Logon attempt failed Remote Desktop Windows 7

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Hi enwoods01,

First of all, please ensure all the machines [both the server and the Windows 7 clients] are up to date. The latest KB for server 2016 should be KB4010672 and the latest KB for Windows 7 should be KB3212646.

Please try different credentials then check the symptom again.
I have tested on my side. It is available for me to remote to a Server 2016 from a Windows 7 machine. So the issue should be related to the specific environment.
Please check the Event Viewer for more information to troubleshoot this issue.
Event Viewer[Windows Logs\Applications, System, Applications and Services\Microsoft\Windows\Remote Desktop Services ].

Considering the issue is related to the Server 2016, we could try to ask for help from our Server forum at the same time.
Windows Server 2016 General
//social.technet.microsoft.com/Forums/en-US/home?forum=ws2016

Best regards

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edwoods01

We had the same issue. It was due to the GPO on the Server 2016: Computer Configuration\Policies\Windows Settings\Security Settings\Local Policies\Security Options\Network security: LAN Manager authentication level being set to "Send NTLMv2 response only. Refuse LM & NTLM". It was fixed by changing this to "Send NTLMv2 response only." If you don't have the latest Windows patches installed you may need a lower setting like "Send LM & NTLM - user NTLMv2 session security if negotiated."

Best,

Mark