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how do i change the domain controller in use by exchange 2010 hub transport

I'm running exchange 2010

Under exchange managment console > server configuration > hub transport >servername
If I click on the syetm settings tab I see a domain and global catalog server called test.x.x.x

I want to change this from test.x.x.x to mail.x.x.x.x

test.x.x.x is a dc and gc for a server in my network that is on the other end of a vpn tunnel. if my tunnel goes down for any reason my exchange users can no longer authenticate into outlook web access because the global catlog server cna't be found. I'd like to change this setting to use the domain controller that is on the same subnet as my exchange server
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danielswanson
Asked:
danielswanson
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2 Solutions
 
George SasIT EngineerCommented:
Do you have this DC configured on the same site in AD Sites and Services ?
Exchange will automatically detect the DC's with GC and use the ones available. And will only look for GC DC's.

Are you sure your DC is also a GC ?
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endital1097Commented:
exchange uses ad sites to determine the domain controllers it will use for communications
use ad sites and services to verify your site and subnet configuration
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danielswansonAuthor Commented:
I have 3 servers under default first name site. My dc I want to use is a dc and a gc and is listed as so under first name sites. Do i need to add a subnet under sites and services in order to configure this like I need.

Currently exchange is on network 192.168.2.0/24. My dc/gc i want to use with exchange is 192.168.2.10
My other domain controller is on 192.168.1.0. currenlty exchange is using the dc on the 192.168.1.0 network
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endital1097Commented:
yes, you need to create another site (ex. DR site) and two subnets 192.168.1.0/24 and 192.168.2.0/24
associate the appropriate subnet with site
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danielswansonAuthor Commented:
Thanks guys. I ran into trouble with my dc/gc failing file replication services. Once I fixed the file replication issues and created the sites, exchange started usibng the correct dc/gc. Thank you I'm splitting the points.
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