Client and Server cannot communicate...they do not posses a common algorithm

  • Hi,

    has anyone encountered this error when trying to connect from a SQL Server 2014 instance to a SQL Server 2008 instance?:

    'A connection was successfully established with the server, but hen an error occurred during the login process. (Provider: SSL Provider, error: 0 - The client and server cannot communicate, because they do not possess a common algorithm.) (Microsoft SQL Server)
    The client and server cannot communicate, because they do not possess a common algorithm'

    Any help will be appreciated...

  • Do you have tls1.0 disabled?

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    "Ya can't make an omelette without breaking just a few eggs" 😉

  • On the client or server side? Let me verify...

  • Yes. TLS 1.0 is disabled for both client and server.

  • EMtwo - Monday, April 9, 2018 4:51 PM

    Yes. TLS 1.0 is disabled for both client and server.

    What `are the exact versions of the 2 instances?

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    "Ya can't make an omelette without breaking just a few eggs" 😉

  • Microsoft SQL Server 2014  64-bit  Standard Edition and  Microsoft SQL Server 2008 R2 SP1 64-bit Enterprise Edition.

  • So, after doing some research,  a suggested solution is to enable TLS 1.0 in the registry??? Would you recommend this? Your advice is appreciated. Thanks.

  • Hello:
    So, enabling the TLS 1.0 in the registry on the SQL Server 2014 Server solved my problem. 

    Thanks for your attempt to help me solve my issue, Perry Whittle.

  • EMtwo - Tuesday, April 10, 2018 7:55 AM

    Microsoft SQL Server 2014  64-bit  Standard Edition and  Microsoft SQL Server 2008 R2 SP1 64-bit Enterprise Edition.

    What are the exact version?
    use the following query against each instance

    SELECT @@version

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    "Ya can't make an omelette without breaking just a few eggs" 😉

  • EMtwo - Wednesday, April 11, 2018 9:22 AM

    Hello:
    So, enabling the TLS 1.0 in the registry on the SQL Server 2014 Server solved my problem. 

    Thanks for your attempt to help me solve my issue, Perry Whittle.

    Don't do this yet!
    Provide the sql server versions you are using

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    "Ya can't make an omelette without breaking just a few eggs" 😉

  • Microsoft SQL Server 2008 R2 (SP1) - 10.50.2550.0 (X64)
        Jun 11 2012 16:41:53
        Copyright (c) Microsoft Corporation
        Enterprise Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1)

    Microsoft SQL Server 2008 R2 (SP1) - 10.50.2550.0 (X64) Jun 11 2012 16:41:53 Copyright (c) Microsoft Corporation Enterprise Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1)

  • EMtwo - Wednesday, April 11, 2018 11:08 AM

    Microsoft SQL Server 2008 R2 (SP1) - 10.50.2550.0 (X64)
        Jun 11 2012 16:41:53
        Copyright (c) Microsoft Corporation
        Enterprise Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1)

    Microsoft SQL Server 2008 R2 (SP1) - 10.50.2550.0 (X64) Jun 11 2012 16:41:53 Copyright (c) Microsoft Corporation Enterprise Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1)

    What version is the 2014 instance?
    in order to support TLS 1.2 you need to apply the following patches in the following link to sql server 2008 R2

    https://support.microsoft.com/en-gb/help/3135244/tls-1-2-support-for-microsoft-sql-server

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    "Ya can't make an omelette without breaking just a few eggs" 😉

  • My bad, here it is: 
    Microsoft SQL Server 2014 - 12.0.4100.1 (X64)
        Apr 20 2015 17:29:27
        Copyright (c) Microsoft Corporation
        Standard Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: )

  • EMtwo - Wednesday, April 11, 2018 1:25 PM

    My bad, here it is: 
    Microsoft SQL Server 2014 - 12.0.4100.1 (X64)
        Apr 20 2015 17:29:27
        Copyright (c) Microsoft Corporation
        Standard Edition (64-bit) on Windows NT 6.2 <X64> (Build 9200: )

    ok so check the link i posted

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    "Ya can't make an omelette without breaking just a few eggs" 😉

  • Thank you.

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