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Read MoreApplications that handle a huge number of TCP connections, either as a server, or as a client, will often see a large number of sockets in TIME_WAIT state.
The sockets in TIME_WAIT can be seen with the “netstat -epn –tcp ” command.
If the number of TIME_WAIT sockets gets too large, your address space will be exhausted, causing a disruption of TCP traffic.
If you try a little Googling, you may be find tcp_fin_timeout option .
Do not be confused by the /proc/sys/net/ipv4/tcp_fin_timeout config item. The FIN TIMEOUT is not the same as the TIMEWAIT length.
You can force the kernel to reuse the TIME_WAIT buckets though, by setting the /proc/sys/net/ipv4/tcp_tw_recycle entry to 1. I have tested this, and it works: very few TIME_WAIT entries will be present when using this setting.
# echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle
or
add net.ipv4.tcp_tw_recycle = 1 to /etc/sysctl.conf .
1. Check /var/log/mail.log and see what the error
2. If you see this “postdrop: warning: unable to look up public/pickup: No such file or directory”
Do this :
# /etc/init.d/sendmail stop
# mkfifo /var/spool/postfix/public/pickup
# /etc/init.d/postfix restart
3. If you get 550 verification error
edit file /etc/postfix/main.cf
Change the servername to full dns name for ex: servermail to servermail.yourdomain.com
verify servermail.yourdomain.com from public internet
What’s new:
- Improve the performance , the time to complete the scan now is 50% faster than before.
- Fix some device id
Want to change the default mysql data_dir (/var/lib/mysql) to new location (new partition, new disk ?)
Steps to do:
1. stop mysql ( /etc/init.d/mysql stop)
2. copy your mysql data directory to new location ( mv /var/lib/mysql/ /newlocation/mysql/)
3. chown -R mysql:mysql /newlocation/mysql
4. edit file /etc/mysql/my.inf ( change data_dir location)
5. edit file /etc/apparmod.d/usr.sbin.mysqld (change /var/lib/mysql to your new location)
6. start mysql (/etc/init.d/mysql start)
You can run the following command to see what Apache module is loaded
apachectl -t -D DUMP_MODULES
or,
httpd -t -D DUMP_MODULES
Read MoreI am pleased to extend to you, on behalf of myself and the whole DriverIdentifier Team, wishes for a very Happy Thanksgiving and an enjoyable holiday season.
Read MoreTo install all the drivers are ready, we can begin to install the driver. Driver installation methods there are many, following slowly from easy to difficult to see.
1. The easiest one – From Installation Disk - Install from setup.exe
Now hardware vendors have increasingly focused on the humanity of its products, including the installation of the driver simplification, where so many drivers come with a “Setup.exe” to executable file, simply double-click it, then all the way “Next (Next)” to complete the driver installation. Some hardware vendors provide drivers joined the Autorun CD files from the start, as long as the CD into the computer’s optical drive, the CD will start automatically.
Then click the appropriate starting interface name of the driver can automatically start the installation process, this very user-friendly design makes installing the driver is pretty easy.
2. Manual Install
Installing drivers from CD is a traditional and most used approach to install required drivers as you can get thousands of drivers in a single CD and you don’t even need an Internet connection for installing drivers from a CD.
Right Click on “My Computer” from desktop and go to “Properties” from the menu.
Click on Hardware and then on Device Manager
You will see a yellow icon alongside un-installed drivers.
Right Click on that Yellow icon and select “Update Drivers”
Now, a new box will appear with couple of options, check the Last option and click on NEXT.
From the next page, click on NEXT again.
Now, Select the location you keep the drivers ( where the .inf file located)
After Installation, Click on Finish and Restart your computer.
Thats it!
Problem:
I am trying to access few files from C:\Windows\System32\Winevt on Windows 7 – 64 bit machine through .net application.
When I build my application in 32 bit , I am not able to access this Winevt directory. It complians about directory not found.
But If I build my application in 64 bit mode, I am able to access this directory without any problem.
Do I have to do anything special to access this directory using 32 bit application on 64 bit machine?
Reason:
a computer that is running a 64-bit version of Windows Server 2003 or of Windows XP, a 32-bit application cannot access the following folder: %WinDir%\System32
This behavior occurs because Windows on Windows 64-bit (WOW64) provides file system redirection.
In a 64-bit version of Windows Server 2003 or of Windows XP, the %WinDir%\System32 folder is reserved for 64-bit applications. When a 32-bit application tries to access the System32 folder, access is redirected to the following folder:
%WinDir%\SysWOW64
By default, file system redirection is enabled.
Solution:
As a walk-around solution, 32-bit applications can access the native system directory by substituting %windir%\Sysnative for %windir%\System32. WOW64 recognizes Sysnative as a special alias used to indicate that the file system should not redirect the access.
So, if we want to access C:\Windows\System32\Winevt folder from 32-bit application, we can use C:\Windows\Sysnative\Winevt instead.
We created some basic video tutorial to help you using Driver Identifier easier.
You can see them here at.
http://www.driveridentifier.com/video.php