In an opened KeyStore window, select the key pair entry and click on
the right mouse button. From the popup menu select
Extend Validity. A new expiration date
must be selected. This functionality makes sense only for the Key Pairs
containing only a self signed certificate.
A screenshot for extend certificate's validity action can be seen below:
As it can be seen in the screenshot, the user can also set a new
serial number for the new resulting certificate. The serial number can be
generated randomly by using the
Generate button, or the user
can set a certain serial number by typing it in the text box. The new
serial number has to be a pozitive integer value. Otherwise, a red message
will be displayed under the text box informing that the new serial number
is invalid and the operation will not continue.