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Event ID: 17828 Source: MSSQLSERVER

Source
Level
Description
The prelogin packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library. [CLIENT: <IP address>].
Comments
 
From a newsgroup post: "I was having this exact same problem and here is what resolved this issue for me:

1. Go to C:\Documents and Settings\<sql startup account>\Application Data\Microsoft\Crypto\RSA\S-1-5-21...... (where "sql startup account" should be the name of your startup account for sql server)
2. Backup and then delete any files in the S-1-5-21etcetc folder (but do not delete the folder)
3. Restart SQL Server".

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