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Frequently Asked Questions

Online Services


Q1: I got a warning message saying “There is a problem with this website’s security certificate”or “This Connection is Untrusted”on the browser when using the library online services. What should I do?

A1: Library online services provided by the Hong Kong Public Libraries make use of certificates issued by the Hongkong Post to encrypt data during network transmission. If you encountered the warning message about the security certificate when using the library online services, please configure your browser to recognize the e-certs issued by Hongkong Post. Please click to download and install the following certificates to your computer to continue using the library online services:
Hongkong Post Root CA1
Hongkong Post e-Cert CA1-10
Hongkong Post e-Cert CA1

The above mentioned certificates can also be downloaded from the Hongkong Post CA Root Certificate website ( )

For instructions of installation of the CA Certificates, please click the following link:

Q2: I didn’t need to download and install the Hongkong Post Root Certificates when using library online services in the past. Why do I need to download it now?

A2: The common browser software installed in most computers supports storage and use of the above-mentioned root certificates. However, the Hongkong Post issued a new sub CA (known as Hongkong Post e-Cert CA 1-10) on 26 February 2010. If the Internet browser on users’PC is not installed with this new sub CA, users need to install it in order to use the library online services. To learn more about the Hongkong Post Root Certificates, please visit the following Hongkong Post website:    

Q3: What do I need to know about data protection when using public library online services and other government online services?

A3: To learn more about information security when using government online services, please visit the following website: