I have a MAC user (using the MAC ICA OSX client) that is unable to launch apps in Citrix. He keeps getting the message "You have not chosen to trust "Verisign Class 3 Secure Server CA," the issuer of the server's security certificate. Error number 183" He has the Verisign Class 3 Sercure Server CA.cer file. I had him rename the file with a .crt extension and place it in the Applications:Citrix ICA Client:keystore:cacerts folder on his MAC, and Always to trust the certificate. He continues to get the "You have not chosen to trust "Verisign Class 3 Secure Server CA," the issuer of the server's security certificate. Error number 183" error message. Any help would be greatly appreciated. Thanks, Cathy