How do I disable external logins?
How do I disable external telnet?
Can I lock access to the admin http port to internal addresses only?

This is all done with the admin disable feature. It basically disables any http, telnet, or snmp access to the WAN side of the Cayman for administration.

This setting is located in:
Browse into unit->click on dslwanport->vcc1 configuration->restrictions-> select admin disable->save->restart the Cayman

How do I change the passwords for the default accounts?

Browse into unit->click on expert mode->passwords

manual
Cayman Systems, Inc
296 Concord Rd
Billerica, MA 01821d
Email: support@cayman.com
Phone: 978-262-5170
Fax: 978-667-4404
http://www.cayman.com