Hi i am trying to install the certificate.p12 file in Keychain Access's Login section on my mac mini. For each .p12 file it showing "This certificate was signed by an unknown authority". But when i tried to install the same .p12 file on other machine, its got install and showing "This is a valid certificate" Before installing this .p12 file, i was able to install the .p12 file. But to install the new .p12 file, i had deleted all the .p12 files and provisioning profiles. After that i was not able to install any .p12 file on my machine. Can anybody help me on this?