Exchange Server 2013 how to specify multiple domains?

Question

Microsoft Exchange

Good afternoon!
I ask you to help with solving the issue on GC
There is an Exchange Server 2013 that works through the main DOM1 domain controller We raised
an additional 2 domain controllers DOM2 and DOM3 The
DNS replica and everything else works fine
, but when DOM1 is disabled, the authorization window crashes, as I understand it, the mail server has only a connection with a DOM1 domain controller, how and where can I see links to domains?
Thanks in advance!

Answer 1

1. What is configured in Active Directory Sites and Services? Are the additional controllers global catalog servers?
2. What shows

Get-ExchangeServer -Identity “ExchangeServerName” -status | fl

in the fields CurrentDomainControllers, CurrentGlobalCatalogs, CurrentConfigDomainController?