Outlook unable to connect proxy server


  • HY,

    Today morning i try to connect my outlook client in my corporate .Its give me the error

    There is a problem with the proxy server security certificate.the security certificateis not from a trusted certifying authority.

    Outlook is unable to connect to the proxy server error code 18

    feroz syed ;)
    Sunday, December 25, 2011 7:52 AM


  • Hi Feroz,


    This issue may occur if one or more of the following conditions are true,

        1-  The connection to the server requires a certification authority (CA).
        2-  You have not trusted the certification authority at the root.
        3-  The certificate may be invalid or revoked.
        4-  The certificate does not match the name of the site.

    To resolve the issue, read the following link,



    Rashid Kamal,
    • Marked as answer by Feroz syed Monday, December 26, 2011 5:11 AM
    Sunday, December 25, 2011 8:11 AM