1. Click Start, and then click Run.
2. In the Open box, type regedit, and then click OK.
3. Locate, and then click the following registry key:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\CertSvc\Configuration\
4. In the right pane, double-click ValidityPeriod.
5. In the Value data box, type one of the following, and then click OK:
Days
Weeks
Months
Years
6. In the right pane, double-click ValidityPeriodUnits.
7. In the Value data box, type the numeric value that you want, and then click OK. For example, type 2.
8. Stop, and then restart the Certificate Services service. To do so:
a. Click Start, and then click Run.
b. In the Open box, type cmd, and then click OK.
c. At the command prompt, type the following lines. Press ENTER after each line.
net stop certsvc
net start certsvc
d. Type exit to quit Command Prompt.
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