scenarios fail after installing a filter node, the issue is in the request size exceeding the limit set in the `client_max_body_size` directive in the Wallarm configuration file.

Change the value in `client_max_body_size` in the directive `location` for the address that accepts the file uploads. Changing only the `location` value protects the main page from getting large requests.

Change the value in `client_max_body_size`:

1. Open for editing the `/etc/nginx/sites-enabled/default` (`/etc/nginx/http.d/default.conf` if running the Docker container) file.
2. Put in the new value:

	```
	location /file/upload {
	 client_max_body_size 16m;
	}
	```

	`/file/upload` is the address that accepts the file uploads.

Detailed directive description is available in the [official NGINX documentation](https://nginx.org/en/docs/http/ngx_http_core_module.html#client_max_body_size).