DC down, exchange services is down

Hi Support,

I am facing an issue from last two three days is that, when my domain controller is down (ex-pdc) my exchange services (email) is down. FSMO roles already shifted to another domain controller. but the exchange server select the GC of old DC. which cause my services affecting. because the domain windows dump after 30 mins and  email services goes down every 30 mins. I staticly entered the domain controller. but the situation is the same.

Need your help to resolve the issue.
Sajid AzeemManager Data CenterAsked:
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MaheshConnect With a Mentor ArchitectCommented:
before rebooting exchange server, shutdown old DC for time being..
now reboot all exchange servers one by one, specifically follow DAG reboot sequence carefully
move all active databases on one server and reboot passive node, once it up, move databases to that node and reboot another node
for CAS servers, reboot one by one, if they are part of NLB, drain stop node at a time and reboot one server at a time
then check if issue get resolved
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MaheshConnect With a Mentor ArchitectCommented:
configure exchange to look at specific dc by running PowerShell
Then Shutdown old PDC and then reboot exchange, upon reboot it will pickup new dc
After that make sure that exchange is working as expected and then start old dc
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Sajid AzeemManager Data CenterAuthor Commented:
Thankyou mahesh for your time and vlaued comment. Can i reboot all servers including (2 CAS, 2 MBX with DAG and Edge) Servers?
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Sajid AzeemManager Data CenterAuthor Commented:
I configured new DC as static domain controllers. but it wasn't working.
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Sajid AzeemManager Data CenterAuthor Commented:
Thanks Mahesh. I'll do the same by tonight and will give you the feedback.
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Shaun VermaakTechnical Specialist/DeveloperCommented:
Add all other DCs within fast-linked sites as DNS servers on Exchange
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Sajid AzeemManager Data CenterAuthor Commented:
Shaun,

All DC's are in same sites and same VLAN also.
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DrDave242Commented:
Just looking at this from a different angle, is that DC going down a lot? If so, why?
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Shaun VermaakTechnical Specialist/DeveloperCommented:
Then add all DCs as DNS servers
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Sajid AzeemManager Data CenterAuthor Commented:
Dave, it was working fine. But 3 4 days back windows got blue screen and restart after 30 sec. this will effect my email services. We have 7000 active accounts and all are higher positions users. Therefore a mess creating every 30 mins. When I came a solutions, add some dword values in registry and now the Windows is stable. But if that happen again. Then I am again facing the mess with huge amount of calls and disrespect also. Therefore, I need to permanently fix the issue. Thnx
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Sajid AzeemManager Data CenterAuthor Commented:
Shaun, can you please elaborate it to add all dns. Means in DC DNS servers add all DC IPS?
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Shaun VermaakTechnical Specialist/DeveloperCommented:
Means in DC DNS servers add all DC IPS?
No, confirm that in Exchange Client DNS you have the correct DNS server list
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Sajid AzeemManager Data CenterAuthor Commented:
Thanks mahesh  issue was resolved. Now the Exchange Server randomly select the other 3 dc's and mail flow is working.
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Sajid AzeemManager Data CenterAuthor Commented:
Thanks experts for your help and your support.
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