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Mac OS X 10.9 – Wi-Fi : No hardware installed

March 16, 2015 by @HKw@! | No Comments | Filed in Mac OS X, MacBook Pro

I have updated My MacBook Pro to Mac OS X Mavericks.  Initially it working fine. After few week, i noticed that the WiFi wouldn’t work. When i clicked the wireless icon, it show the error Wi-Fi : No hardware installed.

Wi-fi No Hardware installed

To solve this problem, i tried to reset the System Management Controller (SMC) by removing the battery. Below are the steps:- Read the rest of this entry »

Default Username, Password and IP Address for all Dell SonicWALL Appliances

November 24, 2014 by @HKw@! | No Comments | Filed in Firewall

If you never setup Dell Sonicwall Appliances before, you sure do not know the default IP, username and password.

Below are the factory default administrator (admin) username, password and IP address for all categories of Dell SonicWALL appliances.

Product

Default Username

Default Password

Default IP Address

SonicWALL FIREWALL (UTM) APPLIANCES

admin

password

192.168.168.168

SonicWALL CONTENT SECURITY MANAGER (CSM) APPLIANCES

admin

password

192.168.168.168

SonicWALL SMB SSL-VPN APPLIANCES

admin

password

192.168.200.1

SonicWALL Aventail EX Series SSL-VPN Appliances

admin (AMC),
root (CLI)

Defined during
initial configuration.

192.168.0.10
(on internal interface)

SonicWALL  EMAIL SECURITY APPLIANCES

admin

password

192.168.168.169

SonicWALL CONTINUOUS DATA PROTECTION (CDP) APPLIANCES

admin

password

192.168.168.169

SonicWALL SonicPoint appliance

admin

password

192.168.1.20

DNS Query: Authoritative vs Non-Authoritative Responses

November 9, 2014 by @HKw@! | No Comments | Filed in DNS

I believe most of your used nslookup command to query  particular DNS record. Sometime, the nslookup return result with “Non-authoritative answer” follow by a list of nameservers. What “Non-authoritative answer” referring to?

When we sending DNS query to DNS Server, DNS server can provides either an authoritative or a non-authoritative response to the client query.

Below are the differences between Authoritative Responses and Non-Authoritative Responses

Authoritative

– An authoritative response is one in which the server returns an answer that it knows is correct, because the request is directed to the authoritative server that manages the domain. An DNS server is authoritative when it hosts a primary or secondary copy of a DNS Zone.

Non-authoritative

– A non authoritative response is one in which the DNS server that contains the requested domain in its cache answers a query by using forwarders or root hints. Because the answer provided might not be accurate (only authoritative DNS server can issue that domain information), it is called a non-authoritative response.