Certificates in SAP

STRUST is tcode to setup certificates in SAP

You can setup SSL certificate for your web service and then share the certificate details with third-party , so that to establish secure connection.  - Set for everything.. Import and add to Certif list

After the certificates are set , then do a restart of ICM(smicm->admin->ICM->Restart->Yes).

And to map certificate to user id, Go to SM30 -> view VUSREXTID, type=DN -> maintain user id for certificate and tick 'Activated'.  Also check if the userid has erquired authorizations.  'Min date' - better make it blank.. we faced some issues - as sometimes certificate valid date may go beyond that, and you forget to change this.

How to automatically select SAP client certificate in Google chrome
                        
http://scn.sap.com/blogs/ivazharov/2013/10/22/how-to-automatically-select-sap-client-certificate-in-google-chrome