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SQL Server jobs not running after a password change on the running windows account

The sql server services (agent, db, browser, full text and analisys)  were running on a windows acount, recently we change the password on that acount( previously stopping the services) and changing it on the services as well, but with that change the sql server jobs stop running and the error message on the application event log is:
"The prelogin packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library. [CLIENTE: <local machine>]

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp."

Any help on this issue would be really appreciated!
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valdivie
Asked:
valdivie
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gdemaderiosCommented:
Could you please provide your sql server logs?  They're usually located here:

C:\Program Files\Microsoft SQL Server\MSSQL.#\MSSQL\LOG
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valdivieAuthor Commented:
Here is the error shown in the error log:
2008-10-07 13:34:19.48             Error: 17828, gravedad: 20, estado: 3.
2008-10-07 13:34:19.48             The prelogin packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library. [CLIENTE: <local machine>]
2008-10-07 13:38:30.65             Error: 17828, gravedad: 20, estado: 3.
2008-10-07 13:38:30.65             The prelogin packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library. [CLIENTE: <local machine>]
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gdemaderiosCommented:
Are you seeing any other errors in that log?  I don't think that that is what is causing your problem.  Perhaps this line:  Error: 18456, Severity: 14, State: 16.

More than likely the user doesn't have read/write permissions to the mdf file.  Can you verify that the permissions are okay and that error 18456 is or is not showing up in the log file?
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