I login to SQL Server 2008 management studio each morning, it works all day just fine. When I come in the next morning and try to run a query, it asks me to login again.
Where is the setting defined which controls this "login timeout"?
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Possible simple reasons:
Connection can be closed from SQL-Server side if your admins make some kind of maintenance and simply kill connections, or if your Server is running in Virtualized envronment, it's instance could be "paused" to make a snapshot.
you can start analysing using simple tool: when you go home, just run:
ping -t NAMEOFYOURSERVER >c:\temp\log.txt
this will start permanent ping and when you will come next day - just Ctrl-Break and look into the file if there are Time-Outs. This way you will know if at least IP connection was alive.