Chapter 29 Troubleshooting
USG FLEX H Series User’s Guide
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1 For My Certificates, you can import a certificate that matches a corresponding certification request that
was generated by the Zyxel Device. You can also import a certificate in PKCS#12 format, including the
certificate’s public and private keys.
2 You must remove any spaces from the certificate’s filename before you can import the certificate.
3 Any certificate that you want to import has to be in one of these file formats:
• Binary X.509: This is an ITU-T recommendation that defines the formats for X.509 certificates.
• PEM (Base-64) encoded X.509: This Privacy Enhanced Mail format uses lowercase letters, uppercase
letters and numerals to convert a binary X.509 certificate into a printable form.
• Binary PKCS#7: This is a standard that defines the general syntax for data (including digital signatures)
that may be encrypted. A PKCS #7 file is used to transfer a public key certificate. The private key is not
included. The Zyxel Device currently allows the importation of a PKS#7 file that contains a single
certificate.
• PEM (Base-64) encoded PKCS#7: This Privacy Enhanced Mail (PEM) format uses lowercase letters,
uppercase letters and numerals to convert a binary PKCS#7 certificate into a printable form.
• Binary PKCS#12: This is a format for transferring public key and private key certificates.The private key
in a PKCS #12 file is within a password-encrypted envelope. The file’s password is not connected to
your certificate’s public or private passwords. Exporting a PKCS #12 file creates this and you must
provide it to decrypt the contents when you import the file into the Zyxel Device.
Note: Be careful not to convert a binary file to text during the transfer process. It is easy for this
to occur since many programs use text files by default.
I cannot access the Zyxel Device from a computer connected to the Internet.
Check the service control rules and to-Zyxel Device security policies.
The Zyxel Device’s traffic throughput rate decreased after I started collecting traffic statistics.
Data collection may decrease the Zyxel Device’s traffic throughput rate.
I can only see newer logs. Older logs are missing.
When a log reaches the maximum number of log messages, new log messages automatically overwrite
existing log messages, starting with the oldest existing log message first.
I cannot get the firmware uploaded using the commands.
The Web Configurator is the recommended method for uploading firmware. You only need to use the
command line interface if you need to recover the firmware. See the CLI Reference Guide for how to
determine if you need to recover the firmware and how to recover it.
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