If you need to FORCE sysvol and netlogon to be shared for a down domain controller, you can add this registry key. You should figure out why your replication is broken, but this will force it onling.
- Login to your Domain Controller that’s having the issue
- Open Regedit
- Browse to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Netlogon\Parameters
- Set SysVolReady from 0 to 1
