為什麼我的憑證因遠程桌面而失敗，以及如何修復它？

錯誤的用戶名或密碼可能導致遠程桌面連接失敗，應確認輸入正確並在必要時重置密碼；2. 檢查遠程桌面的身份驗證設置，如網絡級別身份驗證（NLA）是否配置正確；3. 確保用戶賬戶具有遠程訪問權限並屬於正確的用戶組；4. 更新憑證管理器中過時的保存憑據以避免使用舊信息；5. 排查防火牆或網絡問題，確保端口3389開放且網絡策略允許RDP流量。這些問題涵蓋了從基本憑據到高級網絡配置的常見故障點，逐步排查可有效解決大多數遠程連接失敗的問題。

Your credentials might fail for Remote Desktop because of incorrect username or password, authentication settings, network issues, or permission problems. Let's break down the common causes and how to actually fix them.

1. Wrong Username or Password

This is the most straightforward but often overlooked issue. You might think you're typing it right, but small mistakes like Caps Lock being on or an extra space can cause this.

• Make sure you're entering the correct username and password.
• If you're connecting to another domain or local machine, include the domain name in front: DOMAIN\username or use the local machine name like .\username .
• Try resetting the password if you're unsure — especially if you haven't used it in a while.

If you're using saved credentials (like through Windows Credential Manager), double-check those too. Sometimes they get outdated without you realizing.

2. Remote Desktop Authentication Settings

Windows has different levels of security settings that control how RDP authenticates users.

Here are some things to check:

• Ensure Network Level Authentication (NLA) is configured correctly. Some older systems or misconfigured setups may not support it, causing login failures.
• On the remote machine:
  • Go to System Properties > Remote
  • Under the Remote Desktop section, make sure “Allow remote connections to this computer” is enabled
  • Check whether “Allow connections only from computers running Remote Desktop with Network Level Authentication” is selected — if so, and your client doesn't support NLA, you'll get a credentials error

Try disabling NLA temporarily to see if that resolves the issue.

3. User Account Doesn't Have Remote Access Permissions

Not all user accounts are automatically allowed to connect via Remote Desktop.

To verify:

• On the remote PC, go to Control Panel > System > Remote Settings
• Click Select Users under Remote Desktop
• Make sure the user account you're trying to log in with is listed there

If not, add it. Also, ensure the account is part of the Remote Desktop Users group, or has administrative privileges.

Sometimes even if the account is added, group policy or domain policies might block access — especially in business environments. In such cases, contact your system admin.

4. Credential Manager or Saved Credentials Are Outdated

If you've connected before and saved the password, Windows might be using old or wrong credentials automatically.

You can manage this by:

• Opening Credential Manager in Windows
• Look under Windows Credentials
• Find any entries related to the remote computer and either edit or remove them
• Try reconnecting and enter the credentials again manually

This forces RDP to ask for fresh input instead of pulling from a stored, possibly incorrect version.

5. Firewall or Network Issues Blocking Authentication

While firewall issues usually prevent connection entirely, sometimes they interfere with the authentication process mid-way.

• Make sure port 3389 is open on the remote machine
• Temporarily disable the firewall on both ends to test if it's interfering
• If connecting over the internet, ensure NAT/port forwarding is set up properly on the remote side

Also, if you're on a corporate network, certain proxies or network policies might block or modify RDP traffic.

Basically, start with the simple stuff — username, password, permissions — and then move to more technical areas like authentication settings and network rules. Most of these fixes don't require advanced tools, just a few careful checks.

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