Exchange 2010 suddenly stopped delivering mail. System is still online.

Exchange 2010 was working fine til yesterday when it became unresponsive as I was connecting client stations, after a reboot everything went back to working normally, yet now I can neither send nor receive.  I do not get an error message, but I do not receive any of the mail.

I have checked its ports through online utilities and they reply that ports SMTP-25, HTTP-80, and HTTPS-443 are all open.  

Yesterday I noticed that Outlook would throw an error message regarding an object not found upon hitting the Send/Receive button.  Yet, upon further investigation it seemed that the msg was referring to the OAB, which I have not edited since install a few weeks ago.

Error Message:  Task 'Microsoft Exchange Server' reported error (0x8004010F) : 'The operation failed.  An object could not be found.'

Thanks for your help.
ColdbastionAsked:
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pcchiuConnect With a Mentor Commented:
Look like it's the barracuda was holding the mail(for both incoming/outgoing) and you're correct if the mail server is holding up from the email server there's log from the event log and also it will be NDR from the mail server as well.

FYI.
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pcchiuCommented:
Make sure all the necessary exchange service got started up.  Some exchange services may not started after reboot.


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ColdbastionAuthor Commented:
Which services are you referring to?
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ColdbastionAuthor Commented:
The only MS Exchange services that are not running are POP3, IMAP4, Exchange Monitoring, and the extension for Win Backup.  Other than that all other MS Exchange services are running.
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pcchiuCommented:
Make sure check the Administrator tools->services
All Microsoft Exchange ****  with Start up Type(Automatic) need to Started, once a while some service may not started after reboot.

Also for the object not found issue may related to the address book:
http://support.microsoft.com/kb/905813

You may also want to remove the address list and recreate it(make sure you back up the server before you make any changes).

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ColdbastionAuthor Commented:
Call me a moron, but I'm unable to follow that link.  It references 2003, 2007, 2010 exchange, yet it only gives directions for 03 and 07....

Do i need to enable POP3 and IMAP4?
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pcchiuCommented:
no need to enable pop3 or IMAP4 if the user not using pop3 or imap4 to check their email...

From the Exchange management console(2010) for the address book check up.
Organization Configuration->mailbox->Offline Address Book->Right click on the default offline address list->properties


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ColdbastionAuthor Commented:
done.

it has only the Global Address book listed.  Do I need to add another?

it worked fine just like this for 2 weeks.

Or does that mean that the Global Address Book is corrupted or has incomplete entries?
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pcchiuCommented:
Try to uncheck the global address book and see if the problem go away... if it does it mean something wrong with the GAB and you can try to create a new one and see if it fix the issue.

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ColdbastionAuthor Commented:
It forced me to have some entry, so i just created a new entry of just Users, then unselected Global.

Testing now...
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ColdbastionAuthor Commented:
same thing...
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pcchiuCommented:
when there's any changes you may need to restart the Microsoft Exchange Transport service so it applies.

So did the exchange server receive any email at all?

Actually the error message look like is not related to the email flow...  So you may have two issues here?

1.  Error message?
2.  Exchange server not send or receive email?

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ColdbastionAuthor Commented:
I could agree with that assessment that there are two errors.

The error msg started yesterday, mail flow was fine during that time.  I also encountered a forum where an MVP stated that that error will not impede mail flow.

Yet this morning for some reason there simply is no mail flow.  There is also no error that I have yet found as to why mail flow has halted.  

Although, I do not know if this of any worth, but when I scan the server at mxtoolbox.com, it warns that my reverse DNS does not match the SMTP banner.

Could that be an arrow pointing the way?
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pcchiuCommented:
ok the mailflow is more critical so we start from there, worry about the object error later.

1.  The reverse dns does not match doesn't matter for this case(it only matter when deal with spam filtering).

Here's couple question:
1.  Did you verify and make sure all the exchange services is up and running?
2.  Is the mx record for your domain point to the right server?
3.  Do you have any anti-spam filter/software?

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ColdbastionAuthor Commented:
1) Yes, with the exception of the four services I named. all were running and set to auto.
2) MX record is pointed unless someone else has messed with it.  I haven't touched it since initial install.
3) No spam/filtering software, I do have a barracuda box.

Now, here is the ODDD thing.  Mail just started flowing

I haven't done anything to the server other than what we were discussing, and most of it, I undid when it didn't prove successful.  I can send and receive mail and it seems that the server held all of the mail and delivered it right now.

Another odd point, when there was no mail flow, it would not give me a msg undeliverable response.

What could cause such behavior?
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pcchiuCommented:
I think that may related to your barracuda box.
I assume here's your setup:

From outside->
Email hit barracuda then exchange server

From inside->
Email hit the exchange server then it go to barracuda

So all email need to go thru the barracuda box?



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ColdbastionAuthor Commented:
Yes, everything goes through the barracuda box.  So you think the barracuda was holding the mail?  Am I incorrect in the assumption that a down mail server should result in message undeliverable responses?
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