ZyXEL ISG50-PSTN User Guide - Page 659
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Chapter 50 Certificates 50.3.2 The Trusted Certificates Import Screen Click Configuration > Object > Certificate > Trusted Certificates > Import to open the Trusted Certificates Import screen. Follow the instructions in this screen to save a trusted certificate to the ISG50. Note: You must remove any spaces from the certificate's filename before you can import the certificate. Figure 438 Configuration > Object > Certificate > Trusted Certificates > Import The following table describes the labels in this screen. Table 261 Configuration > Object > Certificate > Trusted Certificates > Import LABEL File Path DESCRIPTION Type in the location of the file you want to upload in this field or click Browse to find it. Browse OK Cancel You cannot import a certificate with the same name as a certificate that is already in the ISG50. Click Browse to find the certificate file you want to upload. Click OK to save the certificate on the ISG50. Click Cancel to quit and return to the previous screen. 50.4 Certificates Technical Reference OCSP OCSP (Online Certificate Status Protocol) allows an application or device to check whether a certificate is valid. With OCSP the ISG50 checks the status of individual certificates instead of downloading a Certificate Revocation List (CRL). OCSP has two main advantages over a CRL. The first is real-time status information. The second is a reduction in network traffic since the ISG50 only gets information on the certificates that it needs to verify, not a huge list. When the ISG50 requests certificate status information, the OCSP server returns a "expired", "current" or "unknown" response. ISG50 User's Guide 659
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