DFS error

hello, 

I currently configures the DFS share between two servers. 
explanation: 
- 1 Domain 
- 2 servers (There are each at a remote site connected via VPN) (PDC1, PDC2) 

So I set up the DFS: 
First test: 
- PDC1 a test folder on the C: drive 
- PDC2 a test folder on the C: drive 

This sharing files instantly (ok) 
__________________________________ 

Second test (and the part I need): 
- PDC1 a test folder on drive E: 
- PDC2 a test folder on drive E: 

Sharing does not work 

And this with the same configuration for DFS in the same replication group. 
The servers are domain controller, and drive E is a second hard drive or are store "data" 

Do not hesitate to ask me for clarification, I'm blocking. 

thank you