troubleshooting Question

Exchange 2003 Intruder trying to logon

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Djrobluv asked on
Exchange
10 Comments1 Solution219 ViewsLast Modified:
I just noticed a situation on our Exchange Server in the Security Event Viewer. Looks as though someone is trying to log on to our Exchange Server. The only port open to this server is port 25 from the outside. So far the intruder has been unable to logon. How should I go about trying to find out how they are trying to login any help in pointing me in the right direction will help. Here is what was found in the Event Log:
Logon Failure:
       Reason:            Unknown user name or bad password
       User Name:      SERVER$
       Domain:            IPCRI
       Logon Type:      3
       Logon Process:      NtLmSsp
       Authentication Package:      NTLM
       Workstation Name:      SERVER
       Caller User Name:      -
       Caller Domain:      -
       Caller Logon ID:      -
       Caller Process ID:      -
       Transited Services:      -
       Source Network Address:      -
       Source Port:      -
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