Why LOGIN7 returns empty reply using TDS protocol

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I am using Tabular Data Stream protocol to login to SQL Server. The PreLOGIN is successful and returns message with as 4. Where as the LOGIN 7 returns empty message. And server closes the connection.

How to make a successful login using LOGIN 7 ?. What are the minimum requisite to use LOGIN 7 ?.

Do we require to use any details from PRE LOGIN messages in LOGIN 7 ?. Where i can find the samples for a proper PRELOGIN and LOGIN 7 using Tabular Data Stream protocol.

This is the server response from the PRELOGIN client request:

04 01 00 2B 00 00 01 00 00 00 1A 00 06 01 00 20
00 01 02 00 21 00 01 03 00 22 00 00 04 00 22 00
01 FF 0C 00 17 88 00 00 00 00 00

Thank you ..............

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