Why Exchange server always stopped intermittently?

This is using MS Exchange 2010 server on MS Windows 2008 R2 server. This server has been used for couple of years. Recently, users complaints that they can't access OWA for their web mails. I checked and found that the service - MS Exchange form-based authentication was found stopped. OWA operation resumes after restarted the mentioned service. But the problem is, this service looks like always stopped once per 2 week, why? How to stop this problem happens again?

Thanks,
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MichaelBalackAsked:
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
You need to check most of your event logs in your exchange. My doubt would be related to your network driver and negotiation of speed.

Try running ExPBA and see the results. Make sure to do a complete server backup of your exchange ASAP.
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David Paris VicenteSystems and Comunications  Administrator Commented:
I also advise you to update Exchange 2010 to the latest SP3 if you already don´t have it.
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MichaelBalackAuthor Commented:
Hi David,

How to check whether the exchange is installed with sp3 or not?
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David Paris VicenteSystems and Comunications  Administrator Commented:
On EMC you can check the Exchange Version.

EMC-> Server Configuration->Middle Pane.
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MichaelBalackAuthor Commented:
ok, will check...
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
from the exchange management shell execute;

Get-ExchangeServer | select Name, AdminDisplayVersion

or from GUI (exchange management console) click on Server Configuration.

if the  build is 14.2 you are on SP2.

For a complete list versions & build numbers refer the below link;

http://social.technet.microsoft.com/wiki/contents/articles/240.exchange-server-and-update-rollups-build-numbers.aspx
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MichaelBalackAuthor Commented:
version 14.3   (123.4). So, it is service pack 3?
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
yes but with no Update Rollups
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
can you check if the Forms-Based Authentication Service is set to "Automatic (Delayed Start)"? if not set it so.
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David Paris VicenteSystems and Comunications  Administrator Commented:
You can follow the suggestion of Zackur.

But can you tell us if this is a virtual machine or a bare metal?

You also can follow this KB

You should also check communications between your DNS server, GC to the Exchange Server, and verify your NIC card for new drivers/firmware.

Hope it helps.
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MichaelBalackAuthor Commented:
Hi David,

This is physical server. This server is also DC, with DNS/GC co-exist.
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
Michael,

Usually we do this kind of setup in test labs! not in production at all. Now the picture is very clear to us.
Having configured the same server with AD & Exchange, the services are either getting stuck, or not receiving a timely response from the dependencies. Why don't  you separate your exchange? are there any budget constrains or something else?

Any way, the option for you now is to  set the Forms-Based Authentication Service  to "Automatic (Delayed Start)".
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MichaelBalackAuthor Commented:
Hi Zackur,

There is a budget constraint, so both DC and Exchange are on 1 physical server.

I have set exchFBP to be delayed start, and so far 1 week past, looks good.
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Zacharia KurianAdministrator- Data Center & NetworkCommented:
Michael,

Keep watching for a couple of weeks and make sure that the service is stable. Hope you do have a backup solution for your AD & Exchange.
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MichaelBalackAuthor Commented:
ok
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