[Network and Virtual Switch] NAS web interface no longer accessible.

[Bassdriver]

Hello everyone,

I recently haven’t been able to access the web interface of my NAS through the usual IP address.

NAS: TS-453 Pro

Operating system: QTS 5.2.8.3359

Virtual machine (Home Assistant)

Docker application Paperless

On Port 1, my entire network is connected, including the Fritzbox with the DHCP server. The DHCP server automatically assigns addresses from 192.168.178.100 to 192.168.178.200. I set a static IP for my NAS here (192.168.178.20). On the same port, a virtual machine (Home Assistant) with a static IP address (set in the Fritzbox) 192.168.178.29 is still accessible. The Docker application is no longer accessible.

On Port 2, I have another network where the DHCP server runs on the NAS. This server assigns addresses in the range 10.10.10.2 to 10.10.10.50. When I connect my PC here, I can access the interface via 10.10.10.1 and view the information provided. The routes to and from the Fritzbox in this network used to work. But since the NAS no longer connects to the Fritzbox over Port 1, this unfortunately no longer works.

I receive the following error message when attempting to log into the NAS:

What I’ve tried so far:

Restarted NAS -- Problem not solved

Set standard gateway on Port 1 -- Problem not solved
Turned off virtual machine -- Problem not solved
Direct connection from PC to NAS on Port 1 with static IP -- Problem disappears
Direct connection from NAS to Fritzbox on Port 1 -- Problem not solved
Changed static IP in Fritzbox -- Problem not solved, but the network adapter on the NAS picked up the new IP

What could be the problem? What else can I try?

[Becker2020]

@Bassdriver

What could be the problem?

Hi,

there’s something missing in your settings (red circle).

The system default gateway is missing there. Either set it to “auto” or enter it manually.

Since you’ve already ruled out the cabling, the only other thing I can think of is to manually reinstall QTS.

Or create a ticket with support.

[Bassdriver]

I had already set the default gateway before. But it looks like I removed it again during further testing. I’ve set it again now, but that doesn’t solve the problem.

I hadn’t checked the Spanning Tree Protocol option before, so I’ve enabled it now. That didn’t fix the issue either.

[Becker2020]

Is the NAS connected directly to the Fritzbox or is there a switch in between?

Or is there a block set up under Security?

Or is QuFirewall installed?

One more question about “recently the web interface of my NAS”.

Was an update installed around that time?

[Bassdriver]

Thank you very much for your suggestions about what the issue could be. I found the problem.

The Tailscale app for Home Assistant automatically acts as an exit node/subnet router. This causes errors.

[Becker2020]

Thanks for the feedback