这是我们安装了所有更新的Windows 2008 R2服务器。我只限制对自己IP的RDP访问（Windows防火墙规则）。当我尝试从任何其他IP RDP时，甚至没有获得用户名/通过屏幕（意味着规则已正确设置）。此外，只有RDP和http和https端口打开。但是我在安全日志中看到许多这样的登录尝试：
An account failed to log on.
Subject:
Security ID: NULL SID
Account Name: -
Account Domain: -
Logon ID: 0x0
Logon Type: 3
Account For Which Logon Failed:
Security ID: NULL SID
Account Name: Administrator
Account Domain: CLUSTER02
Failure Information:
Failure Reason: Unknown user name or bad password.
Status: 0xc000006d
Sub Status: 0xc000006a
Process Information:
Caller Process ID: 0x0
Caller Process Name: -
Network Information:
Workstation Name: CLUSTER02
Source Network Address: 113.177.2.43
Source Port: 2176
Detailed Authentication Information:
Logon Process: NtLmSsp
Authentication Package: NTLM
Transited Services: -
Package Name (NTLM only): -
Key Length: 0
This event is generated when a logon request fails. It is generated on the computer where access was attempted.
The Subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.
The Logon Type field indicates the kind of logon that was requested. The most common types are 2 (interactive) and 3 (network).
The Process Information fields indicate which account and process on the system requested the logon.
The Network Information fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.
The authentication information fields provide detailed information about this specific logon request.
- Transited services indicate which intermediate services have participated in this logon request.
- Package name indicates which sub-protocol was used among the NTLM protocols.
- Key length indicates the length of the generated session key. This will be 0 if no session key was requested.
我该如何阻止这些攻击？ 在此先感谢您的帮助。