Category Archives: ITechLounge

Linux : How to create a SAN SSL certificate request

This procedure will show you how to create Subject Alternate Name (SAN), or in other words, a certificate request with multiple Common Name (CN) DNS aliases. It order to do so, we need to create a CSR request template as shown below: 1. Create the certificate request template as followed:

[req]
		distinguished_name = req_distinguished_name
		req_extensions = v3_req
		prompt = no
		[req_distinguished_name]
		C = Country Letter Code
		ST = State or Province
		L = City
		O = Company Name Inc.
		OU = Division Name Inc.
		CN = CommonName.Domain.TLD
		[v3_req]
		keyUsage = keyEncipherment, dataEncipherment
		extendedKeyUsage = serverAuth
		subjectAltName = @alt_names
		[alt_names]
		DNS.1 = AlternateHostName1.Domain.TLD
		DNS.2 = AlternateHostName2.Domain.TLD

[req]

distinguished_name = req_distinguished_name

req_extensions = v3_req

prompt = no

[req_distinguished_name]

C = Country Letter Code

ST = State or Province

L = City

O = Company Name Inc.

OU = Division Name Inc.

CN = CommonName.Domain.TLD

[v3_req]

keyUsage = keyEncipherment, dataEncipherment

extendedKeyUsage = serverAuth

subjectAltName = @alt_names

[alt_names]

DNS.1 = AlternateHostName1.Domain.TLD

DNS.2 = AlternateHostName2.Domain.TLD

Note: Edit all fields… Read More »

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Linux : How to rename the network interface in CentOS/RHEL7

Since the latest major version release of CentOS/RHEL 7, it seem that we wen’t a bit crazy about the whole systemd thing… Seriously, having a network interface named “eno16780032” isn’t that great! Fortunately, there is a a way of getting back the old naming convention by following these steps : 1. Edit the Grub configuration… Read More »

ScreenOS : Failed to upgrade via WebUI and bogus image not authenticated on console

If you tried to upgrade your Juniper SSG ScreenOS version lately using the WebUI and got the message “Failed to upgrade” and the console output showed : ********Invalid image!!! ********Bogus image – not authenticated!!! Fips check failed (This would output the same if you tried to manually upgrade from the console). This could indicate two… Read More »

VMware : Unable to connect to the MKS: Login (username / password) incorrect

Having the following error while trying to open the console of your guest VMs? Unable to connect to the MKS: Login (username / password) incorrect This is happening because the communication between your client computer and your vSphere host isn’t working properly. The main cause for this would be that the ports required for the… Read More »

Fix compile error: “fatal error: ‘libelf.h’ file not found”

Recently, when I try to build an open source project, I meet the following compile error:

fatal error: 'libelf.h' file not found
#include <libelf.h>
         ^
1 error generated.

fatal error: 'libelf.h' file not found

#include <libelf.h>

1 error generated.

The solution is installing elfutils-libelf-devel package:

sudo yum install elfutils-libelf-devel

1	sudo yum install elfutils-libelf-devel

Or:

sudo dnf install elfutils-libelf-devel

1	sudo dnf install elfutils-libelf-devel

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