Error; Stream has gone down (4046239)

Affected Product Version – NetVault any
Affected Module & Version – All
OS Version – any
Application Information – N/A

Description: File System plugin backups fail. Error is Stream has gone down.

Causes

1- Anti virus was running upon several clients and it was blocking the nvfs.exe processes, which in turn, closed the stream connections.

2- Error message (Fatal error during TCP send: Connection aborted due to timeout or other failure (10053).

 10053 is a WSAECONNABORTED error and backup server is Windows 2003, so the customer could check the hotfix:
  "Error code when you run a network program that uses a Winsock connection on a computer that is running Windows Server 2003: WSAECONNABORTED (10053)" 

WORKAROUND:
1- Disabling the Anti virus on the machines or allowing the nvfs.exe process thru anti virus software.

2- Apply this Microsoft solution https://support.microsoft.com/en-us/kb/931319