SessionOptions sessionOptions = new SessionOptions
{
    Protocol = Protocol.Sftp,
    HostName = "11.22.33.44",
    PortNumber = 2222, /* This is cause of the issue i was facing*/
    UserName = "abcdef",
    Password = "ghijklmnop",
    SshHostKeyFingerprint = "ssh-rsa 2048 aa:bb:cc:dd:ee:ff:gg:hh:ii:jj:kk:ll:mm:nn:oo:pp"
};