Turn off wifi radio in Linux / Centos
I have a few boxes that have built in wifi and I dont need it turned on. So I turn it off using the following command nmcli radio wifi off To make sure the wifi radio stays turned off in … Continue reading →
Category Archives: Centos 7
SSH WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!
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 →
Route email destined for a selected domain to /dev/null
I wanted to do some testing with some forms on my web site, but I did not want to deal with the resultant output going to email. I added the following line to the /etc/postfix/transport file fubar.com discard Then I … Continue reading →
Installing MATE on CentOS 7
First install the EPEL-repositories then install the X Window System yum -y install epel-release yum -y groupinstall “X Window system” Install the MATE packages. This will take a few minutes yum -y groupinstall “MATE Desktop” Tell your system to start … Continue reading →
Show available wifi networks
nmcli dev wifi nmcli -f ALL dev wifi For more information see here
Continue reading →How to disable PackageKit on CentOS 7
Problem: You go to install a package with yum command on CentOS and you get the error saying that “Another app is currently holding the yum lock; waiting for it to exit… The other application is: PackageKit”. PackageKit get launched … Continue reading →
xfreerdp and Cache Glyph
Problem: xfreerdp starts up with the following messages [14:51:24:005] [14065:14066] [ERROR][com.freerdp.core.update] – [0x03] Cache Glyph – SERVER BUG: The support for this feature was not announced! Use /relax-order-checks to ignore [14:51:24:005] [14065:14066] [ERROR][com.freerdp.core.update] – order flags 03 failed [14:51:24:005] [14065:14066] … Continue reading →
Updating Dell srvadmin-omilcore package signature verification failure
Updating or installing Dell’s srvadmin package and you got this: warning: /var/cache/yum/x86_64/7/dell-system-update_dependent/packages/srvadmin-omilcore-9.1.0-3013.13047.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 34d8786f: NOKEY Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-Dell-DSU The GPG keys listed for the “dell-system-update_dependent” repository are already installed but they are not correct … Continue reading →
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 →
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
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