# Flows disappear after a few hours!

**URL:** <https://discourse.nodered.org/t/flows-disappear-after-a-few-hours/82458>\
**Category:** General\
**Created:** [30 October 2023 06:46 UTC](https://discourse.nodered.org/t/flows-disappear-after-a-few-hours/82458 "2023-10-30T06:46:05Z")\
**Posts on this page:** 1\
**Showing post:** 26

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**Author:** ![jbudd](https://avatars.discourse-cdn.com/v4/letter/j/5f8ce5/32.png) [@jbudd](https://discourse.nodered.org/u/jbudd)\
**Post date:** [1 November 2023 12:44 UTC](https://discourse.nodered.org/t/flows-disappear-after-a-few-hours/82458/26 "2023-11-01T12:44:15Z")

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> [@Olaa](#):
>
> Can you give me tips on firewall that works, allow only some MAC addresses access

I don't think a firewall is the answer.

When I want to securely access my Node-red from anywhere away from home I use Zerotier.  
It's described towards the end of the thread [All flows gone after fresh install](https://discourse.nodered.org/t/all-flows-gone-after-fresh-install/82476/26)

- Setup an account at [zerotier.com](http://zerotier.com) and create a virtual network.
- Install Zerotier on your Node-red computer and any device you want to access it from.
- Tell them the ID of the virtual network.
- Authorise them on [Zerotier.com](http://Zerotier.com).

So my Node-red is on a Rspberry Pi at 192.168.1.11  
If I take my laptop to the pub I can connect to it using IP address 192.168.192.11. It looks like a local IP but in fact it's a secure, encrypted connection between the laptop and Pi.

No jiggery-pokery with the router, **no port forwarding**!

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_[View the full topic](https://discourse.nodered.org/t/flows-disappear-after-a-few-hours/82458)._