I'm new to Windows Server 2008 and I need assistance with securing the server from attacks of failed login attempts. For several hours at a time, someone is trying to login to the server using winlogin.exe with various names and passwords. They all fail. Below is a copy of a line from the event viewer:
SECURITY LOG: Audit Failure
An account failed to log on.
Security ID: SYSTEM
Account Name: DEDICATED-SERVER$
Account Domain: WORKGROUP
Logon ID: 0x3e7
Logon Type: 10
Account For Which Logon Failed:
Security ID: NULL SID
Account Name: administrator
Account Domain: DEDICATED-SERVER
Failure Reason: Unknown user name or bad password.
Sub Status: 0xc000006a
Caller Process ID: 0xfa8
Caller Process Name: C:\Windows\System32\winlogon.exe
Workstation Name: DEDICATED-SERVER
Source Network Address: 188.8.131.52
Source Port: 3561
Detailed Authentication Information:
Logon Process: User32
Authentication Package: Negotiate
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.
Plus in the System log I receive the following over and over again:
SYSTEM LOG: Event 1012, TerminalServices-RemoteConnectionManager
Remote session from client name a exceeded the maximum allowed failed logon attempts. The session was forcibly terminated.
I need to connect to this dedicated server via Remote Desktop Connection to maintain my websites, etc. So turning off RDP is not an option. The server holds .asp pages for a served CRM application that accesses SQL Server.
I have paid for a hardware firewall setup. I notice that during the time periods when someone is trying to login to the server that my pages are not as fast and it's interferring with the speed of the system.
Any suggestions are appreciated.