HP-UX HB v13.00 Ch-10 - Network Services

HP-UX Handbook – Rev 13.00 Page 18 (of 26)
Chapter 10 Network Services
October 29, 2013
If the automountd process no longer responds to the SIGUSR2 signal, it most often will also not
respond to the SIGTERM signal. In this case, there is no other way to fully restore the
functionality of the daemon than to reboot.
Commonly used network services
telnet
The telnet service has historically been the application that provides a pseudo-term (which is a
substitute for a hard-wired console interface) for a login account to use to access a server. This
service is quickly being replaced by ssh because of the lack of security with telnet. The telnet
user is given only a cursory inspection of its identity (forward and reverse lookup of incoming IP
address to prevent spoofing) and it provides no privacy since everything, including, the clear
text password can be picked up with a network trace.
It is launched via the inetd process and is configured via /etc/inetd.conf
telnet stream tcp6 nowait root /usr/lbin/telnetd telnetd
Telnet is well-known service:
telnet 23/tcp # Virtual Terminal Protocol
Common problems include:
 Connection refused – Usually there is no inetd running to accept the connection request
 telnet: Unable to connect to the remote host: Connection timed out – Usually the telnet
request is not reaching the destination telnet server. Could be routing or the address does
not really exist.
 Long pause between supplying account name at login: prompt and being prompted for
Password: - This is a hostname resolution issue on the telnetd server of getting a name
service response back. Check for forward and reverse resolution of the telnet client’s
hostname and IP address.
 Long pause after providing a password and getting a command prompt – Likely an issue
of large or corrupt utmp file or something wrong in the login user’s profile.