Event Viewer problem: Event ID: 5050 IAS - Local computer does not have the necassary DLL files to display message

On my exchange server i've had this recent event log entry come up in my Application event viewer:

Event Type:      Information
Event Source:      IAS
Event Category:      None
Event ID:      5050
Date:            22/03/2006
Time:            15:31:31
User:            N/A
Computer:      EXCHANGE

Description:

The description for Event ID ( 5050 ) in Source ( IAS ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: EXCHANGE.DOMAIN.co.uk, DOMAIN.

And this entry appears every 30mins or so.

I have tried to open the log on a couple of other computers using the AUXSOURCE flag, but i still get the same message and nothing different.

Any idea what is causing this message and how i would go about correcting it?

Thanks
EncamsAsked:
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EncamsAuthor Commented:
I'm still getting these errors - about 20 a day!

Can no-one point me in any direction to fix it?!
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mtn_lionCommented:
I get them all the time, too, on several SBS2003 SP1 Servers.  Wondering if it's related to Exchange ActiveSync authentication?
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EncamsAuthor Commented:
No idea,

I've got 4 Win2003SP1 servers in the domain and only the Exchange server is producing this error.
It happenend after i finished all the outstanding Windows 2003 patches and fixes.
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mtn_lionCommented:
vsg375: No points involved yet, and I don't want any, but I would ask you to keep the question open for a while longer, please.

Encams: I found just a couple of posts on other forums about this--as you probably have--but no answers.  One person says the message logs on a 2003sp1 server every time an RDP connection to it is attempted and hangs (then second attempt succeeds; stranger still).  Another person thought it might be related to having previously had a 2003sp1 server configured as a RADIUS server, but he never did get to the bottom of it.  As another user in that thread finally suggested, it must just be a bug (and a low priority for Microsoft), and it doesn't actually seem to reflect a problem (it is, after all, an "information" event).

So, I'm going to move on with life....
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vsg375Commented:
I have no problem with keepink the Q open for a while, as long as you are willing to work on it ;o)

Cheers
vsg375
EE Cleanup Volunteer
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EncamsAuthor Commented:
It is a bit rubbish isn't it.

The server is just and Exchange server and has never used Radius, i've read a lot of posts elsewhere with similar people reporting the same problem, but no solutions (so far!) What really annoys me is the fact Microsoft haven't documented this error in anyway.

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DarthModCommented:
PAQed with points refunded (500)

DarthMod
Community Support Moderator
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lucky1028Commented:
The best I could figure out was that there are some messaging dll's missing and adding them might fis the issue. I am not sure what they are though and a reinstall over the old version might add them.
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llhuffCommented:
Create a new reg key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\EventLog\Application\IAS

Then add these values:

EventMessageFile (string Value) = %SystemRoot%\System32\iassvcs.dll;%SystemRoot%\System32\mprmsg.dll;%SystemRoot%\System32\ws03res.dll

ParameterMessageFile (string Value) = %SystemRoot%\System32\iassvcs.dll

TypesSupported (REG_DWORD) = 31(decimal)

As soon as I did this the Event Log was able to read the event - "A LDAP connection with domain controller was established"
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Windows Server 2003

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