Unable to rejoin Azure classic manchines to domain and cant RDP using local admin account

Question

Hello,

We have disjoined two Azure classic servers from the domain, and now we are unable to re-join the domain. We are also unable to connect via RDP using a local admin account.

The boot diagnostics screen shows us a login prompt.
Servers respond to ping requests, but RDP does not provide a login prompt.

Is there a way to connect to a console in classic without using RDP so that we can troubleshoot the issues further?
Many thanks,

Answer 1

Classic VMs do not support the serial console. Can you RDP privately from another virtual machine?

If not, here are some troubleshooting tips.

https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/reset-rdp

My guess is that you have a Windows Firewall rule that allowed RDP access from domain joined sources only so the link below may help you. You could use the Run command to make changes to the Windows firewall configuration

https://learn.microsoft.com/en-us/troubleshoot/azure/virtual-machines/guest-os-firewall-blocking-inbound-traffic

Answer 2

Hello @Emilio De Marco ,
Thanks for posting your query on Microsoft QnA.
As Alan has already mentioned above, classic VMs do not support Serial console feature.
However, to build on top of what Alan has suggested, I think this might be a network level authentication issue, as you are not even getting the RDP prompt?
I would also recommend you to telnet to you VM remotely to RDP port and check if the telnet connection is a success.
Please let me know how the above tests go by dropping a comment below and I can help further. Thanks :)
Looking to hear back from you.

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