You may experience 'Invalid Key Size' error when connecting to your server. This bug is addressed in the ComponentSoft version (2011.2 - v5.0) that we are working on. To go through this error in the current version 2011.1 - v3.5, you can set AllowedMacAlgorithms and/or AllowedHostKeyAlgorithms. The following examples demonstrate how to set them:

Setting AllowedMacAlgorithms

Sftp s = new Sftp(); s.AllowedMacAlgorithms = SshMacAlgorithm.MD5;

Setting AllowedHostKeyAlgorithms

Sftp s = new Sftp(); s.AllowedHostKeyAlgorithms = SshHostKeyAlgorithm.Rsa;

If you still experience the error, please send us your log file and we will investigate it.