02-27-2006
There are a couple of things you can look at - it matters what your servers are using and how they are set up.
You can either look into changing on server B your /etc/hosts.allow and/or /etc/hosts.deny files (if you are using tcp wrappers), OR, you can shutdown the rsh services in /etc/inetd.conf. See the man page for inetd.conf and inetd.
You can also look to see if /etc/hosts.equiv exist - it may be granting the access there.
Before changing anything - you need to understand what it may do to something that IS okay between these servers (maybe remote copy is needed so turning off all rsh services would not be the way to go).
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TCPDCHK(8) System Manager's Manual TCPDCHK(8)
NAME
tcpdchk - tcp wrapper configuration checker
SYNOPSIS
tcpdchk [-a] [-d] [-i inet_conf] [-v]
DESCRIPTION
tcpdchk examines your tcp wrapper configuration and reports all potential and real problems it can find. The program examines the tcpd
access control files (by default, these are /etc/hosts.allow and /etc/hosts.deny), and compares the entries in these files against entries
in the inetd or tlid network configuration files.
tcpdchk reports problems such as non-existent pathnames; services that appear in tcpd access control rules, but are not controlled by tcpd;
services that should not be wrapped; non-existent host names or non-internet address forms; occurrences of host aliases instead of official
host names; hosts with a name/address conflict; inappropriate use of wildcard patterns; inappropriate use of NIS netgroups or references to
non-existent NIS netgroups; references to non-existent options; invalid arguments to options; and so on.
Where possible, tcpdchk provides a helpful suggestion to fix the problem.
OPTIONS
-a Report access control rules that permit access without an explicit ALLOW keyword. This applies only when the extended access control
language is enabled (build with -DPROCESS_OPTIONS).
-d Examine hosts.allow and hosts.deny files in the current directory instead of the default ones.
-i inet_conf
Specify this option when tcpdchk is unable to find your inetd.conf or tlid.conf network configuration file, or when you suspect that
the program uses the wrong one.
-v Display the contents of each access control rule. Daemon lists, client lists, shell commands and options are shown in a pretty-
printed format; this makes it easier for you to spot any discrepancies between what you want and what the program understands.
FILES
The default locations of the tcpd access control tables are:
/etc/hosts.allow
/etc/hosts.deny
SEE ALSO
tcpdmatch(8), explain what tcpd would do in specific cases.
hosts_access(5), format of the tcpd access control tables.
hosts_options(5), format of the language extensions.
inetd.conf(5), format of the inetd control file.
tlid.conf(5), format of the tlid control file.
AUTHORS
Wietse Venema (wietse@wzv.win.tue.nl),
Department of Mathematics and Computing Science,
Eindhoven University of Technology
Den Dolech 2, P.O. Box 513,
5600 MB Eindhoven, The Netherlands
TCPDCHK(8)