Issue with "rsh" on RedHat

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# 1  
Issue with "rsh" on RedHat

Hi Folks,

I feel that I should be posting this in the Unix for Dummies Forum and will probably wish I'd created an account and done just that - but here goes anyway.

I have two identical servers both Dell R430's both running RedHat Enterprise Server 7.4 and the same kernel, both have the same network config although they are located at different sites - all good so far!

During the setup of the servers we run a script which has the following command line entry;

rsh -l autoupd mkdir -p /var/dr/uploads/${hostname}

On one host this works fine on the other host the script hangs at this point!

So to test I did the following on the two hosts;
Host 1 - the one that works!
[root@fbasphmsip1 autodoc]# uname -a
Linux fbasphmsip1 3.10.0-693.el7.x86_64 #1 SMP Thu Jul 6 19:56:57 EDT 2017 x86_64 x86_64 x86_64 GNU/Linux
[root@fbasphmsip1 autodoc]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.4 (Maipo)
[root@fbasphmsip1 autodoc]# rsh -l autoupd uname -s
[root@fbasphmsip1 autodoc]# rsh -l autoupd uname -a
SunOS isd250 5.10 Generic_150400-46 sun4v sparc sun4v
[root@fbasphmsip1 autodoc]#

Host 2 - the one that doesn't work!
[root@fbakirmsir1 autodoc]# uname -a
Linux fbakirmsir1 3.10.0-693.el7.x86_64 #1 SMP Thu Jul 6 19:56:57 EDT 2017 x86_64 x86_64 x86_64 GNU/Linux
[root@fbakirmsir1 autodoc]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.4 (Maipo)
[root@fbakirmsir1 autodoc]# rsh -l autoupd uname -s
[root@fbakirmsir1 autodoc]#

It all hangs and you have to "ctrl C" to break out, but by doing;
[root@fbakirmsir1 autodoc]#  rsh -l autoupd
Last login: Thu Jan 10 14:20:32 from fbakirmsir1
$ uname -s
$ uname -a
SunOS isd250 5.10 Generic_150400-46 sun4v sparc sun4v
$ exit
rlogin: connection closed.
[root@fbakirmsir1 autodoc]#

Any one want to hazzard a guess?


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# 2  
Hmmm - difficult to say - any differences in the config files?

Last edited by RudiC; 01-10-2019 at 11:41 AM.. Reason: typo
# 3  
Hi Rudi,

There's nothing configured at either end, there is a .rhosts on the target server - the problem has to lie with the second server as I have just shy of 1800 unix servers of various flavours all working. This is the only one not working, I'm completely flummoxed having spent a couple of hours looking at it now.


This User Gave Thanks to gull04 For This Post:
# 4  
You say "different sites". Are you using a VPN? What about routing? Firewall? Not too probable, as interactive access seems to work, but...?
# 5  
Hi Rudi,

I've been through the routing that is all OK.

I've checked that the ports are open and that they are available all the way between the site - I have several hundred servers on each of the two sites and they are all working.

Just confused at the moment, going to have a think about this and will return to it later on.


# 6  
Does your RedHat server config have these rsh-related config files:
  • /etc/xinetd.d/rsh
  • /etc/securetty
  • ~/.rhosts
  • /etc/pam.d/rsh

If so, please cat and compare them, if you have not already.


Did you check the log files, for example:
  • /var/log/messages

Normally, the log files have a lot of clues Smilie
# 7  
Back from a run, pondering on your problem - following ideas, most of which you certainly have already handled / eliminated:
- use another protocol (on my system, rsh in fact is ssh)?
- extended logging possible?
- idiosyncrasies with non-interactive login?
- (hidden) reading from stdin?
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