dcdiag test of domain controller

The test

If all is well this powershell command should produce no output.

dcdiag | sls -pattern "failed|error" -Context 2

If you get "failed test DFSREvent"

This is what the error looks like:

>          There are warning or error events within the last 24 hours after the
           SYSVOL has been shared.  Failing SYSVOL replication problems may cause
           Group Policy problems.
>          ......................... PDCSRV failed test DFSREvent

Usually you get such errors because DC2 is not available (e.g. because it started after PDCSRV).

A) THE BEST OPTION is to run a DFS Replication Health Diagnostic

You start it like this:

Start , select Replication click and Next, Next, ...

If the health report looks like this (0 errors, all servers reporting) you are OK:

B) ALTERNATIVELY IF YOU WANT to check the errors then use these 2 commands:

FIRST A PLAIN TEXT VIEW WITH THE ERRORS (only keeping the most important data for each event)

$Yesterday = (Get-Date) - (New-TimeSpan -Day 1)
Get-Eventlog -LogName 'DFS Replication' -After $Yesterday | ? {($_.EntryType -Match "Error")} | Select -Property Message,Source,TimeGenerated | fl
#\____________________________________/ \_______________/   \_______________________________/   \___________________________________________/ \____________
#get the event logs from DFS-R subsystem  last 24hrs only    keep only Errors                    keep only these properties of each event      format as list 

THEN A GUI VIEW (including warnings and all event data -- you can filter them out easily):

$Yesterday = (Get-Date) - (New-TimeSpan -Day 1)
Get-Eventlog -LogName 'DFS Replication' -After $Yesterday | where {($_.EntryType -Match "Error") -or ($_.EntryType -Match "Warning")} | ogv