SEP 14 blocks Backup Exec Jobs

Hello

We Have a Domain with SBS2011 .We Use Backup Exec for Backup and Symantec Endpoint Protection as Antivirus and firewall. After Upgrading Symantec Endpoint Protection from 12 to 14 Backup Exec Can’t Execute Backup Jobs. This is Its Error:” V-79-57344-65072 - The connection to target system has been lost. Backup set canceled.”

I Opened all needed ports in firewall (According to Backup Exec Documentation).

By Disabling All Network Treat Protection Features in SEP Clients ; Backup Exec can do its Job Correctly.

Also by Disabling IPv6 in client LAN setting, Backup Exec can do its Job Correctly.

Please Guide me