shadow copy components backup failing in a SQL 2008 server
Whie trying to take the full filesystem (OS level )backup of a Windows SQL server using NetBackup 188.8.131.52, it takes quite time to start and runs for a while and after that we are getting "Network timeout" error. But DB backup of this server using NetBackup is/was working fine. After some research, we suspected that there could be an issue with SQL Server VSS writer and so enabled TCP/IP under "Protocols for MSSQL Server" which is under SQL server network configuration of SQL server configuration manager. Since then backup is working fine. It is apparent that after enabling TCP/IP, SQL server VSS writer has allowed taking backup of its files at OS level. The backup was successfull previously prior to these changes as well. We just faced backup failure for a week .
But the question here is, how the backup was successful previously before these changes for some days?