Common reasons for not being able to connect to remote desktops include network problems, permissions settings errors, and firewall blocking. First, check whether the local and remote computers are on the same network or public network IP is correct, and use the ping command to test network connectivity; second, make sure that the remote computer has enabled the "Allow Remote Connection" function and added users who allow connections; then check whether the firewall has released TCP 3389 ports, including Windows firewall and third-party security software; finally handle the authentication problem, confirm that the user name and password are correct, and enable network-level authentication. Note that Windows Home Edition does not support the remote desktop function, and requires patching or using other tools. Follow the above steps to troubleshoot, most remote desktop connection problems can be solved.

The remote desktop cannot be connected, which is a problem that many users will encounter when using Windows. It may be a network problem, a wrong permission setting, or it may be a firewall blocking the connection. The following common reasons and corresponding solutions can help you quickly troubleshoot and fix problems.

Check if the network connection is normal

First, you need to confirm whether both local and remote computers can access the Internet normally and communicate with each other.

• If it is a LAN connection, make sure that the two devices are on the same network.
• If it is a cross-network connection (such as from the home company), confirm that the remote computer has a public network IP or has port mapping.
• You can try to use the ping 遠(yuǎn)程IP command to test whether the network is open. If it doesn't work, it means there is a problem with the network or firewall.

Sometimes restrictions are made by the router or corporate network, which may also cause the remote desktop connection to fail. You can test it in another network environment.

Make sure the remote desktop feature is enabled

The remote computer must enable the "Allow Remote Connection" function, otherwise it will definitely not be connected.

1. Open "System Properties" on the remote computer (you can select "Properties" by right-clicking "This Computer").
2. Click "Remote Settings" on the left.
3. In the Remote tab, check "Allow remote connection to this computer".

In addition, be careful whether the user account that allows connection is selected. If no user is added, some system versions will refuse connections by default.

Check firewall and port settings

The default remote desktop uses TCP 3389 port. If this port is blocked by a firewall, the connection will fail.

• On a remote computer, open Control Panel -> Windows Defender Firewall -> Allow apps to pass through the firewall.
• Check the list for "Remote Desktop" and allows private and/or public networks.

If you are using a third-party firewall or security software, also check whether the remote desktop connection is blocked.

If it is a server or remote computer in the intranet, you must also confirm whether the router or gateway has released port 3389 and correctly mapped to the target computer's IP address.

Handle authentication or credentials issues

Sometimes the prompt "authentication error" or "unable to connect" is actually a problem with credentials or remote desktop services.

• Confirm that the username and password you entered is correct, especially when the remote computer is in a domain environment.
• You can try to enable the "Allow Remote Desktop User Login with Network-level Authentication" option on a remote computer.
• If you prompt "No Remote Desktop Authorization Server", you may need to install the Remote Desktop Service Authorization Role, or you are using a non-server system.

If it is a Windows Home Edition system, please note that it does not support the remote desktop function itself, and additional patches are required or other tools are used.

Basically, these common problems and solutions. Although there are many reasons for the failure of remote desktop connection, most of them can be solved by checking them in terms of network, settings, firewall, and permissions.

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