220-802 · Question #963
A technician recently installed Windows 7 on a PC. The technician is unable to connect to the PC remotely using RDP, but is able to ping the PC. Which of the following is the MOST likely cause?
The correct answer is C. The router firewall is enabled. Ping uses ICMP while RDP uses TCP port 3389; a firewall can block one protocol while allowing the other, explaining why ping succeeds but RDP fails.
Question
A technician recently installed Windows 7 on a PC. The technician is unable to connect to the PC remotely using RDP, but is able to ping the PC. Which of the following is the MOST likely cause?
Options
- AThe PC is infected with a virus.
- BThe network card is defective.
- CThe router firewall is enabled.
- DThe Remote Assistance is disabled.
How the community answered
(52 responses)- A12% (6)
- B4% (2)
- C81% (42)
- D4% (2)
Why each option
Ping uses ICMP while RDP uses TCP port 3389; a firewall can block one protocol while allowing the other, explaining why ping succeeds but RDP fails.
A virus infection would not typically allow ping to succeed while selectively blocking only RDP without producing other observable symptoms.
If the network card were defective, ICMP ping traffic would also fail since both protocols share the same physical NIC.
The router firewall may be blocking TCP port 3389 (RDP) while still permitting ICMP echo requests, which is a common firewall configuration that allows basic connectivity tests to pass but prevents Remote Desktop sessions from being established.
Remote Assistance is a separate Windows feature from Remote Desktop Protocol and its enabled or disabled state has no effect on RDP connectivity.
Concept tested: Firewall port blocking affecting RDP vs ICMP
Source: https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/clients/remote-desktop-allow-access
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