How come that on one particular machine in our network, MS Exchange SMTP doesn't provide any authentication mechanisms?
On my machine it goes:
CLIENT > EHLO [10.51.5.31] SERVER > 250-mail.MYSERVER.com Hello [10.51.5.31] 250-SIZE 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-STARTTLS 250-AUTH NTLM 250-8BITMIME 250-BINARYMIME 250 CHUNKING
Where on that particular machine it goes:
CLIENT > EHLO [10.1.240.209] SERVER > 250-mail.MYSERVER.com Hello [10.1.240.209] 250-SIZE 10485760 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-STARTTLS 250-AUTH 250-8BITMIME 250-BINARYMIME 250-CHUNKING 250 XEXCH50
As you can see, my machine gets 'AUTH NTLM' as an answer whereas the other machine only gets 'AUTH' with no authentication mechanisms, causing the SMTP client to bail out with a "No compatible authentication mechanisms found." message.
What might be causing this difference in answers from the same server and more importantly, how do we fix it?