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SNMP v3 and Cacti

Software Effect Enterprises, Inc Posted on June 13, 2017 by SEEIMay 14, 2022

A quick synopsis on setting up a Cisco ASA and a Centos 6 or 7 system to use SNMP v3 to be monitored by Cacti Cisco ASA en conf t # create a snmp-server group (needed for SNMP v3) # … Continue reading →

Posted in Cacti, Centos, Centos 6, Centos 7, Cisco ASA, Juniper, Linux, SNMP, SRX | Tagged asa, cacti, juniper, linux, snmp, SRX

Change port for sshd server

Software Effect Enterprises, Inc Posted on November 11, 2015 by SEEIJanuary 20, 2021

I changed the port for sshd on my servers to reduce the number of attacks against the sshd server. In the following example, I am changing the port from the default of 22 to 43231 First – backup your sshd_config … Continue reading →

Posted in Centos, Centos 6, Centos 7

DRBD on Centos

Software Effect Enterprises, Inc Posted on March 26, 2017 by SEEIDecember 30, 2020

Installation Centos 7 rpm –import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-2.el7.elrepo.noarch.rpm yum -y install drbd84-utils kmod-drbd84 Centos 6 rpm –import http://elrepo.org/RPM-GPG-KEY-elrepo.org rpm -Uvh http://elrepo.org/elrepo-release-6-5.el6.elrepo.noarch.rpm rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm rpm –import ‘http://keys.gnupg.net:11371/pks/lookup?search=0x0608B895&op=get’ yum -y install drbd84-utils kmod-drbd84 Configuration create /etc/drbd.d/drbd1.res resource repdata { protocol … Continue reading →

Posted in Centos, Centos 6, Centos 7

Could not apply stored configuration to monitors

Software Effect Enterprises, Inc Posted on December 6, 2020 by SEEIDecember 6, 2020

You log onto your linux system and you get the message “Could not apply the sotred configuration to monitors” Start a bash prompt cd ~/.config mv monitors.xml monitors.xml.zzz Log off and log back on again  

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Posted in Centos, Centos 6, Centos 7, Centos 8, Fedora, Mate | Tagged apply, centos, configuragtion, fedora, monitors, redhat

RDesktop on Centos

Software Effect Enterprises, Inc Posted on November 9, 2015 by SEEIAugust 10, 2020

Centos 7 yum -y install epel-release yum -y groupinstall “GNOME Desktop” yum -y install xrdp xorg-x11-xinit firewall-cmd –permanent –zone=public –add-port=3389/tcp firewall-cmd –reload systemctl start xrdp.service systemctl enable xrdp.service Centos 6 rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm wget -O epel6.key.txt ‘http://keys.gnupg.net:11371/pks/lookup?search=0x0608B895&op=get’ rpm –import epel6.key.txt … Continue reading →

Posted in Centos, Centos 6, Centos 7

Move a virtual machine from one Centos machine to another

Software Effect Enterprises, Inc Posted on August 27, 2015 by SEEIJuly 25, 2020

Revised: How to migrate a kvm guest from one host to another. These instructions are for moving a guest machine from one host to another host where the storage is on the host (instead of external storage that can be … Continue reading →

Posted in Centos 6, Centos 7, Libvirt

SSH WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!

Software Effect Enterprises, Inc Posted on December 22, 2019 by SEEIJanuary 3, 2020

You go to ssh to a system and you get the following message @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ WARNING: POSSIBLE DNS SPOOFING DETECTED! @ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ The ECDSA host key for server.domain.com has changed, and the key for the corresponding IP address 10.128.15.2 is … Continue reading →

Posted in Centos, Centos 6, Centos 7, ssh | Tagged host, remote, ssh

Web Site Certificate/SSL Tests

Software Effect Enterprises, Inc Posted on May 13, 2016 by SEEIJune 16, 2019

I have found the following two sites helpful in finding issues with the configuration of SSL secured web sites https://ssltools.digicert.com/checker/ https://www.ssllabs.com/ssltest/analyze.html Test which ciphers (TLS, SSL, etc) are enabled nmap -sV –script ssl-enum-ciphers -p 443 www.yourdomain.com Ref: https://nmap.org/nsedoc/scripts/ssl-enum-ciphers.html

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Posted in Centos 6, Centos 7, Cisco ASA, Linux, Windows, Zimbra

ssh fails to connect with debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

Software Effect Enterprises, Inc Posted on November 11, 2018 by SEEINovember 11, 2018

Running ssh across a vpn connection I started having my ssh sessions fail to connect. After starting ssh with the “-vvv” option, the session would timeout after getting a debug1: expecting SSH2_MSG_KEX_ECDH_REPLY After doing some research, I found other people … Continue reading →

Posted in Centos, Centos 6, Centos 7, Cisco ASA, Linux, ssh

Custom logon prompt for getty

Software Effect Enterprises, Inc Posted on August 1, 2017 by SEEIJuly 16, 2018

Fix your logon prompt for when you are on the console of your Linux server (Centos 6 runlevel 3 or Centos 7 multi-user.target) so that it displays your current ip address Edit /etc/rc.d/rc.local and add the following lines to the end … Continue reading →

Posted in Centos 6, Centos 7

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