RDP is not allowing you to log into a Windows Server. What should you do?
Possible Solutions (that can be followed in random order)
- Is port 3389 blocked? Are you using iptables or a public cloud? Check egress ports from the client and ingress ports on the Windows server. You can use PowerShell or nmap to test port 3389.
- Are Remote Desktop Services running on the server?
- Can you make sure the Domain Controller is working correctly with the Windows server?
- Do you get a vague "internal error" when it fails. You may have misconfigured Network Level Authentication (NLA). Can you temporarily disable NLA on the Windows server? See this Microsoft article for further information.
- Can you use PowerShell or some other method to log in? Maybe your credentials are not working at all.
- Does the RDP client work with other Windows machines? If not, can you use a new RDP client? There are different clients for Windows and Linux.
- See this Microsoft article on troubleshooting RDP.