Sponsored Content
Operating Systems Solaris Change from weak ssh host key to strong one Post 303036682 by rbatte1 on Monday 8th of July 2019 05:35:10 AM
Old 07-08-2019
Just came across this. One thing to be aware of is that all clients will object when you next try to connect them. They will alert on there being a possible man-in-the-middle attack or a DNS attack that is trying to send you to a different host (as determined by the keys) so you would need to get each client to forget the server keys for the machine(s) you are replacing the keys on and re-validate them all, or manually replace the old key with the new on all the clients.

You need to consider all the names that the clients could refer to the server as, be that IP, local hosts, DNS short name, fully qualified DNS name, DNS alias etc. and look for those in ~/.ssh/known_hosts

You will need to do this for every account on every client, so it is not a thing to be done lightly, especially if there are multiple automated jobs that connect with SSH, SCP, SFTP etc. that you need to ensure are not disrupted.


Sorry if I've made you panic, but better that than a massive failure.



I hope that this helps,
Robin
 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

change user> to user@host> ssh prompt

Hi, I was wondering how to change the prompt for my ssh login. At the moment it is like user> while I'd like it to be as user@host> It is in the .bash_profile or .ssh ??? Thanks (2 Replies)
Discussion started by: pmasterkim
2 Replies

2. UNIX for Advanced & Expert Users

RSA host key addition

Guys How do i add RSA key for a host ? I was able to connect to a host some time back but now its not connectable ,via SSH. Message i get is : abhi@myHost:~/.ssh> ssh eatcid@yourHost @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION... (3 Replies)
Discussion started by: ak835
3 Replies

3. Shell Programming and Scripting

Using ssh to add register key on ssh server

Hi, I want to use ssh to add a register key on remote ssh server. Since there are space characters in my register key string, it always failed. If there is no space characters in the string, it worked fine. The following is what I have tried. It seems that "ssh" command doesn't care about double... (9 Replies)
Discussion started by: leaftree
9 Replies

4. UNIX for Advanced & Expert Users

Help! How to find the local host after few ssh hops to remote host???

I do a ssh to remote host(A1) from local host(L1). I then ssh to another remote(A2) from A1. When I do a who -m from A2, I see the "connected from" as "A1". => who -m userid pts/2 2010-03-27 08:47 (A1) I want to identify who is the local host who initiated the connection to... (3 Replies)
Discussion started by: gomes1333
3 Replies

5. Shell Programming and Scripting

Host Key verification failed

Hi, I am running a script to scp a file from one server to another. I have created the public/private key and copied the public key to the other server and appended it to authorized_key file. But i am getting the error message saying "Host Key verification failed" Connection lost. It works well... (3 Replies)
Discussion started by: ahamed
3 Replies

6. UNIX for Dummies Questions & Answers

host key issue via java

Hi, I am encountering below mentioned exception when I execute my Java program that is supposed to SFTP the file from one server over to another. Can you please tell me some pointers to resolve this issue? Exception HostName- 10.1.1.1 ; userName- bmsftp log4j:WARN No appenders could be... (0 Replies)
Discussion started by: prashant.ladha
0 Replies

7. Solaris

Solaris 8 ssh public key authentication issue - Server refused our key

Hi, I've used the following way to set ssh public key authentication and it is working fine on Solaris 10, RedHat Linux and SuSE Linux servers without any problem. But I got error 'Server refused our key' on Solaris 8 system. Solaris 8 uses SSH2 too. Why? Please help. Thanks. ... (1 Reply)
Discussion started by: aixlover
1 Replies

8. Solaris

Ssh between servers - No DSA host key is known

It seems I can do ssh <IP> but not ssh <hostname> If I try to ssh to hostname I get the error - No DSA host key is known for host1 and you have requested strict checking. Host key verification failed. Where do I set up the DSA keys? Is it ssh_known_hosts? Assume afterwards I can... (3 Replies)
Discussion started by: psychocandy
3 Replies

9. UNIX for Beginners Questions & Answers

Host key verification failed error

HI i am getting host key verification failed error. # cat id_rsa.pub | ssh root@10.110.51.245 'cat >> .ssh/authorized_keys;exit;' cat: id_rsa.pub: No such file or directory @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! ... (3 Replies)
Discussion started by: scriptor
3 Replies

10. Forum Support Area for Unregistered Users & Account Problems

Password sent via reset password email is 'weak' and won't allow me to change my password

I was unable to login and so used the "Forgotten Password' process. I was sent a NEWLY-PROVIDED password and a link through which my password could be changed. The NEWLY-PROVIDED password allowed me to login. Following the provided link I attempted to update my password to one of my own... (1 Reply)
Discussion started by: Rich Marton
1 Replies
gkrellmd(1)							   User's Manual						       gkrellmd(1)

NAME
gkrellmd - The GNU Krell Monitors Server SYNOPSIS
gkrellmd [ --help ] [ --verbose ] [ -u | --update-hz N ] [ -m | --max-clients N ] [ -P | --port N ] [ -a | --allow-host hostname ] DESCRIPTION
gkrellmd Listens for connections from gkrellm clients. When a gkrellm client connects to a gkrellmd server all builtin monitors collect their data from the server. However, the gkrellm process is running on the local machine, so any enabled plugins will run in the local context (Flynn is an example exception to this since it derives its data from the builtin CPU monitor). Also, any command launching will run commands on the local machine. There is no support for file system mounting and local mailbox checking on the machine where the gkrellmd server is running. OPTIONS
-h --help Displays usage information and exits. -v --version Prints gkrellmd version and exits. -V --verbose Prints connection progress. -u, --update-hz f Sets the data update frequency in samples per second for the server. This is independent of and should be less than the gkrellm client update rate. The rate can be from 1 to 10 and should be lower to minimize network traffic. A value of not much more than 1/2 the client update rate is best where it is not important to minimize network traffic. -m, --max-clients N Sets the maximum number of simultaneous clients allowed to connect to the server. -P, --port server_port Use server_port for the network connection. -a, --allow-host hostname Specify hosts which are allowed to connect. Multiple allow-host arguments may be given. If no hosts are specified on the command line or in a gkrellmd.conf file, then all hosts are allowed to connect. Also, if hostname is the keyword ALL then all hosts are allowed. This option is additive and specified hosts will be added to the hostnames listed in gkrellmd.conf files unless the --clear-hosts option is given first. -c, --clear-hosts Clears the current list of allowed hosts. Use this before any --allow-host arguments if you want command line allowed hosts to override and not be additive to those specified in gkrellmd.conf files. FILES
/etc/gkrellmd.conf System server config which is read first. The config file may contain lines similar to the command line args. For example: allow-host localhost allow-host 127.0.0.1 port 19150 max-clients 2 update-hz 2 /usr/local/etc/gkrellmd.conf Local server config file which is read second. ~/.gkrellmd.conf User server config file which is read last. With the exception of --allow-hosts, command line args will override options in gkrellmd.conf files. AUTHOR
Bill Wilson <bill@gkrellm.net>. http://www.gkrellm.net/ GNU
/Linux July 24, 2002 gkrellmd(1)
All times are GMT -4. The time now is 01:11 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy