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Tips For Resolving Error Code 18 In Proxy Security Certificate


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    You may encounter error code 18 for the proxy security certificate. It turns out there are several ways to fix this problem, and we’ll discuss that in a minute.



    • At least 3 readings
    • Applies to:
      Outlook 2013, Microsoft Outlook 2010, Microsoft Office Outlook 2007, Exchange Online


    When Microsoft Outlook tries to connect to a specific server using a remote operation method call (RPC) or secure HTTP connection (HTTPS), you will receive only one of the following error messages:

    • Personal error message 1

      There is definitely a problem with the security certificate of the proxy server% s. Outlook cannot connect to all of these servers. (% S)

    • Error message 2

      proxy server security certificate error code 18

      Almost all problems occur with the proxy server status certificate,% s. The name in the master security certificate is invalid or does not match the name of your current site at all. Outlook cannot connect to this server? (% s)

    • Test 3 error message

      There is a problem with the security certificate for proxy server% s. The security certificate does not come from the CA involved. Outlook cannot connect to this server. (% S) “

    • Error of thought 4

      There is a problem with the server’s security certificate. The name in the security certificate is invalid and / or may not match the name associated with the target site Outlook cannot connect to proxy server (error code 0)

    Notes On Common Error Messages

    • The% s placeholder is a specific property of the 001f6622 Outlook profile. This is considered the name of the Microsoft Exchange RPC Server proxy.

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    (% s) is my error code.

    proxy server security certificate error code 18

    For error message 3 and message 2, the error return value is the sum associated with all bitmask certificate issues. See the “More Information” section for more information on bit mask certificate error codes.

    For error message 3, the underlying error code must always be 0x0000008.


    This issue can occur if one or more of the following are true:

    • A certification authority (CA) is required to sign in.
    • You are definitely not a trusted CA at That root.
    • The certificate may not be valid or has just been revoked. Certificate
    • that does not match the website manufacturer.
    • A third party add-on or third-party browser add-on is preventing access.

    Solution 1: Check The Certificate For An Error Message Or 1 2

    Check your certificate. Then contact your system administrator to resolve this Microsoft problem

    1. Log on to the RPC web server or secure server in Internet Explorer. For example, enter https: // www. in the address bar of the web phone and press Enter.


      The server_name placeholder recommends an RPC name server or even a secure name server.

    2. Double-click the lock icon located in the lower right corner of your web browser.

    3. Click on this special Details tab.

    4. Enter information in the following fields:

      • Valid until
        Discipline Valid until indicates the date until which the certificate is valid.
      • Topic
        The information in the Subject field must match the name of the place.

    Solution 2… Securely Install The Root Cause Certificate For Error Message 3

    To normally provide a trusted root certificate on the client, follow these steps:

    1. Click Install Certificate when prompted in the Certificate dialog box.
    2. Click Next.
    3. Select the Put all certificates in mail store check box.
    4. Click Browse. Reliable
    5. Click Root Certification Authorities> OK.
    6. Click Next.
    7. Click Finish.
    8. Click OK. 3:

    Solution. Third Party Add-on May Disable Third-party Browser Add-on During Error 4

    Disable 3rd Party Add-ons

    1. Start Outlook in safe mode to diagnose the problem. To do this, go back to Start> Run, type Outlook./safe, exe and click OK.

      If Outlook starts in safe mode, a third-party add-in may report problems you are experiencing.

    2. Check com for third party add-ons and disable them. To do this, follow these steps:

      1. Currently, from the File menu, choose е “Options”> “Add-ins”.
      2. In the Manage field, click COM Add-Ins> Go.
      3. Uncheck the boxes next to any third-party add-ons that you want to disable.
      4. Restart Outlook.

    For more information, see the Office “Easy Step Six: Start Outlook in Safe Mode” section of the following Microsoft Knowledge article:

    2632425 base How to fix crashes in Outlook 2010 and Outlook 2013

    Disable Third Party Add-ons For Mobile Phones

    Outlook uses Internet Explorer locations for HTTP requests. If this issue is caused by a third-party browser add-on, disable it in Internet Explorer. For more information about these important facts, see the “Disable add-ons in Internet Explorer” section of the following article in the Microsoft Knowledge Base:

    Additional Information

    Bitmask licensing error codes are listed in the following table. Readabilitydatatable = “1”>

    Description error

    FLAG_CERT_REV_FAILED 0x00000001
    FLAG_INVALID_CERT 0x00000002
    FLAG_CERT_REVOKED 0x00000004
    FLAG_INVALID_CA 0x00000008
    FLAG_CERT_CN_INVALID 0x0000010
    FLAG_CERT_WRONG_USAGE 0x00000040

    The server_name placeholder specifies the name of the RPC server and even the name of the secure server.



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    Proxyserver Sakerhetscertifikat Felkod 18
    Codigo De Error 18 Del Certificado De Seguridad Del Servidor Proxy
    프록시 서버 보안 인증서 오류 코드 18
    Proxyserver Beveiligingscertificaat Foutcode 18
    Kod Oshibki Sertifikata Bezopasnosti Proksi Servera 18
    Codice Di Errore Del Certificato Di Sicurezza Del Server Proxy 18
    Fehlercode Des Proxyserver Sicherheitszertifikats 18
    Code D Erreur 18 Du Certificat De Securite Du Serveur Proxy
    Kod Bledu Certyfikatu Bezpieczenstwa Serwera Proxy 18
    Codigo De Erro 18 Do Certificado De Seguranca Do Servidor Proxy