We enabled the TLS 1.0 protocol by setting the following value. We confirmed that all SSL 2.0, SSL 3.0 & TLS 1.0 were disabled and this is not an ideal scenario. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\TLS 1.0 \Serverīased on these values, we figured-out that none of the security provider protocols were enabled. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 3.0\Server HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL\Protocols\SSL 2.0\Server But in my case, when we checked the values for these registry keys on the target SQL Server, the following were the values. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNELīy default, you may not find the below registry keys, which is completely fine. Hence, we directly jumped to the SCHANNEL registry hive to check the values. When we tried the connection from the UDL file, we see a different error message for this reason, but this error message was more straightforward. So different SQL Drivers/ Providers throws different error messages for the same issue. E.g (OLE DB provider for SQL Server / SQL Server Native Client etc.). These error messages are thrown from the actual SQL Server drivers / providers that are used to establish the connection to the SQL server. “…Īn error occurred during the pre-login handshake” If the SQL Server doesn’t respond to this request from the client in a timely fashion or fails to respond due to any internal machine-level issues, we end-up at this particular error message. The client application checks with the SQL Server on the TDS protocol version to be used henceforth for the communication, the login passed by the client application (Windows authenticated login or SQL Authenticated Login), whether there is any client-side or SQL Server connection encryption using SSL certificates or TLS etc. Means that the client application was able to complete the TCP 3-way handshake properly (hence you notice “Ī connection was successfully established with the server Then it is worth checking the below settings.Īn error occurred during the pre-login handshake But usually, if you see these 2 specific error messages from SQL Server Management Studio & UDL file. There are numerous reasons on why you may witness these error messages. The Dedicated administrator connection (DAC) was also throwing a “Login timeout expired.” error. SSL Security error.įorcing the connection to use any other protocol like TCP, Named Pipes & Shared Memory also throws the same error message. Test connection failed because of an error in initializing provider. Using a UDL file, we saw the following error message, (provider: Shared Memory Provider, error: 0 - No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233) When we try to connect to the SQL Server instance using the SQL Server Management Studio, it may fail with the following error message,Ī connection was successfully established with the server, but then an error occurred during the pre-login handshake. ISSUE DESCRIPTION FROM SQL CONNECTIVITY STANDPOINT: In my case) or improper application of Poodle security fix. Mostly you may run into this issue after some improper Windows security update (say This blog is regarding one of most commonly faced issues that you may receive when connecting to the SQL Server.
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