Before starting the SSHServerService demo you should run the SSHServer demo and set server options. For this perform the following steps after runnig the SSHServer demo:
1. Select the Security tab and make sure that the correct value is set in the "RSA key" and "DSA key" editors.
2. Select the Server tab and make sure that the correct directory is set in the "Path to keys and users" editor. Check that in this directory the RSA and DSA keys is placed.
3. Check that the SSHServerService demo has access to the "Path to keys and users" directory.