Domain Replication Issues
Use the following troubleshooting steps when running into Domain Replication issues. These will sometimes happen when replacing DC’s without going through the proper replacement steps which should be the following:
Add the new DC’s => Promote them.
Integrate them => Configure roles and services.
Take the originals offline => Keep them running side by side at least for 24 hours if possible.
NOTE: DHCP/DNS issues can usually be resolved by adding the IP as a secondary on the new servers NIC once you power the old server off.
On the domain controller, Run =>
eventvwr.msc=> Check the logs regarding Active Directory. If there are errors or warnings, try the following:
Type each of the commands and study their output:
1 2 3 4 5 6 7
repadmin /showrepl * /errorsonly >log.txt # see [this](https://technet.microsoft.com/en-us/library/cc770963.aspx) repadmin /replsummary repadmin /syncall dcdiag /c /e /v /q /f:results.txt # see [this](https://technet.microsoft.com/en-us/library/cc731968.aspx) netdiag /q /v /dcAccountEnum /l >>log.txt# see [this](https://technet.microsoft.com/en-us/library/cc731434.aspx)