Sql state 08001 native 18 ошибка безопасности ssl

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 issue after some improper Windows security update (say

KB2655992

in my case) or improper application of Poodle security fix.

ISSUE DESCRIPTION FROM SQL CONNECTIVITY STANDPOINT:

When we try to connect to the SQL Server instance using the SQL Server Management Studio, it may fail with the following error message,

Error:

TITLE: Connect to Server

——————————

Cannot connect to <mySQLServer>.

——————————

ADDITIONAL INFORMATION:

A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: Shared Memory Provider, error: 0 — No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233)

For help, click:

http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=233&LinkI…

——————————

BUTTONS:

OK

——————————

Using a UDL file, we saw the following error message,

—————————

Microsoft Data Link Error

—————————

Test connection failed because of an error in initializing provider. [DBNETLIB][ConnectionOpen (SECDoClientHandshake()).]SSL Security error.

—————————

OK

—————————

Note:

Forcing the connection to use any other protocol like TCP, Named Pipes & Shared Memory also throws the same error message. The Dedicated administrator connection (DAC) was also throwing a “Login timeout expired.” error.

OUR FINDINGS & INFERENCE:

There are numerous reasons on why you may witness these error messages. But usually, if you see these 2 specific error messages from SQL Server Management Studio & UDL file. Then it is worth checking the below settings.

As per the error message received, “…


an error occurred during the pre-login handshake



.”

and “


[DBNETLIB][ConnectionOpen (SECDoClientHandshake()).]SSL Security error

.”

means that the client application was able to complete the TCP 3-way handshake properly (hence you notice “


A connection was successfully established with the server


”), but during the


pre-login handshake,


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. 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. (wiz. “…


an error occurred during the pre-login handshake”


)

These error messages are thrown from the actual SQL Server drivers / providers that are used to establish the connection to the SQL server. E.g (OLE DB provider for SQL Server / SQL Server Native Client etc.). So different SQL Drivers/ Providers throws different error messages for the same issue. 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.

Error:

Test connection failed because of an error in initializing provider. [DBNETLIB][ConnectionOpen (SECDoClientHandshake()).]SSL Security error.

Hence, we directly jumped to the SCHANNEL registry hive to check the values. Wiz.

Target hive:

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecurityProvidersSCHANNEL

CAUSE:

By default, you may not find the below registry keys, which is completely fine. But  in my case, when we checked the values for these registry keys on the target SQL Server, the following were the values.

i)

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsSSL 2.0Server

DisabledByDefault

was set to 1

Enabled

was set to 0

ii)

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsSSL 3.0Server

DisabledByDefault

was set to 1

Enabled

was set to 0

iii)

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.0 Server

DisabledByDefault

was set to 0

Enabled

was set to 0

Based on these values, we figured-out that none of the security provider protocols were enabled. We confirmed that all SSL 2.0, SSL 3.0 & TLS 1.0 were disabled and this is not an ideal scenario.

RESOLUTION:

We enabled the TLS 1.0 protocol by setting the following value.

Under,

HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.0 Server

Set

Enabled

to

1

Rebooted the SQL Server machine for the changes to reflect.

After the successful reboot, we were able to connect to the SQL Server locally without any issues. Also tested the connection from a remote server machine and confirmed that the connections to the SQL Server worked as expected without any issues. SQL server was just a victim here like any other application that uses windows security providers and since all the security provider’s protocols were disabled, the SQL Server wasn’t able to accept any new connection request.

Please drop in your comments or connect with Microsoft BI-ONE CSS team if you are still encountering the same issue even after performing the above steps.

Happy troubleshooting!!!!

Author: Krishnakumar Rukmangathan, Technical Advisor, SQL Server BI-ONE Developer team, Microsoft

Reviewed by: Sunil Kumar B.S, Escalation Engineer, SQL Server BI-ONE Developer team, Microsoft.

This article, suggests a way of resolving the below error message, when you are trying to access SQL Server using “Microsoft OLE DB Provider for SQL Server” and TLS 1.0: [DBNETLIB] [ConnectionOpen (SECDoClientHandshake()).] SSL Security Error

Prior to start writing this article, I was thinking of using a title like “How to still use TLS 1.0”, or something similar, but besides the fact that would have given a wrong message, it would not help so much because many people, usually search for such articles using the error message (SSL Security error)…

So, I anticipate that this article, with this title, would help as many people as possible 🙂

Drop me a line if you find the article useful and why not, subscribe to my newsletter to stay up to date with future articles!

A Few Words About TLS 1.0

TLS 1.0 is considered a deprecated protocol and it is not recommended anymore to be used to secure connections. That’s why many organizations (if not all) transitioned or are in the process of transitioning to newer versions of TLS such as TLS1.1 or above.

However, you may still encounter outdated applications that still need to use this protocol, even for a while for just performing a single operation. One such example, is to try and connect to a SQL Server instance via Microsoft OLE DB Driver for SQL Server using TLS 1.0.

If you are in such situation, I have good news, from a technical aspect, it is still possible to do this.

Read on to learn more.

SQL Server Support for TLS 1.0 and Above

SQL Server still supports all TLS protocols, currently from 1.0 to 1.2. However, depending on the version of SQL Server you have, especially in cases of older SQL Server versions, you might need a patch.

Read this article on SQLNetHub to learn more about SQL Server support for TLS versions.

Now let’s jump to the juicy part of this article and see how finally we can resolve the above error and manage to connect to SQL Server using Microsoft OLE DB Driver for SQL Server and TLS 1.0.

Note that if you are just trying to connect with TLS 1.0 for a while in order to perform a specific task, then make sure to revert the below changes in order to restore the security level of your systems back to their previous level.

Latest Microsoft OLE DB Driver for SQL Server

The first step towards resolving the SSL Security error, is to make sure that the version of the target SQL Server instance you want to connect to, is supported by the driver.

For example, Microsoft OLE DB Driver 18.1 for SQL Server supports connecting to SQL Server 2012 or later.

For older versions of SQL Server, you will need to find an earlier version of Microsoft OLE DB Provider for SQL Server as well.

You can find the latest version of the OLE DB driver here.

Useful details:

The Microsoft OLE DB Provider for SQL Server, allows ADO to access Microsoft SQL Server. However, This is an older driver and it is not recommended to be used driver for new development, since it is deprecated.

The new OLE DB provider is called the Microsoft OLE DB Driver for SQL Server (MSOLEDBSQL) which will be updated with the most recent server features going forward (learn more)

Registry Changes

The next step is, to edit the Windows Registry (* always be careful when messing up with Windows Registry – only certified engineers should do that).

To enable TLS 1.0 in Windows

In Windows Registry, add the below dword keys:

[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.0Server]

• “Enabled”=dword:00000001
• “DisabledByDefault”=dword:00000000

[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.0Client]

• “Enabled”=dword:00000001
• “DisabledByDefault”=dword:00000000

To disable TLS 1.0 in Windows

[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.1Server]

• “Enabled”=dword:00000000
• “DisabledByDefault”=dword:00000001

[HKEY_LOCAL_MACHINESYSTEMCurrentControlSetControlSecurityProvidersSCHANNELProtocolsTLS 1.1Client]

• “Enabled”=dword:00000000
• “DisabledByDefault”=dword:00000001

Learn more about the above registry changes in this MS Docs article.

Local Security Policy

The next step is to check the Local Security Policy on the database server.

So, in Local Security Policy on the Database Server, make sure that the setting “System Cryptography: Use FIPS compliant algorithms for encryption, hashing, and signing” is disabled.

If you want to learn more about this security option, you can check this MS Docs article.

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Server Protocols, Ciphers, Hashes and Client Protocols

The last step in this troubleshooting guide, is to use IISCrypto, which is an excellent free tool, that allows you to control which protocols, ciphers, and more are enabled (or not) on a Windows server.

That being set, you will need to run IISCrypto and make sure that the “TLS 1.0” Server and Client Protocols, as well as the”SHA” hash are enabled.

Here’s a screenshot of IISCrypto, running on my PC, having TLS 1.0 and “SHA” enabled for illustration purposes:

Note that, if finally you need to perform any changes using IISCrypto, you will need to restart the server.

Actually, for any changes you might need to perform, it is recommended to restart the server.

A Piece of Advice

As mentioned in this article’s beginning, TLS 1.0 is considered a deprecated protocol and it is not recommended anymore to be used to secure connections.

Instead, you should be using newer versions of TLS.

In case you just need to switch to TLS 1.0 for performing an ad hoc task, you need to make sure that after you completed the task, you revoked any changes you might have applied, and disable again TLS 1.0 and the “SHA” hash.

See More

Check out DBA Security Advisor, a SQL Server security tool to assess your SQL Server instances against a rich set of security checks and get security best practice recommendations.

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Reference: SQLNetHub.com (https://www.sqlnethub.com)

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