I am trying to send push notification to iphone. By searching on internet i found that register the P12 file on server with winhttpcertcfg. But when I tried with this command winhttpcertcfg -g -c LOCAL_MACHINE\MY -s "CertificateName" -a "ASPNET" on command window after installing winhttpcertcfg. But I am getting the error "Unable to find or obtain a context for request certificate" Can you please suggest me, how to solve this error?