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

Posted on 2006-03-22
Last Modified: 2012-06-27
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


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:, 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?

Question by:Encams

    Author Comment

    I'm still getting these errors - about 20 a day!

    Can no-one point me in any direction to fix it?!

    Expert Comment

    I get them all the time, too, on several SBS2003 SP1 Servers.  Wondering if it's related to Exchange ActiveSync authentication?

    Author Comment

    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.

    Expert Comment

    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....
    LVL 9

    Expert Comment

    I have no problem with keepink the Q open for a while, as long as you are willing to work on it ;o)

    EE Cleanup Volunteer

    Author Comment

    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.

    LVL 1

    Accepted Solution

    PAQed with points refunded (500)

    Community Support Moderator

    Expert Comment

    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.

    Expert Comment

    Create a new reg key:


    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"

    Featured Post

    IT, Stop Being Called Into Every Meeting

    Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

    Join & Write a Comment

    Suggested Solutions

    Preface Having the need * to contact many different companies with different infrastructures * do remote maintenance in their network required us to implement a more flexible routing solution. As RAS, PPTP, L2TP and VPN Client connections are no…
    Setting up a Microsoft WSUS update system is free relatively speaking if you have hard disk space and processor capacity.   However, WSUS can be a blessing and a curse. For example, there is nothing worse than approving updates and they just have…
    In this sixth video of the Xpdf series, we discuss and demonstrate the PDFtoPNG utility, which converts a multi-page PDF file to separate color, grayscale, or monochrome PNG files, creating one PNG file for each page in the PDF. It does this via a c…
    Here's a very brief overview of the methods PRTG Network Monitor ( offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

    754 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    21 Experts available now in Live!

    Get 1:1 Help Now