We're using the Rebex FTP/SSL component on mono (under OS/X) and the certificate verifier is throwing an exception. The exception looks like this:

Rebex.Net.TlsException: An exception occured in certificate verifier. ---> Rebex.Net.TlsException: An exception occured in certificate verifier. ---> System.DllNotFoundException: crypt32.dll
  at (wrapper managed-to-native) Rebex.Security.Cryptography.CryptoApi:CertNameToStr (uint,intptr,uint,intptr,int)
  at Rebex.Security.Certificates.DistinguishedName.ToString () [0x00000] in <filename unknown>:0 
  at Rebex.Security.Certificates.Certificate.GetSubjectName () [0x00000] in <filename unknown>:0 
  at Rebex.Net.TlsHandshake.VerifyCertificate (System.String commonName, Rebex.Security.Certificates.CertificateChain certificate) [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at Rebex.Net.TlsHandshake.VerifyCertificate (System.String commonName, Rebex.Security.Certificates.CertificateChain certificate) [0x00000] in <filename unknown>:0 
  at Rebex.Net.TlsHandshake.OnHandshakeReceivedClient (System.Byte[] buffer, Int32 offset, Int32 count, Rebex.Net.Handshake h) [0x00000] in <filename unknown>:0 
  at Rebex.Net.TlsHandshake.OnHandshakeReceived (System.Byte[] buffer, Int32 offset, Int32 count) [0x00000] in <filename unknown>:0 
  at Rebex.Net.TlsBase.ProcessHandshake (System.Byte[] buffer, Int32 offset, Int32 length) [0x00000] in <filename unknown>:0 
  at Rebex.Net.TlsBase.Process () [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at Rebex.Net.TlsBase.Process () [0x00000] in <filename unknown>:0 
  at Rebex.Net.TlsBase.Negotiate () [0x00000] in <filename unknown>:0 
  at Rebex.Net.TlsSocket.Negotiate () [0x00000] in <filename unknown>:0 
  at Rebex.Net.FtpControl.Upgrade (Rebex.Net.TlsParameters parameters) [0x00000] in <filename unknown>:0 

We've implemented our own ICertificateVerifier as per instructions received from Rebex. Everything was working in Rebex FTP 2.5.3127 but since we updated to the latest build (3.0.3484), it no longer works. In fact, it doesn't even seem to be calling our ICertificateVerifier code at all. I tried linking agains the old Rebex 2.5 build and it started working again.

The code we're using to insert the certificate verifier looks something like this:

TlsParameters tlsp = new TlsParameters();
tlsp.CertificatePolicy = TlsCertificatePolicy.RequireClientCertificate;
tlsp.CertificateVerifier = new CertificateVerifier(this);
Ftp.Secure(tlsp, FtpSecureUpgradeType.Any);

The CertificateVerifier class more or less overrides Verify() and returns TlsCertificateAcceptance.Accept.

Any insight would be appreciated.