1. Click on the Lync Server Deployment Wizard icon on Start screen (Windows Server 2012 version) to launch the wizard screen for deployment wizard.
2. Click on Install or Update Lync Server System.
3. Click run button on Step3. Request, Install or Assign Certificates to launch the Certificate Wizard Screen.
4. Click on Request button to start CSR creation process.
5. Click Next to continue.
6. Select Prepare the request now, but send it later (offline certificate request)
7. Click on Browse button for location to save or type on the box the location and filename for the CSR file name.
8. Click Next on this screen since the template is not necessary for Public Trust CA.
9. On this screen please type your Friendly Name and make sure the bit length is 2048 and check the box for Mark certificate’s private key as exportable. PLEASE BE NOTED, if this checkbox is not being checked during CSR creation process, then the function to export the cert with private key from this server will be disabled and this particular cert cannot be assigned for global token issuer (OAuthTokenIssuer).
10. Type in your Organization, Organization Unit, Country, State, City and State.
11. On this screen you will be presented with the Subject Name (CN) and SANS that listed for your server.
12. If your server has been setup with SIP functionality then you might need to check the box for the domain listed on Configured SIP domains box.
13. OPTIONAL: If you have any other SAN that you need to add then you can type on this box otherwise you can click next button to continue.
14. Click Next button to continue for the screens below.
15. Click Finish button on this screen to end the process for CSR creation,
16. The correct CSR should be looking like the screen shot below.
17. Open CSR file with Notepad or Wordpad, copy all and paste into this tool can test CSR is valid and accurate or not: https://cryptoreport.websecurity.symantec.com/checker/views/csrCheck.jsp
18. Copy the entries of CSR file and send it to VietNamHost , or paste it to the online SSL order screen on VietNamHost website.
19. After you receive your SSL Certificate from VietNamHost, you can install it.
See Microsoft Lync 2013 SSL Installation Instructions.
