01-14-2007
Probably not. It will depend to some extent on how you resolve hostnames. If you resolve locally, or the DNS server has not been updated, then telnet will still work, even if the host name has changed.
I don't think you will have a problem though, unless the system does not complete a normal reboot. Even then (if you have a hang or crash) you will probably get away with it.
I presume you didn't down or detach any ethernet interfaces, so the change never went into effect and the next time the system boots it will re-read the original hostname, so all should be OK.
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UNAME(1) BSD General Commands Manual UNAME(1)
NAME
uname -- Print operating system name
SYNOPSIS
uname [-amnprsv]
DESCRIPTION
The uname utility writes symbols representing one or more system characteristics to the standard output.
The following options are available:
-a Behave as though all of the options -mnrsv were specified.
-m print the machine hardware name.
-n print the nodename (the nodename may be a name that the system is known by to a communications network).
-p print the machine processor architecture name.
-r print the operating system release.
-s print the operating system name.
-v print the operating system version.
If no options are specified, uname prints the operating system name as if the -s option had been specified.
SEE ALSO
hostname(1), machine(1), sw_vers(1), uname(3)
STANDARDS
The uname utility conforms to IEEE Std 1003.2-1992 (``POSIX.2''). The -p option is an extension to the standard.
BSD
November 9, 1998 BSD