Hi,Richard

What does the account of Module Instance set.

Module Instance -- settings -- Login info account

Do you want to limit this account more?

I explain Startup SACN.

When the service of SQLServer and SQLAgent starts, it is started by the Alias name.

This does a good working to do the cluster.

reference

* The flow of the change in the computer name is shown.

Node1 --- SRV1

Node2 --- SRV2

Alias --- SRV3

Virtual IP-------------------------------SRV2

alias SRV3----------------------------SRV2

mirror data-----------------------------SRV2

StartupSacn ---> Changing the active computer name

SQLservice----------------------------SRV3

Agent service-------------------------SRV3

StartupResacn ---> Returned to physics host name
After Agent service start----------SRV2

Please look at SYSTEM Log and SQLServerLog(Application Log) about this evidence.

Source:EventLog
EventID:6011

Source:MSSQLSERVER

EventID:17663