The "Disconnected; Authentication Error (No further authentication methods available.)" message indicates that none of the methods that have been used to authenticate you to the server have been successful.
A relatively common situation is one where the remote host computer is expecting public-key authentication to be used and you have not sent your public key to the host. You can do this by following the instructions in Section Uploading Your Public Key.
This error is also produced if the system's name server is not doing reverse lookups correctly. Ask your system administrator to configure the name server to do reverse lookups properly.
If this is not possible, the system administrator has to edit the file /etc/ssh2/sshd2_config on the Secure Shell server and change the RequireReverseMapping setting to no.
This is a common problem for modem connections. Typical modem connections use dynamic IP addresses. This means that the IP address changes from one connection to another, and these dynamic IP addresses have no permanent name server entries in the Domain Name System (DNS). If this is the case, you will have to ask your service provider to edit the sshd2_config file on the Secure Shell server.