How to clear cache on local DNS servers. Cannot clear DNS resolver cache

Sometimes, it happens that the Internet connection settings go wrong or simply does not want to connect to the network (does not receive an IP address via DHCP). Similar problems can arise as a result of the operation of some malware(viruses). You can torture those for a long time. support from your provider or call a specialist at home. You can try to fix the problem yourself.
To reset TCP/IP in Windows NT (2000/XP/Seven) operating systems, there is special program netsh.exe.

netsh.exe— (Network Shell) allows you to configure network parameters.

Some nasty viruses get into WinSock and cause mischief.
Symptoms:

• The speed of downloading files via TCP is very low (while downloading via UDP can be fast);

• When you turn on the computer for a while, a couple of minutes, the Internet works fine, but then it disappears completely (the speed drops to 0);

• The Internet works and the download speed is normal, but the downloaded file turns out to be broken because it is not downloaded completely (most likely the virus intercepts some of the packets during transmission, but sends a notification to the source that all packages have been successfully received).

In addition to viruses, you can also “break” your Internet connection yourself (or it “got wrong”)

Some examples:

• The computer does not receive an IP address automatically (via DHCP);

• IP addresses are pinged but not names;

• The computer receives an IP address of the following type: 169.254.*.*;

If you have cleared yourself of viruses, you can begin recovery. ATTENTION! The following procedures will reset your network settings. I strongly recommend rewriting the settings.
To reset Winsock:

If the first command did not help solve the problem, you can reset the TCP/IP stack to factory settings:
There in the command line, enter the command:

netsh int ip reset c:\resetlog.txt

In this case, the reset log will be saved in the root of the C:\ drive; if you omit the c:\ prefix, the log will be saved in the current directory. After this, you should restart your computer.

After using this command, the following registry branches will be reset to factory settings:

SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\
SYSTEM\CurrentControlSet\Services\DHCP\Parameters\

You can use these commands together one after the other. By the way, they also reset the DNS cache.
About DNS cache problems: For example, the site moved to another hosting, as a result its IP address changed. And since you have some not quite fresh data in your cache, when you enter the site name, you will be taken to the old IP address, where the site no longer exists.

To avoid resetting all settings, try the command ipconfig /flushdns If it doesn't help, use netsh int ip reset resetlog.txt- this is guaranteed to help and reset everything related to network connections. 😉

If you use the services of medium and small providers, you can often witness bugs in the operation of their DNS servers. This may be due to incorrect settings, problems with the hardware, or errors by the administrators themselves. And the users pay for it, of course. In the best case, instead of the necessary sites, it will display “Server not found”; in the worst case, it will start throwing out to all sorts of incomprehensible sites, incl. even harmful in nature. And so you changed the addresses of the DNS servers and... the same thing continues. What to do? You just need to clear the DNS cache windows client.

There are two ways to reset the DNS cache:

Method 1: Command Line

Click the “Start” button and write the phrase “Command Prompt”. It doesn’t matter - Windows 7 or Windows 8, or even Windows 10 - in all versions the search will start and in its results there will be a command line shortcut. Click on it and get a black console window. You need to write the command in it:

ipconfig /flushdns

And press the Enter button. It should look like this:

If everything went well, the result should be the message “Successfully flushed the DNS Resolver Cache”. This means that clearing the DNS cache was successful. You can also run the command to be sure:

netsh winsock reset

This will reset Winsock settings. Sometimes this helps too.

If you have any problems with command line, or you need to clear the DNS cache often, then use this bat file - download.

Method 2: Restart the windows DNS client

Press the Win and R buttons and get the “Run” window:

In it we type: services.msc and click the “OK” button. Thus we launched the system management console Windows services. Here you need to find the DNS client service:

Click on it with the mouse to highlight it and click on the “Restart” link, indicated by the arrow in the figure. After restart it will happen DNS reset windows cache.

set-os.ru

How to clear the cache of a Windows 7 computer

Surely you have often heard the phrase - clear the cache. Allegedly, this will increase the speed of the computer. This is true to some extent, but what is the windows cache and where can I find it? The word itself comes from the English verb cacher, that is, “to hide.”

Therefore, we are talking about files that are securely hidden from the user’s eyes. That’s right, you need to go through a lot of folders to clear the entire cache of a computer running under windows control 7, XP or other version. But there is more simple ways.

General concepts

There are at least 4 types of cache:

• browser-based;
• file thumbnails;
• RAM ( random access memory).

In addition, some programs may create their own temporary files during their operation. To remove them, just clear the RAM CACHE.

Before we begin to consider cleaning methods, it is worth answering the question - what does removing these invisible files? In most cases, the browser cache, for example, is great amount small files that accumulate during computer operation.

We watched an online video and it is already in the cache and will be there until you reboot or manual cleaning. We launched the game and it took up most of the RAM. But when you leave the game, part of it may remain occupied. It's the same with some programs. In this case, the RAM may not be enough for other tasks. And on the hard drive, temporary files without cleaning begin to take up gigabytes of memory for a long time.

Why endure this when you can clear the cache quickly and easily?

Browser methods

In this case, there is no single recipe. Various programs offer their own variations. You can clear temporary files in your browser by going to its settings. U Google Chrome the required item is called “Clear history”.

See also: How to change fonts on a Windows 7 computer

Be careful: you can choose to clear only the CACHE or simultaneously delete saved passwords, browsing history, settings for sites, and so on.

U Internet Explorer This option is called “Delete browsing history”, and in Firefox it is called “Delete recent history”.

Method for clearing memory

To unload RAM from excess junk and speed up your computer, first look at: Start - Computer (right mouse button) - Properties. If your Windows is 32-bit, open Start again and run the Run program.

Copy the command into a new window:

%windir%\system32\rundll32.exe advapi32.dll,ProcessIdleTasks

and execute. Memory cleared! For 64-bit windows use this command:

%windir%\SysWOW64\rundll32.exe advapi32.dll,ProcessIdleTasks

Methods for DNS cache

It's about about stored data regarding computer requests to Internet servers. If you want to clear this history completely, do simple steps:

• Open Start.
• Go to All Programs - Accessories.
• Launch Command Prompt as Administrator (right-click).
• In the window, type ipconfig /flushdns and press Enter. Ready!

Sometimes clearing your DNS history is enough to open a site that doesn't want to load.

Methods for thumbnail files

This type CACHE allows thumbnails of photos or videos to be loaded faster. This is especially useful when there are dozens or hundreds of files in a folder. So decide whether to clean them.

• Open Start.
• In the search bar, enter “Disk Cleanup.”
• In the launched program, select required disk and click on the OK button. The application will scan the disk for temporary files.
• In the list that appears, select “Thumbnails”.

OK and “Delete files”. Ready.

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windowsprofi.ru

Clearing the DNS cache on a Windows computer

Most Internet users access their favorite resources from home or office computer. Thanks to synchronization, you can start reading at work and continue at home. But have you at least once in your life encountered the fact that on one computer a website works great, all pages are accessible and open almost instantly, while on another you cannot connect to the server at all? If you are reading this article, you have probably encountered it.

Yes, the problem very often occurs due to the fault of the Internet service provider. Especially if it is some kind of local company, and not a federal giant with representative offices in all regions of the country. If there is no reason to believe that your provider’s DNS servers are not working correctly, or the problem recurs when you change the server address in the settings network card computer or in the router itself, the problem is clearly internal. And she was called incorrect work DNS cache.

How to clear DNS cache? How does it function and why are there problems accessing certain sites? We will give answers to these questions in today's material. Please read the instructions carefully if you also encounter a similar situation.

What is DNS and why do you need to clear its cache?

If you explain very in simple words, then DNS is a kind of Notebook or a database of all available Internet sites. When you're in address bar browser, enter the name of the site, the computer converts this address into digital format, consisting of 4 groups of numbers separated by dots. The DNS server's task is to match a regular alphabetic address with a digital one as quickly as possible. The larger the provider and the better it works technical support, the better and faster the DNS server will function.

The closer the DNS is geographically located to your computer, the faster connections to the right page. This is why almost every provider recommends using own server instead of public ones, such as Yandex or Google DNS. To speed up work, the computer caches information about all visited sites and stores it in the system. windows section. This cache is stored both on the operator’s server and on local computer. Therefore, if on different computers the site functions differently, you need to clear the DNS cache on problem computer.

Reset cache DNS services possible in several ways. Let's take a closer look at each of them.

Clearing the DNS cache

Via command line

It is very simple and at the same time almost the most in a reliable way. To clear the DNS cache on a computer with Windows 10, you need to run the command Windows line as administrator and apply several commands.

Depends on windows versions, you can get to the command line like this:

• windows 10. Right-click or press the Win + X key combination, and then select the line “Command Prompt (Administrator)”.
• windows 8–8.1. Press the Win + R key combination, type cmd and press Enter.
• windows 7. Similar to windows 8, press the Win + R combination, then type cmd in the search window and press the Enter key.

• ipconfig /flushdns;

  Clearing the DNS cache via the command line

• ipconfig /registerdns;
• ipconfig /release;
• ipconfig /renew;
• netsh winsock reset.

Each command must be used in turn and its input must be confirmed Enter key. When finished, be sure to restart your computer. Clearing the DNS cache on your Windows 7 PC should resolve problems with some web resources being unavailable.

By restarting the DNS client

To manage the DNS cache, a special windows service. It can be controlled through a special computer control menu. Regardless of the operating system version, you can get into it in one of the following ways:

To clear the cache, you need to find the “DNS Client” service, click on its icon once, and then click the “Restart” button in the left column. After this also do restart windows and try to log in to the site again. Everything should work like clockwork.

Restarting the DNS Client

Conclusion

The problem with accessing some web resources due to an incorrectly working DNS cache on your computer can be solved very simply and quickly. If you use our instructions, you can get rid of difficulties in just a few minutes. If you notice that your computer often does not allow you to access certain sites, you will need to clear the cache regularly. In the comments, we ask you to write which of the two solution options helped you.

NastroyVse.ru

How to clear cache in windows 7

≡ 4 July 2015 · Category: Computer educational program· 35,863 Views

IN operating system Windows has several types of cache memory. When it becomes full, it creates problems in the operation of the OS. It becomes especially noticeable during long work computer.

How to clear cache memory

Right-click on the desktop “Create” - “Shortcut”.

Enter one of the following values ​​in "Specify the location of the object."

32-bit: %windir%\system32\rundll32.exe advapi32.dll, ProcessIdleTasks 64-bit: %windir%\SysWOW64\rundll32.exe advapi32.dll,ProcessIdleTasks

32-bit: %windir%\system32\rundll32.exe advapi32.dll, ProcessIdleTasks 64-bit: %windir%\SysWOW64\rundll32.exe advapi32.dll,ProcessIdleTasks

Enter any name convenient for you and click “Done”

Launch the shortcut whenever you want to free up RAM.

Or another way. Just copy the above values ​​to “Run” (WIN+R) and click “OK”

This will remove unused RAM.

Clear DNS cache windows 7

DNS cache is used to store information about what requests computers made to different servers. When a secondary request occurs to a particular server, the cache memory picks up the entry, thus eliminating the need for unnecessary requests. DNS user should update when there is a need to update complete information Online.

Launch the command line (Start -> All Programs -> Command Prompt). Enter the key ipconfig /flushdns.

Clearing thumbnails

This is done using the Disk Cleanup program. Go to “My Computer”, right-click on “ Local disk WITH". Select “Properties” from the menu. Open the “General” tab

In the window that opens, in addition to what you need, you can also select Extra options cleaning. Then click “OK” and “Delete files”.

If you wish, you can turn this off altogether. This is done in the local editor group policy operating system (Win+R enter the command gpedit.msc and “OK”). Next, follow the picture and turn it off.

How to clear your browser cache

In any web browser, press the hotkey combination CTRL+SHIFT+DEL and select the one you need.

You can also use CCleaner.

What methods do you use?

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How to clear windows 7 cache?

For those who don't know yet - in the operating room windows system There are several types of cache memory, which in some cases need to be cleared. For example, if there are problems with the system. Let's consider several cases.

How to clear DNS cache in Windows 7?

The DNS cache stores information about the computer's requests to various servers. If the cache already contains information about the computer’s access to such and such a service, then when accessing the specified resource again, its loading speed can significantly increase. However, in some cases it is necessary to clear the DNS cache if, for example, you experience some problems when accessing various resources that are not related to the cache in browsers.

To do this, you need to launch the command line (click “Start” - “All Programs” - “Accessories” - “Command Prompt”) and write ipconfig /flushdns.

How to clear the computer's RAM cache?

Now we will clear the computer's cache memory. This operation will take us a little longer.

On the desktop, right-click on the mouse and select “Create” - “Shortcut” from the menu.

A window will appear. It must indicate the location of the object. To do this, write one thing in the line depending on the configuration:

windows 32 bit: %windir%\system32\rundll32.exe advapi32.dll,ProcessIdleTasks

windows 64 bit: %windir%\SysWOW64\rundll32.exe advapi32.dll,ProcessIdleTasks

And click on the “Done” button.

An icon appeared on the desktop. To clear the cache memory, simply double-click on the indicated icon.

How to clear the thumbnail cache?

Sketches are miniatures of pictures. When you re-download an image, the latest one loads faster. In some cases, however, sketches can take up a lot of space.

Clearing the thumbnail cache is easy. Go to “Computer”, right-click on system disk(usually drive C) and select “Properties”. a window appears. On the General tab, click Disk Cleanup.

Please wait while the system evaluates.

Select “Thumbnails” and click “Clean up system files”.

DNS (Domain Name System) cache is special files to establish compliance with domain names and reducing the load on the system. This data is securely deleted, freeing up disk space.

In addition, it is possible various problems in the operation of the DNS servers themselves. For example, due to incorrect setting, hacking or due to any hardware problems, the “server not found”, “left” or infected site page opens. Flushing the DNS cache solves all these problems.

Clear DNS cache in Windows 10

To examine the list of resource entries in the cache Windows DNS 10, in the command line with elevated privileges (As Administrator), enter the command ipconfig /displaydns. To reset the cache, simply enter the command:

ipconfig /flushdns

Right key on the Start button

And then we enter the commands presented above.

If the cleanup is successful, the response should appear: The DNS resolver cache was reset successfully.

Alternative methods

Via the netsh winsock reset command or by restarting the DNS client service. The restart is performed using the services.msc console. Right click mouse click on DNS Client, then click on “Restart”.

The second restart option is from the command line, into which you need to enter net stop Dnscache && net start Dnscache.

When you run the ipconfig /flushdns command, you may see the error "Failed to flush the DNS resolver cache: The function was interrupted during execution." This is usually due to the DNS service being disabled in Windows 10. To resolve this issue, simply restart the DNS Client service.

Temporary files

Windows 10 has system directory for temporary files. It may accumulate unnecessary components and data. To remove them you need:

1. open “Start”, then “All applications”, go to “Administrative Tools” and select “Disk Cleanup”;
2. specify the drive with installed Windows 10 and wait while it is analyzed file system;
3. in the cleaning window, uncheck all the boxes, leaving only the temporary files item, and click OK.

How to Delete DNS Cache on Mac OS

Let's look at the removal option using Mac OS Yosemite as an example. For complete cleaning cache in in this case You want to remove information from multicast DNS (MDNS) data and from one-way UDNS data. First of all, you need to try entering the dscacheutil command. If it doesn't work, try other options.

Clearing UDNS and MDNS separately

You need to launch the Terminal by pressing Ctrl + Space and entering the word “terminal” in the search field. An administrator password is required to run commands. The command sudo discoveryutil mdnsflushcache clears the MDNS cache, and sudo discoveryutil udnsflushcaches clears the UDNS.

Simultaneous cleaning

To simultaneously clear group and one-way data transfer systems, the command sudo discoveryutil mdnsflushcache;sudo discoveryutil udnsflushcaches;say flushed is provided.

Removing DNS cache of other versions

Experienced users know that the method for resetting the DNS cache varies Mac versions OS may vary. Let's list the commands that can be used on other versions.

• OS X Mountain "Lyon" - sudo killall -HUP mDNSResponder.
• OS X Mavericks - dscacheutil -flushcache; sudo killall -HUP mDNSResponder.
• OS X Lyon - sudo killall -HUP mDNSResponder.
• OS X Snow "Leopard" - sudo dscacheutil -flushcache.
• OS X Tiger - lookupd -flushcache.
• OS X Leopard - sudo dscacheutil -flushcache.

Additional commands for Mac OS

To get statistics about the UNDS cache, type Sudo discoveryutil udnscachestats. Group DNS information opens by typing Sudo discoveryutil mdnscachestats. Checking for changes in values ​​can be done using the command entered into the URL request: dig your server name.

Let's imagine this situation: you decide to go online and visit some site, maybe even this one. And then you get an error that the page does not exist, the user refreshes the page several times, and then simply closes it. Of course, a site subscriber will visit the site again after some time to check its functionality, but a new visitor is unlikely to return. It is clear that this is bad both for the site owner and for the user who is looking for information.

This problem happens either on the hosting side where the site is located, or thanks to scammers or other “bad guys” who somehow hacked into the admin panel and changed the DNS servers.

From the above it is clear that the problem must be solved. For those who haven’t yet understood what DNS addresses are, I’ll explain now.

What is DNS and how to access a site?

Everyone has computer devices on the planet there is a specific name with which they can communicate with each other; these names have digital values ​​and are called IP addresses. DNS stands for Domain Name System and converts the alphabetic value into a numeric value. In other words, you go to a website, and using the domain name system it is converted to something like 22.222.222.22. You can check the IP address of your computer like this: open the command line and enter the command there ipconfig .

Thus, your computer, when visiting my site, will communicate with the computer on which the site is located, that is, a connection between IP addresses.

When you change DNS addresses to the left ones, you will be shown a message that the page does not exist, although in fact it exists and is stored on the hosting.

How to solve a problem?

If the problem is on the provider’s side, then you need to wait an hour or two; during this period, DNS addresses are usually updated. At this time, if you can’t wait to go to the site, you can use anonymizers or DNS servers from Google.

The next reason is your computer's DNS cache. In Windows, there is a DNS cache, that is, when you visit any sites, information about DNS and other data is entered into the cache so that the next time you visit the page, the process of opening the page will be faster. It is possible that data about other DNS servers got into the cache, and even if the site owner has already fixed everything, or everything has been fixed on the hosting side, the cache will not simply disappear from your computer.

To clear the DNS cache, you need to open a command prompt as an administrator and enter the command ipconfig /flushdns .

After of this action the cache will be cleared.

You can still reset network settings, for which in the same command line we enter the command netsh winsock reset. Then we restart the computer.

Now you know what to do if the page is not accessible. But this is not the only reason, there are many others and we will talk about them in future articles.

If you use the services of medium and small providers, you can often witness bugs in the operation of their DNS servers. This may be due to incorrect settings, problems with the hardware, or errors by the administrators themselves. And the users pay for it, of course. In the best case, instead of the necessary sites, it will display “Server not found”; in the worst case, it will start throwing out to all sorts of incomprehensible sites, incl. even harmful in nature. And so you changed the addresses of the DNS servers and... the same thing continues. What to do? You just need to clear the Windows client's DNS cache.

There are two ways to reset the DNS cache:

Method 1: Command Line

Click the “Start” button and write the phrase “Command Prompt”. It makes no difference - Windows 7 or Windows 8, or even Windows 10 - in all versions the search will start and in its results there will be a command line shortcut. Click on it and get a black console window. You need to write the command in it:

And press the Enter button. It should look like this:

If everything went well, the result should be the message “Successfully flushed the DNS Resolver Cache”. This means that clearing the DNS cache was successful.
You can also run the command to be sure:

This will reset Winsock settings. Sometimes this helps too.

If you have any problems with the command line, or you need to frequently clear the DNS cache, then use this bat file - download .

Method 2: Restart Windows DNS Client

Pressing the buttons Win And R and get the “Run” window:

In it we type: services.msc and click the “OK” button. Thus, we launched the Windows service management system console. Here you need to find a service DNS client:

Click on it with the mouse to highlight it and click on the “Restart” link, indicated by the arrow in the figure. After restart it will happen reset Windows DNS cache.