| Hi,
I have written a
client and server that uses NTLM Challenge/Response to authenticate. We use the
Microsoft SSPI NTLM provider to provide the authentication and all works fine.
We use AcquireCredentialsHandle, InitializeSecurityContext,
etc..
We are now
implementing NTLM authentication over SMTP in our SMTP client but when we try
and authenticate to the Microsoft Virtual SMTP Server (from a remote machine)
the authentication fails. Strangely it works when both the SMTP server and the
program are on the same machine.
The Event Log on the
server shows an unusual Logon Failure entry with
Logon
Failure:
Reason: An unexpected error occurred during
logon
User
Name:
Domain:
Logon
Type: 3
Logon
Process: ;(ú^
Authentication Package:
NTLM
Workstation
Name:
And the SMTP
conversation is ...
AUTH
NTLM
334 NTLM
supported
TlRMTVNTUAABAAAAB7IIogkACQAtAAAABQAFACgAAAAFASgKAAAAD0tQREVWQ09ERVNUT05F
334
TlRMTVNTUAACAAAAEgASADAAAAAFgomgehZluoip9o8AAAAAAAAAAHwAfABCAAAAQwBPAEQARQBTAFQATwBOAEUAAgASAEMATwBEAEUAUwBUAE8ATgBFAAEAEABUAEUAUwBUAEUAWABDAEgABAAaAGMAbwBkAGUAcwB0AG8AbgBlAC4AbgBlAHQAAwAsAHQAZQBzAHQAZQB4AGMAaAAuAGMAbwBkAGUAcwB0AG8AbgBlAC4AbgBlAHQAAAAAAA==
TlRMTVNTUAADAAAAGAAYAHwAAAAYABgAlAAAABIAEgBIAAAAGAAYAFoAAAAKAAoAcgAAAAAAAACs
AAAABYKIogUBKAoAAAAPQwBPAEQARQBTAFQATwBOAEUASwBlAHYAaQBuACAAUABhAGwAbQBlAHIA
SwBQAEQARQBWANUywn1Vkz3kAAAAAAAAAAAAAAAAAAAAAMwtmh/j9XPX0Kjy+mG0Foj8K8Jx+27W
iw==
535 5.7.3
Authentication unsuccessfull
I've compared the
packets with Outlook Express's which works fine and they seem very
similar.
Has anyone
experienced this problem before? Am i missing something?
I can send the code,
packet dumps ;or any other information to assist...
Cheers
Kevin. |
