Repeated DNS Lookup Failures?
Nov 8, 2012
My netbook keeps getting DNS Lookup Failure messages. This happens about every 20 minutes, give or take, though sometimes it can go longer before the failure. I can "solve" the problem by quickly repairing the network connection, but that's tedious. It happens only on my laptop and not on my housemate's desktop (wired connection) though he did say that it happens to him on his laptop as well. In looking around I thought the problem might be because i'm using Chrome, but it happens on Firefox and Opera as well.
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May 14, 2012
For more than 6 months I have been happily using a Sierra Wireless AirCard313U to connect my Win7 Pro (64-bit x86) laptop to the internet, and using another corporation's VPN (Citrix Access Gateway) as a contractor - so networking problems ARE my problem.
Now what happens is: DNS failures halt my internet browsing and any hope of RDP'ing into the corporate LAN whenever I connect to the VPN while using the AirCard (its a USB/cell modem device). The DNS lookups and RDP'ing works fine when I'm using the VPN with my wifi.
What changed recently:Installed Connectify software Uninstalled Connectify software (didn't work w/AirCard) Installed VirtualRouter software Uninstalled VirtualRouter software (didn't work w/AirCard) Installed Sierra Wireless' AirCard Watcher software (manager app, may have included updated drivers for the AirCard) Re-install Connectify software (now worked w/AirCard)Uninstalled Connectify software (DNS problem had appeared)
I've tried removing ISATAPs, running these commands & rebooting, to no avail:netsh int ipv4 reset reset.log netsh int ipv6 reset reset.log netsh winsock reset catalog
Right now, connected to VPN via wifi my ipconfig /all looks like this:
Windows IP Configuration
Host Name . . . . . . . . . . . . : W7
Primary Dns Suffix . . . . . . . :
[Code].....
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Aug 20, 2011
i have problem in connecting internet.Repeatedly it is disconnected from internet gateway.
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Mar 1, 2012
This all started 3 weeks ago, the internet started randomly dropping out between every 10 -20 minutes for 5 seconds, then it would reconnect. This is happening on multiple computers in the same house.
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Nov 11, 2011
We are relocating lms on same server from c to e: drive, with new installation on e:drive Successfully uninstall LMS from c: drive with clean_system. Exe. I have done fresh installation of LMS 3.2.1, installation has been 100% successful, after installation Iam trying to restore database which was backed from exactly same version of LMS. Database restore has been 100% successful for 7 hours, till the point that iam start seeing below message in restore backup.log and also same message in cmd as well.
1. restorebackup seems to loop at the point of restoring RME database.
---
The untar for the tar file E:CAPCIS~1 empBackupData
mengfilebackup.tar is still locking the directory [E:CAPCIS~1 empBackupData
meng]. May be the file content is huge, and its taking more time. It is recommended to type (y) and continue restore.
Do you want to continue the restore (y) or quit the restore (n) [y/n][Sat Nov 12 02:05:24 2011]
[Sat Nov 12 02:05:24 2011]
[code]....
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Feb 26, 2013
I have an RV110, and I'm interested in extending the WiFi range using its WDS feature.The RV110W data sheet simply states.. "allows wireless signals to be repeated by up to 3 compatible devices",Where can I find these "compatible devices", and has anyone had any success using WDS with any APs from the SMB product line?
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Apr 24, 2012
Our detail is "RV042 V03" and using 2 bridge mode modem.
After i upgraded a new firmware v4.1.1.01-sp (Dec 6 2011 20:03:18) , i got many problems in NSD. Both of Modem always hang 5-6 times a day. And today, i just saw the log line :
Apr 26 03:31:16 2012 Kernel last message repeated 2 times. ( It takes around 5-6 times per hour)..
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Feb 16, 2013
Region : Poland
Model : TD-W8951ND
Hardware Version : V5
Firmware Version : 5.0.0 Build 120522 Rel.23978
ISP : Orange/TPSA
On my router TD-W8951ND constantly there are the same type errors, while using computer conected to the router:
Code:
2/16/2013 17:24:8> netMakeChannDial: err=-3000 rn_p=80544b08
2/16/2013 17:24:13> Last errorlog repeat 2 Times
[Code].....
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Mar 11, 2013
I been having trouble with my pc ... it looks like it wants to load the page and takes forever and then it says DNS lookup failed ... sometimes it loads but I have to keep trying until it does load.. It's a Windows XP
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Jul 7, 2011
whenever I start downloading any large file I start getting DNS lookup errors from Chrome. I can still download the file and even connect using TeamViewer so I am still connected to the internet is some fashion. My roomate is connected to the same network wirelessly and has not had the issue yet. I am currently connect directly to the router which a Belkin.
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Jan 4, 2013
I want to find out what machine a user is logged into on a local network. The syntax should be something like :lookup user@domain dns.just not sure what flags to pass?
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Sep 26, 2012
So I just got a new Acer ultrabook and it was working fine until a few days ago. It keeps saying the DNS lookup failed. I've tried everything I can. I made sure it wasn't chrome, doesn't work in Firefox. Reset the modem, did a DNS dump, set the DNS to a 888thing. Utorrent is connecting to the internet fine and I can connect for random periods of time. If I do trouble shoot over and over eventually it starts working. Everyone else in my house gets internet even my sister with the same computer and model.
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Oct 24, 2011
dns lookup failed, on all web browser (IE, Google, Firefox). I did ip and winsock reset, did networking ins safe mode, it will ping my ip address but will not ping any other address. My computer (running Vista home premium) says that I have internet access but it does not work. This happened on one computer and then on another one about 6 days later and they both are wired to a router.
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May 18, 2011
My internet connect works fine for hours at a time, then suddenly will get 7 or 8 General Failures while pinging (long enough to boot me off the net) then will be back to working fine immediately afterwards.Pinging 127.0.0.1 works fine. I've checked the firewall (Norton) and it has the default settings
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Oct 13, 2011
My WLAN has been working fine for the past 6 months. Recently it started connecting and disconnecting itself. ANd now it will only connect to the network but wont give internet access. I can connect to the same router using an ethernet cord. And I can connect to the wireless network using my phone or other computer. There are no driver updates for my network adapter, and I tried reconfiguring the router. That worked for a short period of time, but now I have the same issue. I tried a system restore back to before a recent virus software update to see if maybe that update was causing the firewall to block something.
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Aug 28, 2011
whenever i open chrome or anything i get DNS Lookup failed.
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Feb 15, 2013
Well first of all id say im pretty good at these types of things as they have happened to me so many times. But i cant figure this one out. Yesterday my internet just went out. All of the lights on the modem are still on everything says it should be connected but just doesnt work. When i try to open webpages it says DNS Lookup failed. Called tech support they are sending me a new modem atm, but i have 2 other ones around that i have tried and they say that im connected to the internet, but nothing same lookup error and everything so i do not think it is the modem. Flushed dns, manually entered the isps dns , Dont know what else to try at all.
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Jun 3, 2011
Iv had this problem with two wireless repeaters now. when im connected to just the router, i am able to access the internet. however when i plug in and set up the wireless repeater ( the latest one is a amped wireless sr300) it works for a few min and then i get a "DNS lookup failed" when trying to access sites. this repeater replaced a hawking hwren1. which would work for a few min and then lose the network.i believe this is a problem with our internet connection into the house, but could it be a caused by the router? (wrt400n) our isp says its not their problem and that its our router, but this is the 4th one in under a year.
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Dec 20, 2011
I have a Windows XP laptop and a Windows 7 desktop. The desktop has no wifi support, I had built it myself. To get internet on my desktop (used for games), I had connected my laptop to the pc, and the laptop picked up wifi from my AT&T gateway in another part of the house. ( I can't move the gateway currently) I have been wanting to connect the desktop to a router/repeater/bridge that would pick up my gateway signal, therefore eliminating the use of the laptop. I also have an Xbox right next to the pc, so I din't want to get an adapter because then I would have to purchase two, so I picked up a a wireless n router with 4 ethernet ports. ( then I could connect both systems using 2 ethernet cables) [URL] I knew when purchasing the router that it had repeater/bridge support. Currently, I have it configured as a wifi bridge. I can connect to it via my laptop, on the wireless networks page, it shows my gateway signal, and the bridge/router, so I connect to the router. It says I have excellent connection, but I can't connect to the internet? Using Google Chrome, it says DNS lookup failed. I can't get on any website, only the router's config page, which is 192.168.1.1. I also connected the router to my pc, and when troubleshooting it says DNS server not responding, may be non existant or incorrect?
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Apr 19, 2012
I manage a small business with 10 computers running off my network. They are all connected to the internet through a RV016. We recently created a new website and purchased a new domain through In Motion Hosting. I have a randomly reoccuring issue, usually in the morning, that seems to resolve itself after a couple hours on it's own. I have dealt with tech support from In Motion Hosting and my ISP who have both come to the determination that the problem lies within my gateway.
When I attempt to log on to my companies website [URL] my browser is unable to locate the webpage. Also, if I try to access the website for In Motion Hosting [URL] or to access our webmail [URL]I am unable to do so because the DNS lookup failed. I can view any other web page on the internet without a problem. I can not ping or tracert either website successfully, however when I called In Motion Hosting and got the IP addresses for the two I was able to ping and tracert them without a problem.
As I said the problem happens randomly and seems to resolve itself within 2-8 hours. However we are unable to access our email during these "blackouts" which is becoming a huge problem.
Is there a setting within the RV016 that might be causing this to happen?
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Sep 23, 2011
I made a custom-built V1 Windows Home Server that I really would like to be able to remote access. I have tried the Netgear 3700, but it did not allow remote access. A D-Link DIR-825 does, but it, and many D-Link products, have a persistent problem of requiring a reset due to dropped connections. I have had 2 of the DIR-825's drop connections. I have been told that their QoS components cannot handle the load on them and fail, causing the drops, but I cannot corroborate that.Perhaps what I need is a router that allows "NAT loopback"? This way I can see the WHS Console verify that I can access the server from outside my network. I have tried to do so with the above routers via a 3G connection on my iPhone 4 and all except the D-Link failed to allow access to my WHS.
I should add that I am using a D-Link DSL-520B modem on ATT DSL. It is a 6MB connection from the ISP. Previously the modem was in "bridge mode" on the D-Link router. Also, contacting ATT I was told they do not block any ports. I have tried forwarding the proper ports (80, 443, 4125) for the WHS, but that has not given me remote access. I did get them by enabling UPnP on the D-Link. Is all this an issue of needing the modem on "bridge mode" in order to work properly? Any router for my needs that allows remote access (NAT loopback needed?) and also has a solid connection? Gigabit ethernet is a must have too. Otherwise I am open to options. I would like a combined router/modem unit to make things a little easier.
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Apr 28, 2012
does a spanned drive have any protection against disk failures?
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May 8, 2011
I have over 20 units doing the same thing and it seems to be a software isssue but i dont see any bugs or posts on it. This is only on 2960S switches and not 2960 or 2960G units.
If i use the password reset feature to break the units into rom and then type "boot" instead of power cycling the unit, they will fail MBIST post tests. If the unit is power cycled or left to boot normally on its own, there is no issues and all post tests pass. I know MBIST is Memory Built In Self Test and was thinking maybe breaking the unit into rom disrupts those memory tests for some reason. I tried the following software and got the same results with all of the images:
122-55.SE2
122-55.SE
122-53.SE2
122-53.SE1
Logs attached are from the same switch, one with password reset procedure used and while left to boot on its own.
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Dec 31, 2012
Whenever I try to goto a webpage within any browser,despite me being connected to my network(though 1 received packet to every 20 or so sent packet ratio) it tells me that DNS lookup failed. I had a similar issue on my other pc that I use more often,though connecting through WIFI momentarily resolved the issue,before I returning to wired,where everything has been fine. My other pc however has no wifi adapter. So ive been stuck.
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Apr 21, 2011
I was thrown into trying to fix a friends pc being told that the internet wasn't working.What I've found through some messing around is that I am able to pull up websites with the ip address but trying to use the domain name give a "Host Not Found". Similar error when trying to do a ping. However doing an nslookup will pull the ip's for a domain. I've done the dns flush, the netsh commands that are floating around to no avail.
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Jan 20, 2011
In each case, the routers have functioned flawlessly for a period of 2 to 8 months, then suddenly begin to require daily to hourly reboots to keep the speed up, and often times fail to respond to any web activity whatsoever. Ping tests are intermittent, sometimes failing but other times succeeding while web sites remain unresponsiveFor three years I lived with two or more room mates at a time, each of us with our own computer (or 2) and all doing a lot of peer to peer downloading. I realize a router can overheat during heavy use like this, so buying new routers so regularly has seemed vaguely understandable. However it doesn't seem like that is the case in my most recent failure.I've lived alone for the past 3 months, and have owned the Belkin Play Max N600 HD since. I have NOT been P2P downloading or putting a heavy load on my router in any way (or so it seems). Yet as of about two weeks ago, it has suffered a major slowdown just like all of its predecessors. Yet my 30 mbps internet connection roars to life the moment I plug the modem directly into a computer.
My desktop remains on 24/7 but like I said before, I do not do constantdownloading/uploading. Both wired and wireless connections are effected equally, and I have always kept all my routers WPA encrypted.When websites become unresponsive on my Belkin today, it is usually after everything has been sitting idle for some time (overnight, or all day while I am at work). Speaking of work, today is a perfect exampleI remoted into my home desktop and was able to interact just fine, yet when I would launch a browser and try to load any website at all, I get absolutely nothing. I had to transfer a text document through DropBox (which also still worked) because I couldn't get Google Docs (or gmail) to load on the remote computer
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May 23, 2012
C3745-ENTSERVICESK9-M version 12.4(10b). ROM version 12.2(8r)T2.This router appears to be generating spurious fan failure alarms. The fan assembly has been changed for a new one, the engineer checked and was satisfied that in a physical functional sense the replacement fan assembly was definitely working, but we now have all 4 fans showing as failed. We are being told that the replacement unit is believed to be part of a batch of faulty fan assemblies and that it was a known Cisco issue.
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Apr 25, 2013
I have a site to site ipsec tunnel setup between an ASA5510 and a 2951 Router. The ASA 5510 is on a 10.x subnet with a few vlans behind it. There are also 7 other ASA5505 that connect to this box with ipsec.
The 2951 is on a 10.x subnet with multiple vlans behind it (10.x and 192.x subnets).
When I had ACL to allow traffic from 10.20.0.0 (ASA) to 192.168.111.0 (2951 - voice vlan) the connection comes online and is stable.
The minute I add any of the following, the connection drops off with Phase 2 errors: 10.20.0.0 to 10.1.200.0 10.20.1.0 to 10.1.1.0
I can add a second 10.20.0.0 to 192.168.10.0 with no problem at all. The issue only seems to occur when attempting to add traffic from 10 to 10 on the tunnel.
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May 11, 2011
I manage a VPN 300 concentrator which has been happily working for several years without any problems. All users are part of the same group and authenticate to an RSA server. We recently moved from RSA authentication manager 6.1 to RSA authentication manager 7.1. Everthing continued working fine for several weeks, then at the beginning of this week we started getting users intermittently failing to connect to the VPN. I'm not sure if this problem relates to our new RSA server, but we have other network devices which authenticate to it with no problem so I guess the problem is with the VPN concentrator itself.
When users fail they just get a generic "Reason 427 connection terminated by peer" error message. The live event log shows "group = vpn, status = Not-in-service" when their connection fails. Other times they connect normally and no error messages are displayed. There seems to be no real pattern, sometimes your connection fails but if you keep trying you will eventually get in [however it can take many attempts over an hour or two before you succeed, or you may get in straight away with no problem].
I dont believe its a network problem, as I have run continuous pings to the concentrator and the RSA server whilst users are experiencing these problems and there are no drops.
The RSA servers authentication monitor always shows that the user has successfully authenticated, whether the users connection actually succeeds or not. I am tempted to just reboot the concentrator, but we have site-to-site VPN tunnels connected off it and I'm a little concerned that if it is faulty it may not come back up at all.
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Jun 7, 2012
I'm looking for a way to monitor client authentication failures with our 3 standalone 1142N APs. I know that I can see failures under the log viewer of each AP
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May 23, 2012
After upgrade from ACE20 with A2(3.5) to ACE30 with A5(1.2) I get failures in a number of server farm's, where before upgrade the number was zero. No drops in VIP and logs from applications do not notice any new errors.
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Oct 17, 2012
I have a 2851 and a 1841 both serving as hub routers in a GRE multipoint configuration. They are both receiving buffer misses and failures on startup. I will post the output of show buffers below:
LAB-HUB-RTR#show buffers
Buffer elements:
607 in free list (500 max allowed)
9071 hits, 0 misses, 618 created
Public buffer pools:
Small buffers, 104 bytes (total 71, permanent 50, peak 71 @ 00:11:33):
68 in free list (20 min, 150 max allowed)
7083 hits, 74 misses, 0 trims, 21 created
55 failures (0 no memory)
[code]....
I have tried increasing the small/medium buffers initial size and permanent size, however there is no change. The buffer failures for small and medium buffers are always around this many every boot.I have also changed the IOS versions between 12.4.24(T4) to 15.1 with no luck in stopping the failures.
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Jun 20, 2011
I have just gone through hours of tech support with my ISP and still cannot seem to get online. Problem is the same as recent posts by jerguy1928, with message "DNS lookup failed...." coming up in Google Chrome. Both IE and FF just say cannot connect.Running Windows 7 on laptop. I have tried alt DNS settings (Google and others), all the CMD suggestions, disabling firewalls etc, etc! Other computer in house connects just fine.Ping works fine. Really, there appears to be no reason to not be able to connect - since I am actually connected!
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