Today i tried to update a driver for my USB Storage, the installation seems OK, but after it finished, i couldn’t use keyboard/mouse any longer. I know that my new driver has caused the problem. I rebooted the machine, try to login to safe mode with the hope to uninstall this bad driver. Unfortunately, the safe mode boot ok, but i still can’t use keyboard/mouse when i saw the login screen. I rebooted the machine as normal again, the windows booted fine. My thought: i can’t use keyboard/mouse physically, but the machine boots normally, so might be i can connect it from a different machineRead More →

It’s because they use 2 different SSL certificates , there are 3 common certificates that we are now using now DV ( Domain Validation ) is the most common one, it’s very cheap, easy to order. The CA will verify your domain, make sure that you are the owner of that domain by sending a verification email to your admin email contact on whois record or some other method. OV (Organization Validation) – is mostly for corporate , the CA will not only verify you are the owner of the domain, they also ask you some paper to verify your business address. EV (Extended validation)Read More →

Hi Buddy, I can’t open “Settings” on my Iphone any more, a client came to me with her IPhone 4 and said that. OK, i took her Iphone, open the Settings , it flashed and went away immediately, i did this several times. Well, as usual i do some trouble steps: 1. Restart the iphone = > not working 2. Hard reset by holding Home Button + Sleep Button , phone reboot but still could not get into the Settings 3. Let do a backup – connect to Itunes and do a Backup – > this step is necessary when we there is a chanceRead More →

I was trying to install TMS Component v6.0 into my Delphi 7 (yes, it’s very old), everything seems working fine. I can see the new components installed, i can drag it to my form. Run it perfectly. Then i saved the form, project , re-open them , an error message showing up: “Error Reading Form” – Class TAdvPage not found. What happened here? i could see it in my design pallet, i searched google and they suggest that the design package was not installed ? I could design it, so it must be installed. I have been struggling this for many days. It turned outRead More →

By default Apache only allows up to 150 connections , if you want more, you need to change the MaxClients parameter in apache.conf or httpd.conf . Apache also limit the max clients to 256 , if you want to override this value, you need to add ServerLimit. Here is an example to increase the max clients to 600. # prefork MPM # StartServers: number of server processes to start # MinSpareServers: minimum number of server processes which are kept spare # MaxSpareServers: maximum number of server processes which are kept spare # MaxClients: maximum number of server processes allowed to start # MaxRequestsPerChild: maximum numberRead More →

If you have multiple servers connecting to internet, these servers use Samba to share file with each other. Normally, you will Samba server for this purpose. After you install Samba & configure the server, all servers now can access file sharing now. But there is another issue, you realize that internet users can also access these files. How can we block internet users while still these servers sharing file with each other. There are many solutions, but here is my proposal: We create a virtual interface network, all our servers will have a 2nd virtual private interfaces , to do this you can add someRead More →

A gentleman came to me with his Iphone and asked for help, his iphone didn’t rotate automatically when he changed Iphone orientation. He said that he had done something with the setting, now he could not find it. I don’t remember it too , i go to General -> Settings , there is no option to change there. I did a little google search, and found the way to fix. It’s simple , just swipe up your phone, you will see the option there. Remember that not every application can change the orientation, some just use portrait , some use landscape only.Read More →

Just imagine, you manage a server remotely. The server has many disks, one day one of the disk could be failure. How can you tell the onsite engineer which drive is failure? The answer is you need to give the engineer the serial of the drive. So, the next question is , how can i get the serial? When the drive is dead, you can’t not get its serial, so you must record your server hard disk serial number, when something happens, you can access to your document and get it. Here is the command to get the serial number in Ubuntu: myuser@netbook:~$ sudo hdparmRead More →