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 I have a Windows 2008 server (domain joined). As you can see in the events listed below, unknown user account 'beuser' has successfully logged in to Terminal server from IP address Network Address: using Port#      50227 with Workstation Name "ШУРА-ПК".
 Clearly this user name BEUSER does not exist in Active Directory. When I run IP Trace, It says: Continent:      Europe (EU) Country:      Latvia and we don't have any computer user living outside US.

 How is it possible for anyone to log in wit this user account?
 Is the port# 50227 is designed to accept BEUSER?

 I have Linksys Router that does NAT and port forwarding and I run Backup Exec software on the Domain Controller.

 Can you help?

An account was successfully logged on.

      Security ID:            NULL SID
      Account Name:            -
      Account Domain:            -
      Logon ID:            0x0

Logon Type:                  3

New Logon:
      Security ID:            Domain_Name\BEUser
      Account Name:            BEUser
      Account Domain:            NHECO
      Logon ID:            0x147e7e
      Logon GUID:            {00000000-0000-0000-0000-000000000000}

Process Information:
      Process ID:            0x0
      Process Name:            -

Network Information:
      Workstation Name:      ШУРА-ПК
      Source Network Address:      -
      Source Port:            -

Detailed Authentication Information:
      Logon Process:            NtLmSsp
      Authentication Package:      NTLM
      Transited Services:      -
      Package Name (NTLM only):      NTLM V2
      Key Length:            128
Network Information:
      Network Address:
      Port:                  50227
NetworkingActive DirectoryNetwork SecurityWindows Server 2008

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8/22/2022 - Mon