Cisco AnyConnect on Centos 7
I had to install AnyConnect 3 on my Centos machine (yes, I know, it is long past end of life – but sometimes you have to take one step back to take two steps forward) and when I launched it … Continue reading →
Category Archives: Centos 7
Web Site Certificate/SSL Tests
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
Continue reading →Change timezone in Centos 7
You set up a machine – but you set the wrong timezone, how to fix it? First confirm the current timezone [root@mysystem ~]# date Mon Jun 3 09:08:58 CDT 2019 We will use the tool timedatect to change it. Now … Continue reading →
See what is going on as your Centos 7 system boots
I have had some problems with kernels, modules, drivers, services, etc causing Centos to lock up when the system boots. This is real annoying when it has that nice fancy graphical grey screen up with the spinning device at the … Continue reading →
Testing a TFTP server using Cenots 7
First su – yum -y install tftp If you are running iptables either: iptables -I INPUT -s ip.address.tftp.server -p udp -m udp –dport 2000:2020 -j ACCEPT 0r systemctl stop iptables If you are running firewalld Execute the command to permit … Continue reading →
Stop firefox from forcing https://
I have to deal with some older printers that dont have https:// set up on them – but every time I try to access them using Firefox – it changes the URL from http://printername.or.ip to https://printername.or.ip First – in the … Continue reading →
Find the PID and Names of Virtual Machines on Centos 7
On my Centos 7 system, I wanted to find out which VM was taking up a large amount of the processor: top – 14:43:15 up 3 days, 7:49, 2 users, load average: 1.66, 1.79, 1.99 Tasks: 442 total, 1 running, … Continue reading →
ssh fails to connect with debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
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 →
Auto logon with Gnome 3 / Centos 7
Note: You need supervisor privileges to make this change. Select the power icon in the upper right corner. Select your username from the drop down list Select Account Settings form under your username Select the Unlock button at the top of … Continue reading →
Select Boot Kernel In Centos 7
Update!! Use these instructions instead: https://docs.fedoraproject.org/en-US/Fedora/23/html/System_Administrators_Guide/sec-Configuring_GRUB_2_Using_the_grubby_Tool.html A typical CentOS 7 Linux system has multiple kernels. How many kernels you have in your CentOS systems depends on the configuration setting. Sometimes you might feel the need to change the … Continue reading →