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The login packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library. [CLIENT: XXX.XX.XX.XX]

  • November 7, 2011 at 5:38 pm

    #259642

    Hi,

    We run a PHP website with SQL Server 2008 R2 back end and for as long as I can remember we have been hit with the following alert:

    The login packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library. [CLIENT: XXX.XX.XX.XX]

    The IP Adress listed in the Client tag is one of our web servers.

    On average we can get anything from 20->60 of these message in 1 day - sometimes we can bit hit with anything up to 50 in a matter of seconds....

    Having been searching online but not really getting anywhere - any ideas out there?

    Thanks in advance,

    JayK

  • November 7, 2011 at 5:59 pm

    #1404233

    The login packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library. [CLIENT: XXX.XX.XX.XX]

    You'll want to do what is says in the error message, contact the vendor that made your client library on the web server.

  • May 1, 2018 at 3:43 am

    #1988737

    I dont know if this is any help to anyone anymore but i encountered this error yesterday night and it seems our CISO was running a scanner to check the database for vulnerabilities

    Hope this helps

    Kal

  • April 4, 2019 at 5:38 pm

    #2793660

    I experienced the same error messages. It was determined to be a vulnerability scanner at work.

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