in NotificationConnection when you try to load the certificate file (whether with or without password) the process fails. the reason: not all the contractors are implemented there.

instead of using: certificate = new X509Certificate2(p12File);

you can use this: certificate = new X509Certificate2(System.IO.File.ReadAllBytes(p12File));

the contractor of X509Certificate2 that receives byte array of the file data exists. this solution will be good both for windows and mono..

this was checked on mono 2.6.1

Fixed via your suggestion. Thanks!