sometimes email stops working

Hey guys,

Running a SBS08 box and it seems that at periodic times maybe once a month or once every other month email stops working for some odd reason. The fix is just to reboot the whole server and it comes right back up but I really am trying to figure out what its happening and if I can prevent that from happening. Any suggestions or has anyone experienced this before??
sbodnarAsked:
Who is Participating?
 
losipConnect With a Mentor Commented:
Sorry - OAB is Offline Address Book - part of Exchange.

I did a quick Google and there are quite a lot of posts about this or similar problems with SBS2008.  The most promising seemed to be http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/SBS_Small_Business_Server/Q_24298596.html

What do think about trying that patch: http://blogs.technet.com/sbs/archive/2009/02/12/you-may-lose-network-connectivity-on-sbs-2008-when-using-a-driver-which-utilizes-tdi.aspx ?
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losipCommented:
Are there any errors or relevant events recorded in the event log at the time this happens?  If so, please post the details.
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sbodnarAuthor Commented:
THis was the firs trigger;

Log Name:      Application
Source:        MSExchangeFDS
Date:          10/27/2010 9:09:33 PM
Event ID:      1003
Task Category: General
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      Nxxx.xxx.local
Description:
Process MSExchangeFDS.exe (PID=6840). Temporarily unable to connect to Active Directory to read configuration data for object OAB (60). Will wait for %5 seconds and retry.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MSExchangeFDS" />
    <EventID Qualifiers="32772">1003</EventID>
    <Level>3</Level>
    <Task>1</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2010-10-28T01:09:33.000Z" />
    <EventRecordID>533042</EventRecordID>
    <Channel>Application</Channel>
    <Computer>xxx1.xxx.local</Computer>
    <Security />
  </System>
  <EventData>
    <Data>MSExchangeFDS.exe</Data>
    <Data>6840</Data>
    <Data>OAB</Data>
    <Data>60</Data>
  </EventData>
</Event>

than this followed 20 minutes later leading to multiples warnings for the next couple of hours until i rebotted

Log Name:      Application
Source:        MSExchange ADAccess
Date:          10/27/2010 9:23:54 PM
Event ID:      2121
Task Category: Topology
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      xxx.xxx.local
Description:
Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=2736). Exchange Active Directory Provider found SRV records for domain controllers in domain htu.local.
 The query was for the SRV record for _ldap._tcp.dc._msdcs.htu.local
 The following domain controllers were identified by the query:
njsrv01.htu.local

 Common causes of this error include:
 - Host (A) records fore each server are missing  in DNS or contain incorrect IP addresses.
 - Domain controllers registered in DNS are not connected to the network or are not running.
 For information about correcting this problem,  type in the command line:
hh tcpip.chm::/sag_DNS_tro_dcLocator_messageHa.htm
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MSExchange ADAccess" />
    <EventID Qualifiers="32772">2121</EventID>
    <Level>3</Level>
    <Task>3</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2010-10-28T01:23:54.000Z" />
    <EventRecordID>533078</EventRecordID>
    <Channel>Application</Channel>
    <Computer>xxx.xxx.local</Computer>
    <Security />
  </System>
  <EventData>
    <Data>MSEXCHANGEADTOPOLOGYSERVICE.EXE</Data>
    <Data>2736</Data>
    <Data>xxx.local</Data>
    <Data>_ldap._tcp.dc._msdcs.htu.local</Data>
    <Data>x.xxx.local
</Data>
    <Data> type in the command line:
hh </Data>
    <Data>tcpip.chm::/sag_DNS_tro_dcLocator_messageHa.htm</Data>
  </EventData>
</Event>

Ideas?
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losipCommented:
Looks like it might be trying to get the OAB from another computer.  Have you ever had another DC or Exchange server in htu.local as well as this SBS box?  I fancy something may not have been cleaned out properly if you have.
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sbodnarAuthor Commented:
No, this was a brand new domain that was built up.

What is an OAB?
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sbodnarAuthor Commented:
Hmmm...very good find!

I have one more question and I apologize if its sounds dumb in the statement I am pasting below, what does TDI mean? How do i know if Im using it?

I"f you are encountering any sort of connectivity issue that is only fixed through a reboot, and are running a program that uses TDI please install this hotfix"
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losipCommented:
TDI is a Transport Driver interface - a driver installed by some older firewalls - have you added any such software to SBS?  TDI is being phased out and replaced by Windows Filtering Platform but MS have a patch for you if it is the TDI driver causing the problem.  That patch is at: http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=961775&kbln=en-us and you should use the Vista version on SBS2008.

There is a guide to TDI at: http://www.komodia.com/index.php?page=tdi.html but it doesn't tell you what products use it.  Have you added any significant anti-virus, firewall or other products to SBS?
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sbodnarAuthor Commented:
It may be a result of the Trend Micro Worry Free Suite that is running on the server... that has a firewall agent as part of the suite

What do you think?
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losipCommented:
Yes, I think it's worth trying with Trend disabled- if only for diagnostic purposrs
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sbodnarAuthor Commented:
why would I need to disable Trend?
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sbodnarAuthor Commented:
I installed the hotfix last night and will update you in a week or so if the update worked.
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sbodnarAuthor Commented:
Its been over a month now and no issues (finger crossed).
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