2012 DC not replicating

We have 3 DC's.  2 2008 R2 and 1 2012 R2 which is a Hyper-v VM.  We found out today that files in the Sysvol folder are not replicating from or to the 2012 DC.  
I put text files in the folders of all three servers.  The 2 2008 servers replicated almost immediately.  The 2012 never did.
I did a manual replication and it didn't help.
We ran repadmin /showrepl and it shows replicating from the 2012 server to the 2008 was fine.  It also shows replicating from the 2008 to the 2012 was fine.

Where do I being to find the problem?
J.R. SitmanIT DirectorAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Andrej PirmanCommented:
Here is nice tutorial with explanations, most suitable for your scenario at the end: http://windowsitpro.com/active-directory/troubleshooting-active-directory-replication

But first check TIME on all domain controllers - if it's more than 5 minutes apart, DC won't replicate.
Check DNS if DC's are pointing to each other's DNS, not to any other DNS server, particulary not to external ones.
On 2012R2 you can also add DFS Management Tools under Server Features and use that tool to create diagnostic report. But this tool won't manage SYSVOL replication, as it is managed using different replication mechanism.
Specifically for SYSVOL here's nice troubleshooting guide: http://windowsitpro.com/windows-server-2012/fixing-broken-sysvol-replication . After you find the cause, and if it's not trivial, like time out of sync, you will most probably need to perform authoritative resync - this means, manually set which SYSVOL replica is stale, so DFSR mechanism will not hold it back out of sync.
J.R. SitmanIT DirectorAuthor Commented:
We are looking into it.  I'll post when I have more data.
J.R. SitmanIT DirectorAuthor Commented:

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
J.R. SitmanIT DirectorAuthor Commented:
Found our own solution.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Active Directory

From novice to tech pro — start learning today.