Which of the following will MOST likely solve the issue?

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

View Answer

Answer: D

Explanation:

TCP port 3389 is the default port used by Remote Desktop Protocol (RDP) to connect to a remote system or application over a network. Opening TCP port 3389 on the firewall or network device will most likely solve the issue of users experiencing a connection timeout error when trying to use RDP to connect to an application, as it will allow RDP traffic to pass through. If TCP port 3389 is closed or blocked, RDP traffic will be denied or dropped, resulting in a connection timeout error.

Reference: CompTIA Cloud+ Certification Exam Objectives, page 15, section 2.8

Reference: https://docs.microsoft.com/en-us/windows-server/remote/remote-desktop-services/troubleshoot/rdp-error-general-troubleshooting