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“App Name” can’t be opened because it is from an unidentified developer” Error in Mac OS X Yosemite

April 20, 2015 by @HKw@! | No Comments | Filed in Mac OS X

I believed most of the Mac User that using Mac OS X 10.7.5 and above unable to install software that is not from Mac App store, example driver. Below screenshot will pop up when you trying to install software that is not registered with Apple by an identified developer

gatekeeper 1This is a new security feature called Gatekeeper that build in with Mac OS X 10.7.5 and above. The main purpose of this feature is to help protect your Mac from malware and misbehaving apps downloaded from the Internet. Read the rest of this entry »

How to do DNS lookup using Dig Command

April 16, 2015 by @HKw@! | No Comments | Filed in centos, Debian, Fedora, Linux, Mac OS X, Networking, RedHat, Ubuntu

Dig command is a command line tool use for querying DNS nameservers for information about host addresses, mail exchanges, nameservers, and related information. This tool is available on any Linux (unix) or Mac OS X operating system.

Example of using Dig Command

munkwais-MacBook-Pro:~ munkwai$ dig www.google.com

; <<>> DiG 9.8.3-P1 <<>> www.google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32350
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.google.com. IN A

;; ANSWER SECTION:
www.google.com. 299 IN A 173.194.126.80
www.google.com. 299 IN A 173.194.126.81
www.google.com. 299 IN A 173.194.126.83
www.google.com. 299 IN A 173.194.126.82
www.google.com. 299 IN A 173.194.126.84

;; Query time: 44 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Thu Apr 16 04:29:00 2015
;; MSG SIZE rcvd: 112

Read the rest of this entry »

Supermicro Server – Stuck at System Initialization

April 14, 2015 by @HKw@! | No Comments | Filed in Server Hardware

One of my SuperMicro Server fail to boot up. It stuck at system initialization with a post code “B7”.

IMG_20150414_172643

After i did some research, i found out  the stop code error B7 or B9 are relate to memory module. I tried do test the RAM by one and found out one of the RAM faulty. I proceed to change the RAM and the Server back to normal.