Two sites needed for work show "Server not found"

[pragmaticwaffel]

There are 2 websites that I need to be able to access for work.
https://zabbix.essensys.tech/

https://zabbix.essensys.tech/

I was able to get to both of these without problem from my old ISP (Sky), and I can do the same when I use my mobile hotspot.

But when I try to get to these from Vodafone, it can't find the server.
When I do an NSLookup I get the following:

C:\Users>nslookup netbox.essensys.tech
Server:  UnKnown
Address:  fe80::d635:1dff:fe21:a6b5

*** No internal type for both IPv4 and IPv6 Addresses (A+AAAA) records available for netbox.essensys.tech

I've tried hard setting my DNS to 8.8.8.8, but it doesn't make a difference.
It doesn't seem to be a filter at router level, because I turned off all filtering on my router, and it also didn't help.

[Jayach]

@KeithAlger

I thought similarly, but how does it work when they use a hotspot from their phone?

@pragmaticwaffel

Have you tried reinstalling your VPN software?

This is what I get using PIA instead of Nord

C:\Users\>nslookup essensys.tech
Server: 92521008769a
Address: 10.0.0.243

Non-authoritative answer:
Name: essensys.tech
Address: 35.246.38.241

C:\Users\>nslookup netbox.essensys.tech
Server: 92521008769a
Address: 10.0.0.243

Non-authoritative answer:
Name: netbox.essensys.tech
Addresses: 192.168.252.46
192.168.253.41
192.168.251.71

C:\Users\>ping netbox.essensys.tech

Pinging netbox.essensys.tech [192.168.253.41] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 192.168.253.41:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),

[Anonymous]

Nope they're all local addresses, it might work from a phone if you are on-site and connected to their WiFi, or if you VPN into the worksite.

So any IPv6 address that starts fe80:: is local

Any IPv4 in the range 10.0.0.0 - 10.255.255.255 is local

https://en.wikipedia.org/wiki/Private_network

[Jayach]

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@Anonymous wrote:

Nope they're all local addresses, it might work from a phone if you are on-site and connected to their WiFi, or if you VPN into the worksite.

So any IPv6 address that starts fe80:: is local

Any IPv4 in the range 10.0.0.0 - 10.255.255.255 is local

https://en.wikipedia.org/wiki/Private_network

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Thanks I recognise IPv4 private address's but not IPv6 (yet),

The OP says he is using a VPN, which is why I suggested reinstalling it.

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@pragmaticwaffel wrote:

In terms of the isitdown link, I'm not sureprised it returned a fail, the sites should only be accessible via my VPN with LDAP creds.

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[Anonymous]

It could well be down to the lack of native IPv6 on the Vodafone router and how the "teredo" tunnelling is implemented.  It might be necessary to manually set up the IPv6 settings on the machine being used even with the tunnel.  I guess the problem is that it could be any one of a number of things and is probably nearly impossible to diagnose remotely.