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Daniel Forrester

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Exchange server 2013 removed from server 2012 domain and re-joined, now the services won't start

I had to remove the exchange server I currently run from the domain as I had trust issues when trying to login and re-joined the domain and now the exchange services wont load, please help!!
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Systech Admin
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Can you please check the event logs what error are you getting in the event logs
Try running /PrepareAD and /PrepareDomain see if that works, if not you will have to recover the server /recoverserver
Did you reset password for exchange computer account in AD before re-joining in domain.

Also see if error is in respective to certificates... may be your computer certificate is revoked you may need to renew it.

I wont suggest to run prepare ad and prepre domain as there is no issue with your AD.

also check exchange computer membership it should be member of Exchange Servers, Exchange org and Exchange trust Subsystem group.

Last option  is  left with recover server.
The secure channel between the Exchange Server and AD is broken. PrepareAD / PrepareDomain will help you fix that. Certainly there is not issue with AD.
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Zacharia Kurian
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You need to perform server recovery now. Reset Exchange server account in AD, rejoin server to domain. Then run below command

Setup /m:RecoverServer /IAcceptExchangeServerLicenseTerms

Refer:
https://technet.microsoft.com/en-us/library/dd876880(v=exchg.150).aspx

If this server is part of DAG, then recovery process it bit complicated. You can check my article for 2010, steps will be same for 2013. If your server is part of DAG, else ignore it and use above method.

https://www.experts-exchange.com/articles/18110/How-To-Recover-Failed-Mailbox-Sever-In-Exchange-2010-DAG-Environment.html
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Daniel Forrester

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excellent Zac, this did the trick and enabled me to run the update.