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Operating Systems Solaris after patch, telnet not working Post 60274 by antalexi on Thursday 13th of January 2005 07:04:52 PM
Old 01-13-2005
after patch, telnet not working

The problem:
I installed the Solaris 8 recommended patch cluster 117350-11 over 108528-15 before the Christmas break. The server is a SunFire V100. Here is the situation:

Before the patch install, there was a working cron job that did daily, weekly, and monthly backups of the V100 filesystems over the network to a tape device.
Here is a extract from the log file when it worked BEFORE:

Dumping /dev/rdsk/c0t2d0s0 (apples:/) to oranges:/dev/rmt/5mn

After the patch install, here is a extract of the same log:

DUMP: NEEDS ATTENTION: Cannot open `oranges:/dev/rmt/5mn'. Do you want to retry the open?: ("yes" or "no") DUMP: The ENTIRE dump is aborted.

I found out that telnet from apples to oranges DOES NOT work. When I type "telnet oranges", the "Trying 123.45.67.89" message is displayed, but no connection is established.

When I telnet from oranges to apples, it works.

What I checked:

Here is the netstat -nr info on the patched system apples:

Routing Table: IPv4
Destination Gateway Flags Ref Use Interface
-------------------- -------------------- ----- ----- ------ ---------
123.45.253.72 123.45.253.74 (apples) U 1 2261 dmfe0
224.0.0.0 123.45.253.74 (apples) U 1 0 dmfe0
default 123.45.253.73 (peach) UG 1 16613

/etc/defaultrouter 123.45.253.73

Here is the netstat -nr info from oranges (Ultra 1):

Routing Table: IPv4
Destination Gateway Flags Ref Use Interface
-------------------- -------------------- ----- ----- ------ ---------
123.45.94.0 123.45.94.36 (oranges) U 1 12322 le0
224.0.0.0 123.45.94.36 (oranges) U 1 0 le0
default 134.51.94.1 (grapes) UG 1 17538

/etc/defaultrouter 134.51.94.1

I don't have /etc/hosts.deny or /etc/hosts.allow in either apples or oranges. I do have a /etc/hosts.equiv on oranges, which has the apples host in it:

/etc/hosts.equiv apples

but no /etc/hosts.equiv file in apples.

I searched the forums, but couldn't find any posts where a patch caused telnet to stop working.

So, the BIG question is:

Why does telnet work one-way, but not the other way?

Let me know if you need any other info.

Thanks Smilie

Last edited by antalexi; 01-13-2005 at 08:13 PM..
 

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XRLOGIN(1)						      General Commands Manual							XRLOGIN(1)

NAME
xrlogin - start an xterm that uses ssh (or optionally rlogin or telnet) to connect to a remote host SYNOPSIS
xrlogin [-l username] [-rlogin|-telnet] [xterm options] remote-host DESCRIPTION
Xrlogin opens an xterm window and runs ssh, rlogin or telnet to login to a remote host. Xrlogin automatically passes the -name argument to xterm with a value of "xterm-hostname" where hostname is the name of the remote host. This allows the user to specify resources in their server's resource manager which are specific to xterms from a given host. For example, this feature can be used to make all xterm windows to a given remote host be the same color or use a specific font or start up in a spe- cific place on the screen. Xrsh(1) passes the same string so they are compatible in this regard. Xrlogin specifies that the default title for the new xterm will be "hostname" where hostname is the name of the remote host. This and the -name argument above can be overridden with xterm-options on the command line. One could also use xrlogin's sister command xrsh(1) to open a window to a remote host. In the case of xrsh, the xterm would run on the remote host and use X as the connection protocol while xrlogin would run the xterm on the local host and use rlogin or telnet as the con- nection protocol. See xrsh(1) for a discussion of the merits of each scheme. OPTIONS
-l username When not using -telnet, use username as the id to login to the remote host. -rlogin Use the rlogin protocol to open the connection. In general rlogin is preferred because it can be configured to not prompt the user for a password. Rlogin also automatically propagates window size change signals (SIGWINCH) to the remote host so that applications running there will learn of a new window size. -telnet Use the -telnet protocol to open the connection. Use of telnet provided mostly for hosts that don't support rlogin. COMMON PROBLEMS
Make sure that the local host is specified in the .rhosts file on the remote host or in the remote hosts /etc/hosts.equiv file. See rlogin(1) for more information. EXAMPLES
xrlogin -bg red yoda Start a local red xterm which connects to the remote host yoda using rlogin. xrlogin -telnet c70 Open a local xterm which connects to the remote host c70 using telnet. SEE ALSO
xrsh(1), rlogin(1), telnet(1) AUTHOR
James J. Dempsey <jjd@jjd.com> and Stephen Gildea <gildea@intouchsys.com>. X Version 11 Release 6 XRLOGIN(1)
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