By specifying the web browser used for this system as the [Default] web browser, failure of the client authentication (including access failures) should be prevented.
In this document, setting up the following prior to retrieving the certificate is recommended.
With Firefox, click on the Menu icon and select [Options] to get the Options screen.

 
 
IN the [General] screen, click [Make Default...] in the [Startup] field.

1. According to the instruction in [2-2-1. Notification of URL for the Certificate Retrieval], access the certificate retrieval URL provided in the e-mail.
   In the password prompt, enter the Access PIN you have received.
   
   <<Retrieving for a new/lost certificate?>>
   If you get the [User Identification Request] dialog box to select the digital certificate, click [Cancel].
    
     
   <<Updating for an expiring certificate?>>
   If you already have a certificate and are updating that, select the one in current use in the certificate choice field.
   
    
2. According to the instruction in [2-2-1. Notification of URL for the Certificate Retrieval], access the certificate retrieval URL provided in the e-mail.
   In the password prompt, enter the Access PIN you have received. 
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      • To change the language, click the link in the upper right corner. 
          
        Clicking [日本語 (Japanese)] changes the language to Japanese.
        Clicking [English] changes the language to English
   .
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   Once you complete authentication by the Access PIN, the screen will change to the Key Length selection.
   Select a Key Length. Select [High Grade] for the Key Length and click [Issue].
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   When the Key generation completes, the following dialog box will pop up.
   Click [OK]. (You can leave all checkboxes unchecked.)
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   Once the certificate issuing is successful, the following dialog box will pop up. Click [OK]
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   2. Now, the screen changes to the [
   Take
   1. Issue a Certificate] screen, make sure that the certificate is actually
   installed in the web browser
   1. downloaded. 
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   Follow the steps in the [blue box] shown in your browser, open the [Certificates] dialog box,
   make sure that [a user name in full] is specified to [Issued To] and [Open Domain CA - G4] or [Open Domain S/MIME CA] is specified to [Issued By], and click [Close].
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   2. If the certificate is successfully issued, the certificate will start downloading.
      When the download is complete, click the "X" button on your browser to close the browser.
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   1. <The certificate actually downloaded>
      
      Refreshing your Firefox will delete the captured certificate. Be careful and well reminded that you have to redo all relevant steps (from requesting through certificate issuing and install) if the certificate is lost by the deletion.

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If the [Select a Certificate] dialog box will not pop up, you need to set up the following.
Click the [Tools] icon -> select [Options] -> [Privacy & Security] menu, and select [Ask you every time (A)] for [When a server request your personal certificate] in the [Certificate] field.