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TLS connect failed error unknown protocol

Discussion in 'E-mail Discussion' started by albatroz, Apr 9, 2018.

  1. albatroz

    albatroz Well-Known Member

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    One of my customers is reporting problems receiving emails from a foreign company
    that is receiving the following error message:

    TLS connect failed: error:140770FC:SSL
    routines:SSL23_GET_SERVER_HELLO:unknown protocol; connected to XXXXXXX

    I opened a ticket on CPanel helpdesk but the problem is still unsolved
     
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  2. cPanelLauren

    cPanelLauren Forums Analyst
    Staff Member

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    Hello,


    This is due to the client attempting to connect using the SSLv2 or SSLv3 protocol which is no longer recognized. Can you tell me the ticket ID number you have open with us?

    The resolution for this is to either request that they use a client that connects with the TLS 1.2 protocol or allow SSLv2 or SSLv3 which is not recommended as the protocol is now considered to be antiquated and vulnerable.

    SSL 3.0 Protocol Vulnerability and POODLE Attack | US-CERT

    SSLv2 DROWN Attack


    Thank you,
     
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