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From: "Brandy Nee [MSFT]" on 8 Jun 2005 06:14
Hello Stuart,

Thank you for posting back.

From the event log, it seems that the remote host 195.102.148.25 is sending
the xexch50 SMTP command to this SBS server without being authenticated
first. So this is the sending server's issue and it does nothing to do with
your Exchange server.

In a normal SMTP transactions, xexch50 is not used, so we can safely ignore
this event. You can also disable the xexch50 authentication by changing the
registry key, to do so, please see:

a) On the server, run "regedit" (without quotation marks).

b) Expand to
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\SMTPSVC\XEXCH50\Exch50A
uthCheckEnabled value.

c) Set the data value to 0.

Hope this information helps. If anything unclear, please let me know. I am
glad to be of assistance.

Best regards,

Brandy Nee

Microsoft CSS Online Newsgroup Support

Get Secure! - www.microsoft.com/security

=====================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
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From: Stuart on 8 Jun 2005 07:14
Thank Brandy

Before I make a change in the registry, can I check what you mean. I have no
Exch50AuthCheckEnabled value - is this a DWORD like SuppressExternal that I
set previously?

Stuart

""Brandy Nee [MSFT]"" wrote:

> Hello Stuart,
>
> Thank you for posting back.
>
> From the event log, it seems that the remote host 195.102.148.25 is sending
> the xexch50 SMTP command to this SBS server without being authenticated
> first. So this is the sending server's issue and it does nothing to do with
> your Exchange server.
>
> In a normal SMTP transactions, xexch50 is not used, so we can safely ignore
> this event. You can also disable the xexch50 authentication by changing the
> registry key, to do so, please see:
>
> a) On the server, run "regedit" (without quotation marks).
>
> b) Expand to
> HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\SMTPSVC\XEXCH50\Exch50A
> uthCheckEnabled value.
>
> c) Set the data value to 0.
>
> Hope this information helps. If anything unclear, please let me know. I am
> glad to be of assistance.
>
> Best regards,
>
> Brandy Nee
>
> Microsoft CSS Online Newsgroup Support
>
> Get Secure! - www.microsoft.com/security
>
> =====================================================
> When responding to posts, please "Reply to Group" via your newsreader so
> that others may learn and benefit from your issue.
> =====================================================
>
> This posting is provided "AS IS" with no warranties, and confers no rights.
>
>
From: "Brandy Nee [MSFT]" on 8 Jun 2005 21:56
Hello Stuart,

Thank you for posting back.

Please go to
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\SMTPSVC\XEXCH50, on
the Tool bar, click Edit, New, Select DWORD value. Rename it as
"Exch50AuthCheckEnable". By default, the value data should be 0, in case,
you can double click the value name, put 0 into the Value Data blank.

Hope this information helps. If anything unclear, please let me know. I am
glad be of assistance.

Best regards,

Brandy Nee

Microsoft CSS Online Newsgroup Support

Get Secure! - www.microsoft.com/security

=====================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
=====================================================

This posting is provided "AS IS" with no warranties, and confers no rights.

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