How do I flush the dns?

My laptop is running really slow. I have done all of the normal stuff like deleting internet temep & the cache. I was told that "Flushing the DNS" could help me but my Son only has pc's so didn't know how to do it on a Mac.
Any help would be appreciated!
Thank you in advance! ~Laurie

Cache and temp files exist to increase performance and should not require manual deletion.
The first thing to do is ensure you have adequate backups, because what you describe can be a symptom of impending disk failure.
To help determine the possible causes of this behaviour read the following. None of what follows is intended to fix anything, but it will provide the additional information required to advance troubleshooting. There are four separate parts to it; read everything first.
Boot OS X Recovery by holding ⌘ and r (two fingers) while you start your Mac. At the Mac OS X Utilities screen, select Disk Utility. Select your startup volume (usually named "Macintosh HD") and click the Repair Disk button. Describe any errors it reports in red. If Disk Utility reports "The volume Macintosh HD appears to be OK" in green then you can be reasonably (though not completely) assured your hard disk is in good working order.
When it finishes restart your Mac and test again for operation. If it's still not behaving as you expect it should, please post the results of EtreCheck in accordance with the following instructions:
Apple Support Communities contributor etresoft wrote a very useful app to quickly gather certain system information that may help point to a cause of this problem. Read about it here. It contains a link to download EtreCheck. Don't download it from anywhere else (such as may be found by following the results of an Internet search).
Click Open - etresoft contributes to this forum frequently and can be considered a trustworthy developer.
It will take a moment to run as it collects its data.
Copy and paste its output in a reply.
Do not be concerned about anything that says "Problem" or “failed” or anything else that may appear in red.
EtreCheck was designed to remove any personal information (such as your computer's name and serial numbers) but if you see anything that looks like an email address or any other personal information that should not be divulged to others, please delete or obscure that information when you post the reply.
When you are finished with EtreCheck, quit the program. It occupies very little space, and you can keep it or drag it to the Trash as you wish.
After completing the above please determine if the problems also occur in "Safe Mode":
Safe Mode or "Safe Boot" is a troubleshooting mode that bypasses all third party system extensions and loads only required system components. Read about it: Starting up in Safe Mode
You must disable FileVault before you can start your Mac in Safe Mode.
Starting your Mac in Safe Mode will take longer than usual, graphics will not render smoothly, audio is disabled on some Macs, and some programs (iTunes for example) may not work at all.
Merely starting your Mac in Safe Mode is not intended to resolve the problem, it's to observe its performance without certain additional components.
To end Safe Mode restart your Mac normally. Shutdown will take longer as well.
System performance problems for reasons that cannot be isolated to any other cause justify an SMC reset. Be sure to read the procedure carefully and follow all the steps exactly as written, even if they seem inapplicable or trivial.

Similar Messages

Flush the DNS cache

How do i flush the DNS cache on an iPhone?

TrYaN73 wrote:
How do i flush the DNS cache on an iPhone?
There's no specific way to do that exact thing in iOS. However, resetting network settings will help resolve a lot of network-related issues for both Wi-Fi and cellular connections.
Reset network settings by tapping Settings > General > Reset > Reset Network Settings.

How do I flush my DNS cache

My internet lookup is slow. I have read that I can fix this by using either openDNS or googleDNS servers. How Do I flush my DNS cache after switching DNS servers?

Restart the computer.

I have 2 websites and 1 IP address for my server, how do I set the DNS up?

I am having trouble following the boards and the Server Admin instructions to make sure I can activate a website.
IP address for the Snow Leopard Server on a mac mini
Server Settings for Web has the 2 domain names listed pointing to the same IP address and same port 80.
How do I point the DNS correctly to the domain I want to respond? www.ziggythewinegal.com
If you put the IP address in a browser, it returns the default domain which is just the apache/osx server page. 64.142.85.71
If you put the first domain name in a browswer, it does the same. www.JoelQuigley.com
How do I setup the DNS to www.ziggythewinegal.com which is in the folder WebServer>ziggy>index.php ?

64.142.85.71 has an existing public DNS translation, so you'll be adding DNS CNAME (alias) records for the each of the additional hosts into your public DNS at WorldNIC DNS servers.
Your local host either isn't running DNS, or it's running local DNS. If it's running local DNS, then hopefully it's not running with the same domain name as your public DNS services; that you have an external DNS zone and an internal DNS zone, with an external DNS domain and an internal domain name. If you are running DNS locally and are using the same domain name for internal and external DNS servers, then you'll also need to add the translation for the new web sites into your local DNS server configuration.
Once the translation is added, add - as John Lockwood indicates - Sites into your web server.
The numbers of folders can vary. Different sites may or may not be in the same folder, depending on what you're doing. Multiple ttraditional static HTML web sites are probably stored in separate folders. A single site with several names can be in the same folder. A web content management system (CMS) can be stored in one folder.
If you have a firewall here (and you should), then you may need some additional steps. Particularly if you're running NAT, and don't already have rules and port-forwarding enabled on the server. Given it appears you're using mail with this server, there are likely some rules in place, though you'll need to confirm that port 80 TCP and possibly port 443 TCP are (also) being forwarded for your web services.
Here is a write-up on adding what Apple calls Sites and what Apache calls virtual hosts.

How do I change the DNS settings to BC but keep the MX setting for emails?

How do I change the DNS settings to Business Catalyst but keep the MX settings for emails?
I'm basically created anew site using Muse and want to host it on BC and upgraded to the Web basics + to allow for hosting of downloadable pdf's etc.
There are up to 50+ emails address set up on the current set up and I want to just change the NDS settings for the domain to ponit to the new site/hosting an not have to worry about them chaning all the meail settings etc.
Records do I need to change in BC?
Thanks
Iain

Hi,
You shouldn't need to do anything as long as you do not state hosting email with BC. Just ensure to check you DNS in a lookup tool that it's still referencing your external email service.
Otherwise you can set up external email set-up if the option is present.
- http://helpx.adobe.com/business-catalyst/partner/set-email-external-email-provider.html
Kind regards,
-Sidney

Flushing the DNS cache

I'm having trouble with a Web site when I access it on my home computer, yet this same site looks fine on my Mini at work. One section of the index page generates a "can't find server" error, and the site's own logo won't display properly. It is a free hosting site. Sometimes I can upload files to it, other times I get a can't-find-server error when I try.
In answer to my query about this (to which I helpfully attached a screenshot of the incompletely loaded index page and its error messages), the host is telling me that I should "flush my DNS cache," which they say involves going into Terminal and giving the command "ookupd -flushcache" [sic]. (I've already surfed this briefly and the first result confirmed my suspicion that this doofus hasn't mastered copy-and-paste technique and the command actually should be "lookupd- flushcache".)
It's not just that their site doesn't load fully, though. They have some stuff on one of their pages that they encourage users to hotlink on personal Web sites, and I have done that with one of their banners. The banner, which was fine for months, now appears on my page as a broken icon, too, although it, like the site's home page, loads fine on my computer at work.
My first question is, is there any harm in flushing the DNS cache? The OS Daily page where I think they copied this advice from makes it sound like this is something only a Web server would need. If I do it on my home machine, could it cause problems? Could it disable my Internet connectivity?
Second, less urgent question, more for the netgeeks out there: Do you think this is a likely solution to my problem? Especially considering that the problem involves not only their site but an element on an external site linking back to them? I hate to play the sucker for some low-level geek whose main mission is to deflect my query.
Thanks
Kathi

Kathi--
Like BDAqua says, there's nothing to worry about flushing the DNS cache. It's true that most people probably don't need to do it very often, but it's something easy and harmless to try, and it might well fix problems like yours.
One handy feature of Safari, even if you don't use it for anything else, is the "Activity" window. Open it from the "View" menu, and watch as your page loads. You can see exactly which components on the page are loading, which aren't and where they should be coming from. If you double-click an element in that list, Safari will try to open it in a new window. That is sometimes enough to give a clue as to why something isn't working.
You can use Safari's activity list along with the Network Utility from your Utilities folder to try to figure out why you're not getting the page elements. Suppose a graphic is listed as coming from http://www.server1.com/images/logo.jpg, but it's not loading.
First thing I would try in the Network Utility is to see if it will respond to pings. From that example, enter "www.server1.com" on the "Ping" page of the Network Utility and see if it answers back.
To find out if it's a DNS problem, you can use Safari's list to get the addresses of the problem elements, then see if the IP addresses match up on your computer at home to the one at work. If they don't, then it could be stale DNS.
You can use the Network Utility for DNS lookups, but I think they're hard to read, and, since you're already thinking about using the Terminal to flush the DNS cache, you can use nslookup. It's really simple:
<pre class="command">nslookup www.apple.com</pre>
Will give you something like this (the first two lines will likely be different):
Server: 208.67.222.222
Address: 208.67.222.222#53
Non-authoritative answer:
www.apple.com canonical name = www.apple.com.akadns.net.
Name: www.apple.com.akadns.net
Address: 17.251.200.32
If the addresses don't match, or you get a message that it can't find anything for your server, then you know it's a DNS problem. Perhaps they've changed some addresses and your home ISP's DNS servers themselves aren't updating.
You can even use nslookup to see what different DNS servers say about an address. Just add the IP address of a DNS server after the address you want to look up:
<pre class="command">nslookup www.apple.com 208.67.220.220</pre>
Just do a search on the 'net for free DNS servers, and you'll find a bunch to choose from.
charlie

How can i change the DNS Name of a 10.6 Server

Hello when i installed the Server i made a mistake and put in a wrong dns name wich is not reachable from the clients. How can i Chane the DNS Name?

The core command is changeip, and Google will find some details and discussions.
$ man changeip
$ changeip {-v} {-d path} directory-node old-ip new-ip {old-hostname new-hostname}
It's not always successful; the host name tends to get embedded everywhere.
For the official documentation on this, see the [Advanced Server Management Manual|http://manuals.info.apple.com/enUS/ServerAdminv10.6.pdf] for a discussion of what (else) needs to happen when the IP settings change; see the +Understanding Changes to the Server IP Address or Network Identity+ section.

HT203163 I cannot access iTunes store from my laptop. I could for years but suddenly - no. Have removed all recently installed software. Have uninstalled and re-installed both my anti-virus software and iTunes. Have allowed pop-ups. Have flushed the DNS.

I cannot access iTunes store from my laptop. I could for years but suddenly - no.
Have removed all recently installed software. Have uninstalled and re-installed both my anti-virus software and iTunes.
Have allowed pop-ups.
Have flushed the DNS. Nothing.
Still can't access the store. Please help!

Close your iTunes,
Go to command Prompt -
(Win 7/Vista) - START/ALL PROGRAMS/ACCESSORIES, right mouse click "Command Prompt", choose "Run as Administrator".
(Win XP SP2 n above) - START/ALL PROGRAMS/ACCESSORIES/Command Prompt
In the "Command Prompt" screen, type in
netsh winsock reset
Hit "ENTER" key
Restart your computer.
If you do get a prompt after restart windows to remap LSP, just click NO.
Now launch your iTunes and see if it is working now.
If you are still having these type of problems after trying the winsock reset, refer to this article to identify which software in your system is inserting LSP:
iTunes 10.5 for Windows: May see performance issues and blank iTunes Store
http://support.apple.com/kb/TS4123?viewlocale=en_US

How can I find the dns names ?

those what are made in the control panel...

how can I find the dns names ?That is OS specific thus you must either use Runtime.exec() or use JNI to get to the names.
If you search this forum you will find more specific suggestions on how to get them.

How do you flush the negative cache?

Hi all,
I am working with NetWeaver 2004s SR3 SP14 on SuSE 10 with Oracle. I wrote a custom login module and was trying to get SAP to load it. At first I made some reference mistakes (in provider.xml under the references tab) and it wouldn't load. Then I fixed the reference errors and tried to get it to load again and it still wouldn't load. I just keep on getting the error message:
[EXCEPTION]
{1}#2#com.mycompany.dc.netweaver.MyLoginModule#java.lang.ClassNotFoundException:
com.mycompany.dc.netweaver.MyLoginModule
Found in negative cache
I shut down and restarted SAP several times (using stopsap and startsap) and undeploying and redeploying my login module (the fixed version), but still, SAP refuses to load my login module because it is in the "negative cache".
If I keep the code the same, but change the name of the Java class and component name in provider.xml, then SAP happily loads my login module.
So I can work around the issue, but it is really annoying to change your configuration every time you make a mistake with the references... So I was hoping that someone would know how to flush the negative cache. Do I have to go into the database to do it?
-- Katrina

Hi Katrina,
did you found a way to flush the chache?
kind Regards,
Gerardo J

How does changeip determine the dns hostname?

Hello,
i've been trying to setup my 'test' server at home according to the info i find online.
one of the first parts is setting the hostname. It is recomended that you use something like
server.myowndomain.com
when i use sudo changeip -checkhostname i get
Primary address     = 192.168.xx.xx
Current HostName    = server.myowndomain.com
DNS HostName        = myowndomain.com
To fix the hostname please run changeip for your system with the
appropriate directory with the following values
   /Applications/Server.app/Contents/ServerRoot/usr/sbin/changeip 192.168.xx.xx 192.168.xx.xx server.myowndomain.com myowndomain.com
dirserv:success = "success"
at my external dns control panel there are 2 A records for my domain name
localhost
A
127.0.0.1
server
A
78.xxx.xxx.xxx
when i ping from a remote location i get results for both myowndomain.com and server.myowndomain.com
i had my server working when i used myowndomain.com as hostname, but everywhere i read it says you should use something like server.myowndomain.com as a hostname.
Is there an other tool i can use to check what dns hostname i'm having?
can someone shed some light on this for me please?
thanks
Marco

If you are setting up your server on your LAN, then you need to support what is called split horizon DNS. This means that you need to run a public DNS (which you have based on the ("at my external dns control panel there are 2 A records for my domain name") and you must run DNS on your LAN as well. The reason for this is simple.
When running your server on a LAN behind a firewall, your server has two identities. The first identity is its LAN address. As above, this is something on the 192.168.x.x network. This is a private address range and can not be used for public routing. The second identity is that of the public Internet. As above, this is represented by the 78.x.x.x address that is the public address used by your firewall.
When users on the LAN reference your server, they will need to reference it by the 192.168.x.x address. When users externally want to access it, they will need to route to the 78.x.x.x network. Thus, the need for two DNS entries.
Now, the DNS entries are commonly the same. The difference is the number assigned to the record. For example, server.myowndomain.com will point to 192.168.x.x on your LAN and server.myowndomain.com with point to 78.x.x.x on the WAN.
Other ways to check DNS would be to use nslookup or dig. Also, check the server's network preference panel and look at your DNS entries. The first entry should be a 192.168.x.x address and it should be pointing to a DNS server on your LAN. This could be you server or it could be another device that is already running DNS.
DNS is considered the foundation service for OS X Server. However, it all depends on the services that you are running. For Open Directory, Profile Manager, and others, DNS is critical. Failure to implement it properly will give you nothing but headaches and likely cause future service deployment issues. However, if you are just hosting a bunch of web sites, then DNS is not as critical, especially if the server is deployed on a LAN with no clients.
As a note, if you were running your server with a public address, you could use BIND views. However, this is not advisable for security reasons.
R-
Apple Consultants Network
Apple Professional Services
Author "Mavericks Server – Foundation Services" :: Exclusively available in Apple's iBooks Store

How can I clear the DNS cache?

I haven't been able to connect to my local Library since January. When I key in the URL, it starts the access routine and then after about 20 minutes, I have to kill it because nothing happens. I contacted the IT folks at the library and was told that they had made a few changes around the time my problem began so maybe the DNS cache was still pointing at the old info. He recommended that I enter TERMINAL mode and try to clear the DNS cache, using "sudo dscacheutil -flushcache" command. . I attempted this several times, even changing my applid password, and kept getting invalid responses.

I did try that and after a few trys it finally worked. It took quite awhile for the window for the library to finally come up, but it did and I am now able to get in and out with no problems with my library access. Now when I call up my bank, parts of it don't come up and it kicks me out. Now, I'll have to search for what fixes that - as it has happened before, so I know it's fixable. Thanks for you help though.

How can I override the DNS Servers and Domain Name used by my Airport Time Capsule?

The defaults picked up from my ISP's DHCP are to use the ISP's DNS servers and ISP's domain. I do not want this.
With my prior router I set the DNS servers to Google's Public DNS (8.8.8.8 and 8.8.4.4) and my domain to either "bannister.us" (which I own) or "bannister.home". I do not want simple names resolving to some ISP default. (Yes, I know exactly what this does.)
In the Apple AIrport Utility (version 6.3.2) the fields for DNS and Domain do not allow editing. (Why??)
Is there some way to override this?

Unfortunately not one that will work with the latest version TC.
The way around it is to use a different router.. It can be a very simple router.. I usually recommend units like the TP-Link WDR3600 as they take good third party firmware like gargoyle, openwrt, dd-wrt.. ie they have real controls and beyond that a proper Linux firmware with command line interface.
You can then change the TC over to static IP. It will not be the router.. but it will effectively become the local dhcp server.
I have adsl so I cannot reproduce your system.. I have a bridged modem.. a router.. AC66U.. and a TC.. but the TC is not in bridge.. it is in static IP mode.
Let me demonstrate.
By setting a range on the main router from 1-199 (leave a space.. ) so set the TC to 192.168.2.201 and then you can set DNS and domain as you like. Set the dhcp range (leave a space) you could use 203-253.. then I use the main router as 254.
It is brilliant.. all computers behind the TC receive the IP from the TC with whatever IP and dns (and domain although I haven't changed it).. Effectively the TC works as its own dhcp device.. but is merely a secondary dhcp server to the main unit.
(This gives me netflix which is why I do it.. from well outside the US).
It may be of use.
Why leave a space.. well it helps it to work.. I have not tested it but another person reported issues and found leaving a space .. ie last ip in the router.. 199, static ip 201.. first dhcp 203 (i used 205 to help me keep count!!). worked.. I have not tried to reproduce the problem.. so I reproduce the solution.. it might be like sheep jumping over the fence.. even if the fence was removed the sheep keep jumping over at the same place. Just say bahhh and do likewise.

How do I flush the UDP buffers from within LabVIEW?

In order to more effectively utilize UDP based communications, I would like to flush any previous UDP messages from the O/S buffer so that I can start or re-start my LabVIEW application without any "leftovers" still in the system from a previous run. I would like any pointers on ways to do this. I do not see how to do this with the existing LabVIEW elements.
Thanks.
Steve

Good evening,
I think the issue here is that with a UDP connection the
idea is to create a fast half-duplex connection between a server and a
client. If the client does not have a
socket open, an error is generated and no datagram is buffered. Therefore there should be no “junk” packets
of information in a port buffer to clear.
In addition I believe that the UDP read can never read more than one
packet worth of data – further illustrating that there really is no UDP buffer
that is set up in your OS to clear.
Thanks for posting -- hopefully this helps. Please let us know if anyone has any other
questions!
Regards,
Travis M
Applications Engineer
National Instruments
Travis M
LabVIEW R&D
National Instruments

How do I flush the portlet cache?

I have tried using the portlet cache (renderCacheable="true" ) on some data intensive pages and its working fine. When i make changes to to the data i need to be able to flush that cache though so that the portlets show the updated data.
I have tried to find a way to do this programaticly but so far i havent found any solution. How do i do this?

Create a backingFile on the portlet
and from one of the methods (say handlePostbackData)
call
PortletBackingContext.getBackingContext(request).invalidateCache();
Chris Jolley
Portal Architect

How do I flush the dns?

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