ZyXEL Communications ZyWALL 110 Handbook page 291

Select Place all certificates in the following store and then click Browse and find
Trusted Root Certification Authorities. Click Next, then click Finish.
Note: Each ZyWALL/USG device has its own self-signed certificate by factory default.
When you reset to default configuration file, the original self-signed certificate is erased,
and a new self-signed certificate will be created when the ZyWALL/USG boots the next
time.
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