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In: Phone

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 →

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In: Programming

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 →

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In: Linux

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 →

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In: General, Linux

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 →

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In: General, Phone

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 →

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In: Linux

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 →

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In: Linux

Simply run this command, replace example.crt with your actual certificate file: $ openssl x509 -noout -text -in example.crt Certificate: Data: Version: 3 (0x2) Serial Number: .. Signature Algorithm: sha256WithRSAEncryption Issuer: C=GB, ST=Greater Manchester, L=Salford, O=COMODO CA Limited, CN=COMODO RSA Domain Validation Secure Server CA Validity Not Before: Sep 10 00:00:00 2014 GMT Not After : Sep 10 23:59:59 2015 GMTRead More →

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In: Linux

It’s simple, just run this command $ openssl req -noout -text -in example.csr | grep ‘Signature Algorithm’ Signature Algorithm: sha256WithRSAEncryption If the value is sha256WithRSAEncryption, the certificate is using SHA-256 (also known as SHA-2). Another common value is sha1WithRSAEncryption, that means the certificate is signed with SHA-1.Read More →