Networking Guide
Chapter 10, Configuring the Serial Line Internet Protocol (SLIP)

Troubleshooting rlogin and telnet problems

Troubleshooting rlogin and telnet problems

If ping works correctly but rlogin(TC) or telnet(TC) fails, consult the appropriate manual page to make sure that your command syntax is correct. If the syntax is correct, verify that your /etc/hosts file has an entry for the target host.

The following telnet or rlogin error message indicates either that there are no more pseudo-ttys available to make additional connections or that the terminal database does not contain entries for the /dev/ttyp?? the system is attempting to use: 

   Cannot obtain database information on this terminal.
   Connection closed.
For information on gaining access to additional pseudo-ttys, see ``Adding or removing pseudo-ttys''.