A Connection Was Successfully Established With The Server But Then An Error Occurred During The Pre Login Handshake

Seems like I had a unique situation - other than all the answers posted here. I connect to the database with a restricted login (mapped to the …
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Check that TCP/IP protocol is not enabled for clients. Without TCP/IP protocol you can not access the sql server from other clients. Following is the method to enable the protocol.
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Note! If you do want to use encrypted connection then you cannot use SSL and you must use TLS since starting with SQL Server 2016 (13.x) Secure Sockets Layer (SSL) …

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Connections to the SQL Server fails after certain windows update and getting the below error: Error: (provider: SSL Provider, error: 0 - The Local Security Authority cannot be contacted) -- …

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System.Data.SqlClient.SqlException (0x80131904): Connection Timeout Expired. The timeout period elapsed while attempting to consume …
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Hi All, All of a sudden we are getting below issue when connecting instance through SSMS. Please advise, thank you. TITLE: Connect to Server ----- Cannot connect to …

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User121216299 posted. Hi Shaik Umarfarook, If you are working with ASP.NET Application then try to clean your VS solution. Then try to rebuild the project.

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You can resolve this issue by fixing the underlying Certificate Validation issue which will make using Trust Server Certificate = True when connecting unnecessary or you can work around this be setting Trust Server Certificate = …

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Solved: hi all, since this morning i suddenly have this message "DataSource.Error: Microsoft SQL: A connection was successfully established with

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Hi All, All of a sudden we are getting below issue when connecting instance through SSMS. Please advise, thank you. TITLE: Connect to Server ----- Cannot connect to …

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1)Remove all SSL certificates and encryption options from IIS – both at the website level (for example from the “Default Web Site”) and at virtual directory level. Basically if you …

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Hi Try to turn off the pooling, in connection string i.e pooling = false, this has solved my problem , even though the performance of application slows down but it works. Sudershan

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First published on MSDN on Jul 09, 2015 This blog is regarding one of most commonly faced issues that you may receive when connecting to the SQL Server. Mostly you may run into this …

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User-454560952 posted Hi, I am having such a problem. I have SQL Express installed on the windows 2003 server and originally I installed instance1 of SQL Server 2005. …

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MSDN Community Support Please remember to click "Mark as Answer" the responses that resolved your issue, and to click "Unmark as Answer" if not. This can be …

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Frequently Asked Questions

Why am i getting an error during the pre login handshake?

A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: HTTP Provider, error: 0 - ) It is usually caused by a Certificate Validation issue.

Why am i getting an error 121 during the pre login handshake?

A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: TCP Provider, error: 0 - The semaphore timeout period has expired.) (Microsoft SQL Server, Error: 121) Show activity on this post. Maybe the user you are using is not able to connect to the master database.

Why did the timeout period elapsed while attempting to consume pre login handshake?

The timeout period elapsed while attempting to consume the pre-login handshake acknowledgement. This could be because the pre-login handshake failed or the server was unable to respond back in time.

Why was the client unable to establish a connection?

------------------------------ADDITIONAL INFORMATION:The client was unable to establish a connection because of an error during connection initialization process before login.

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