Strange connectivity problem; how to debug?

[mc5686]

Hi,
I have a ZeroTier Central managed network I use essentially to access some servers (behind a firewall) from outside.

In particular I have a Host machine (Debian Linux) hosting a few VirtualBox Virtual Machines.
I have ZeroTier installed on Host and on one of the VMs.
I can access both from home on the same ZT net.
So far, so good.
Today I noticed the two machines (Host and VM) seem unable to communicate with each other.
This is not really important because I have other means to have them communicate, but I’m surprised and curious.
How can I debug this situation?
Is it a symptom of some misconfiguration?

Thanks in Advance
Mauro

[remys]

Did you verify the node-id of your machines. I had the same issue after cloning one machine from another. They ended up having the same id.
try zerotier-cli status

[Michael]

Just by chance I would like to ask, since I will maybe also clone a machine with zerotier the next weeks: what are the needed steps to do after cloning to get a new id?

[mc5686]

@remys

zerotier-cli status

VM:
root@ns1:~# zerotier-cli status
200 info e1c115eb11 1.4.6 ONLINE
root@ns1:~# zerotier-cli listnetworks
200 listnetworks
200 listnetworks 565799d8f676ff01 OKCASH 02:1e:b7:e3:33:88 OK PRIVATE ztr2q66j7x 172.24.46.90/16

Host:
root@vmhost:~# zerotier-cli status
200 info 0794e815fe 1.4.6 ONLINE
root@vmhost:~# zerotier-cli listnetworks
200 listnetworks
200 listnetworks 565799d8f676ff01 OKCASH 02:f8:e2:1e:cd:67 OK PRIVATE zt1 172.24.212.186/16

Notice These are not two, possibly cloned VMs, but one VM and the Host running it.

[remys]

https://zerotier.atlassian.net/wiki/spaces/SD/pages/327693/How+to+Clear+Reset+your+ZeroTier+Address