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NatalieBennett-1042 avatar image
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NatalieBennett-1042 asked id-chaddb commented

Exchange 2016 cu 19 failing because OWA (Exchange Back End) couldn't be found - ON WRONG SERVER

Trying to install CU 19, and getting [ERROR] The operation couldn't be performed because object 'XXX\OWA (Exchange Back End)' couldn't be found on 'YYY.ZZZ.local' YYY is the domain controller, and XXX is the Exchange server. I have no idea why it is looking for the OWA (Exchange Back End) directory on the domain controller. It is definitely on the Exchange server. this server is down until I can fix this, or restore from backup, and lose a day.

office-exchange-server-administration
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NatalieBennett-1042 avatar image
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NatalieBennett-1042 answered

I fixed the problem myself - went into ADSIEdit, and realized the entry for "owa (Exchange Back End)" was missing entirely. Not sure how that happened, since this was a working server in production. I created it from scratch, setting most of the attributes I could based on a working server (another client) and the settings that were in this server for owa (Default Web Site). If anyone is having the same problem, the location is CN=owa (Exchange Back End),CN=HTTP,CN=Protocols,CN=SERVER,CN=Servers,CN=Admin Group Name, CN=Administrative Groups,CNDOMAIN,CN=Microsoft Exchange,CN=Services,CN=Configuration,DC=Domain,DC=com or local, or whatever.

Before I did this, I tried the /prepareAD switch, but didn't do the terms acceptance, so maybe that and prepareschema would have worked Not sure. The OWA virtual directory did exist, but recreating wouldn't have worked, since the CU19 install failed at a point that rendered the Exchange Management Shell not working.

Still having some problems with EAC and http 404 errors after login, and I've recreated the directories, and reset the authentication to Windows, which is supposed to be the fix, but so far no dice. I will figure that out. The main thing is that email is flowing again!

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AshokM-8240 avatar image
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AshokM-8240 answered

Hi @NatalieBennett-1042 ,

Exchange virtual directory information will be stored in AD.

Any issues with AD replication or commuication issues between Exchange & AD?

Is this is a new install or upgrade. Incase of upgrade from previous CU, based on the current CU, Exchange may need schema update, so try running the below commands before the CU install

Setup /PrepareSchema /IAcceptExchangeServerLicenseTerms
Setup /PrepareAD /IAcceptExchangeServerLicenseTerms

Also, check if the OWA virtual directory exist in the Exchange server. If not try re-creating it once. If still errors occurs, please share the error message from Exchange setup log by covering personal information.

https://theitbros.com/recreate-owa-ecp-virtual-directories-exchange-server-2016/

If the above suggestion helps, please click on "Accept Answer" and upvote it.

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id-chaddb avatar image
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id-chaddb answered

Running into a similar issue installing Exchange 2016 CU21. The upgrade fails on the Client Access Front End Service.

[Error] The operation couldn't be performed because object '[ExchangeServer]\owa (Default Web Site)' couldn't be found on '[DC].domain.com'.

Our OWA isn't in the Default Web Site it's in a custom site. And it's not on the domain controller it's on the Exchange Server. The error makes it look like it's looking on a DC for it. ADSI lists the correct location for OWA in the custom site on the Exchange Server.

Any ideas?

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MarkWatson-6870 avatar image
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MarkWatson-6870 answered id-chaddb commented

Did you manage to fix this?

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I have not yet. Still looking for a solution.

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I ended up re-creating the virtual directories in IIS and then using ADSIEDIT to change AD configuration to use Defaults, I was then able to run the update

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Did you then just move them back to the non-default site after the update?

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