Connect to a SQL Server DB which is on a client Network while you are using your office PC

Trusted Authentication will use the credentials that you are logged into the machine with to try and connect, there’s not a way round this, if you want to use trusted authentication for management studio, you need to be logged on to your machine with an account that is allowed access to SQL, if not then you will have to use SQL authentication.

Try this: Use RUNAS to set your Windows Auth domain for database connections

runas /user:domain\user "C:\Program Files\Microsoft SQL Server\90\Tools\Binn\VSShell\Common7\IDE\ssmsee.exe"

runas /user:domain\user "C:\WINDOWS\system32\mmc.exe /s \'C:\Program Files\Microsoft SQL Server\80\Tools\BINN\SQL Server Enterprise Manager.MSC\'"

runas /user:domain\user isqlw

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Example:

runas /netonly /user:cricket\mdatta " C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn\VSShell\Common7\IDE\ssms.exe"

runas /netonly /user:cricket\mdatta isqlw