ShadowProtect ran smoothly for months. Installed Vipre Anti-Virus (GFI Business Agent is the service. Rebooted server. When the next scheduled ShadowProtect backup job ran, it caused the server (which is Windows 2008 R2 Hyper-V virtual server) to lose it's network connection. I could still get into server through Hyper-V manager and things seemed mostly normal, just no network. (Statically assigned IP.) Tried restoring network by disabling NIC, which locked up the server. Turned off server and started it back up. Checked to see if things were back to normal and they appeared to be. Restarted ShadowProtect job and lost network connection again. This time I restarted the server and disabled ShadowProtect for further research. I can't find any event logs related to hardware failure or NIC failures. There are plenty of events about not being able to communicate but no indication why... Vipre is still running now but now ShadowProtect. I'll be opening a ticket with StorageCraft but I'm afraid they'll tell me that it's a Vipre Anti-Virus issue. Any thoughts at all on what to look for would be greatly appreciated.