You need:
To have already bought an SSL certificate.
To have generated a CSR and a private key.
Wait for the Certification Authority to validate your CSR.
Once it is validated, you can download it from your HTTPCS dashboard.
1. In ASDM, click on « Configuration » → « Device Management ».
2. Click on « Certificate Management » → « CA Certificate ».
3. Click on « Add ».
4. Click on « Browse » and specify the path to the intermediate certificate you've just downloaded from your HTTPCS dashboard.
5. Click on « Install Certificate ».
A dialog box should appear to confirm the installation was successful.
6. Go back to the ASDM and click on « Configuration » → « Device Management ».
7. Click on « Certificate Management » → « Identity Certificates » and indicate the path to the certificate you've downloaded from your HTTPCS dashboard.
A dialog box should show up to confirm the installation was successful.
8. Go back to ASDM then click on « Configuration » → « Device Management ».
9. Expand « Advanced » and select « SSL Settings ».
10. Under « Certificates » select the interface you want to secure, then click on « Edit ».
11. In the drop-down list, choose the certificate you've just installed and click on « OK ».
12. Click on « Apply ». Your certificate should now be activated.
13. To check that your SSL is indeed installed, use our SSL checker.