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.