A cloud administrator has finished setting up an application that will use RDP to connect. During testing, users experience a connection timeout error.
Which of the following will MOST likely solve the issue?
A . Checking user passwords
B. Configuring QoS rules
C. Enforcing TLS authentication
D. Opening TCP port 3389
Answer: D
Explanation:
Reference: https://docs.microsoft.com/en-us/windows-server/remote/remote-desktop-services/troubleshoot/rdp-error-general-troubleshooting
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