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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

Show available wifi networks

Software Effect Enterprises, Inc Posted on November 18, 2019 by SEEINovember 18, 2019

nmcli dev wifi nmcli -f ALL dev wifi For more information see here

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Posted in Centos, Centos 7, Centos 8 | Tagged network, wifi

Edit Transport Maps On Postfix

Software Effect Enterprises, Inc Posted on May 8, 2015 by SEEIMarch 7, 2019

If you need email delivered to a specific server for selected domains you do the following: As root, edit the /etc/postfix/main.cf. Find (or add) the line that starts with transport_maps= If it does not exist, add the line “transport_maps=hash:/etc/postfix/transport. If … Continue reading →

Posted in Centos, Fedora, Linux

IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!

Software Effect Enterprises, Inc Posted on December 8, 2018 by SEEIDecember 8, 2018

You get the above message when running ssh. The issue is, you have connected to this host/ip in the past and the machine you are connecting to has been replaced and/or lots of updates have been done to it. If … Continue reading →

Posted in Centos, ssh

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

Limit access to web site with a combination of IP address and basic authentication

Software Effect Enterprises, Inc Posted on May 24, 2017 by SEEIMay 24, 2017

I have a web site that I need to limit access with a combination if username/password AND ip address running on Apache 2.4 I completed this by putting the following in a configuration file <VirtualHost mystuff.domain.com:80> <Directory  /opt/mystuff>     Options … Continue reading →

Posted in Apache, Apache 2.4, Centos, Centos 7

Generate a new UUID for ethernet interface

Software Effect Enterprises, Inc Posted on May 12, 2017 by SEEIMay 12, 2017

# uuidgen ifcfg-eth0 e62680c3-f5f5-4f06-b862-68e00e3b4506

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Posted in Centos, Centos 6, Centos 7

3 command-line file conversion tools for Linux

Software Effect Enterprises, Inc Posted on October 20, 2016 by SEEIOctober 20, 2016

Pandoc Everyone I know who works with markup languages says Pandoc is the go-to utility for converting between those languages. And for good reason: Pandoc not only does some pretty nifty conversions, it’s fast, too. Have a file formatted with … Continue reading →

Posted in Centos, Fedora, Linux

Using UUID to Mount Disk

Software Effect Enterprises, Inc Posted on July 5, 2016 by SEEIJuly 5, 2016

In linux, hard drive dev assignments can get changed between reboots – especially with external/removable drives. This means using /dev/sdX or /dev/hdX is not the best way to mount a drive that needs to be mounted every time at boot. … Continue reading →

Posted in Centos, Centos 6, Centos 7, Fedora, Linux

Security Wipe Of Hard Drive Using Linux

Software Effect Enterprises, Inc Posted on December 4, 2015 by SEEIDecember 4, 2015

first – determine the dev of the hard drive – as in /dev/sda /dev/sdb etc Then excute shred -vz -n 3 /dev/XXX where XXX is the identifier of the hard drive Increase 3 to a larger value for higher security … Continue reading →

Posted in Centos, Centos 6, Centos 7, Fedora, Linux

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