Fix DNS Server Not Responding Error – A Step- by- step guide. This is a complete guide on fixing DNS Server isn’t Responding error. I was just about to post an article on a different topic, but then I noticed that for some reasons, some websites were not opening up. There were no error messages and the web page comes with an option to click on diagnostic tools to find the cause. I confirmed that my internet connection is working fine as I was able to go to google and look for search results. The next step was to open these website with browsers such as IE, Firefox and Chrome. The logic is to check if it as a browser related problem. Computer Configuration Policies Administrative templates Windows Components Remotes Desktop Services Remote desktop Session Host Security Always prompt for password. BSOD crash analysis support, BSOD debugging and error reports and help for Microsoft Windows Operating Systems, driver research,crash dump analysis. Article ID -- Article Title. FD39360 - Technical Note: Fortinet Auto Discovery VPN (ADVPN) FD34371 - Video Library: Tutorials and Guides for Fortinet Products. All my web browsers had the same issue which confirmed, this is not a browser problem. Then I tried the diagnostic tool link that popped up in the webpage, which showed me DNS Server Not Responding Error. After performing some troubleshooting, I was able to fix the issue. Thought I would share it in this article. Reasons for getting DNS Server Not Responding Error. The server which host the website might be temporarily down due to technical reasons. The DNS service in your computer is corrupted or not working. The security firewall or security software itself might have accidentally blocked your PC from communicating with a website or certain websites. How to narrow down the source of DNS server not Responding Error? If you have another computer or mobile device accessing internet from the same network, then check if they are able to access internet. The other mobile device can be a smart phone or tablet. If the other devices have internet connection, then this is an issue with your computer. If the other devices are not able to access internet, don’t waste any time and contact your ISP. Explain them the scenario and they will help. Some ISP technicians are quick to blame your computer for this issue)Try to access internet using safe mode with networking. It is explained below under the section “How to fix DNS Server Not Responding Error because of a corrupted security”. If your computer is able to access internet in safe mode with networking, a security software or conflicting third party software might be responsible for the problem. If you are getting DNS server error only on couple of websites, then it might be a temporary issue with the server which is hosting that website. You can check it using websites like http: //downorisitjustme. Just enter the name of the website that you would like to check. This website will ping to your destination website and let you know if it is up or down. In case if it shows that the website you want is up and running properly, but you are not able to see it, then the problem is with your computer. If the website is shown as down or not working, you need to wait until the webmaster of the website get the issue fixed. Check if the error is a browser problem by browsing websites using different browsers such as IE, Firefox, Chrome, Safari or Opera. This happens rarely, but yet possible. If the error is happening only on a particular browser, then you need to troubleshoot the browser. Following the steps mentioned in IE optimization which fix most issues, no matter which browser you use. Here is how to do a complete Internet explorer optimization. How to fix a DNS Server Not Responding Error Normally. If you haven’t done any troubleshooting yet, try the steps in this order. Reset IP and Winsock. The problem might be as a result of corrupted IP and Winsock. Follow the commands in the order to reset the settings. Open command prompt with Admin privilege.(For Win 1. Start button > click Command Prompt (Admin))(For Win 7 and Win 8, click Start > type cmd inside search window > right click on the result which show command prompt > click Run as administrator)Use the commands in following orderipconfig /flushdnsipconfig /registerdnsnetsh int ip reset c: \resetlog. Restart computer and check if the problem is fixed. Note: Flushdns command is used to flush the DNS database cache, while IP and Winsock command reset these settings. Restart computer and check if the problem is fixed. If not, follow the next step. Do a Power cycle. Sometimes the problem might be as simple as shutting down and turning on modem/ router. Small changes in computer settings or a change in configuration with router or modem settings may result in DNS error. Once the device is restarted most of these changed settings will be cleared. So follow the step. Shut down your computer and also modem/router for a minute or two. Note: It is recommended to turn devices for a minute or two to allow these devices to drain the electrical charge completely which result in a complete reset. Restart both computer and router to check if the DNS problem is fixed. If not, follow the next step. Use Global DNSReplace the DNS server address from ISP with a Global DNS. Global DNS is provided by different private and non- profit organizations. Each server address comes with its own special features which is listed below. Check if the problem is fixed. Changing the Preferred and Alternate error usually fix most of the cases. Here is a list of DNS addresses which can be used on your computer. You will find the Preferred and Alternate DNS addresses with the provider listed in bold. Google DNS gives faster performance. Neustar’s DNS is safe and fast. Comodo’s DNS for extra security. Norton Connect Safe detects pornographic and harmful websites. Ideal for setting on minor’s computer. Free DNS Access to all domains irrespective of regional and censorship issues. DNS Watch is ideal for high performance. Check this article if you notice Windows 1. DNS problems frequently after installing Windows 1. Anniversary Update. How to fix a DNS Server Not Responding Error because of a corrupted security. Security software is another major culprit responsible for DNS Server Not Responding error. Every security software tends to get corrupted over a period of time for reasons ranging from file corruption while updating files, conflicts with other software or indirect changes to security settings as a result of intentional or unintentional changes made on your PC. This might cause the security software to block internet connection. Configure Security Software properly. It is possible that your security software may have got corrupted or not working properly for variety of reasons. Check if your security software is configured properly especially the Firewall settings. A good method to check this is disable all security software and firewall. Then check if the problem is fixed. If not fixed, try one more time by resetting all security software and firewall settings to default. Check the status. Check the internet status in Safe Mode with Networking. Safe mode is a troubleshooting mode that allows only the essential operating system files and drivers to load. All third- party software’s and drivers are prevented from loading. When you select Safe Mode with Networking, apart from the basic OS files and drivers, network driver is also loaded so that you can go online. Once you reach the desktop, try to go online. If the internet works fine, a third- party program installed in your device is responsible for the problem. The logic behind using Safe Mode with Networking – If the internet connection works fine in Safe Mode with Networking, then it should be the third- party services or driver which is responsible for the problem because these are the services which are blocked in Safe Mode with Networking. The major culprits to look for in third party services. Disable or remove security software. Uninstall any recently installed device driver. Uninstall any recently installed software. DNS server not responding showing only for some websites. Sometimes the error message happens to only some websites. Of course, you can check if the website in question is working using www. But what if this is happening on authority websites like Google, Microsoft or Yahoo. You cannot expect these websites to be down and it happens very rarely. The solution mentioned below is simple and it worked very well for me. I apologize for not having any logical explanation to why this error happens only to some websites. You are always welcome to share your opinion on this. Open ncpa. cpl from Start tab. Open network connections. Right click local area connection, then click properties. Select Internet protocol version(TCP/IPv. Select internet protocol ,select “use the following DNS server address”change DNS server address to global DNS value given below. Preferred DNS Sever 2. Virtual Delivery Agent (VDA) 7. Carl Stalhood. Navigation? = Recently Updated. Hardware. If v. Sphere 6, don’t use hardware version 1. NVIDIA GRID. VMware 2. Video playback performance issue with hardware version 1. VMs in 2. D mode. For virtual desktops, give the virtual machine: 2+ v. CPU and 2+ GB of RAMFor Windows 2. R2 RDSH, give the virtual machine 4 v. CPU and 1. 2- 2. 4 GB of RAMFor Windows 2. R2 RDSH, give the virtual machine 8 v. CPU, and 2. 4- 4. GB of RAMRemove the floppy drive. Remove any serial or LPT ports. If v. Sphere. To reduce disk space, reserve memory. Memory reservations reduce or eliminate the virtual machine . The NIC should be VMXNET3. If this VDA will boot from Provisioning Services. Give the VDA extra RAM for caching. Do not enable Memory Hot Plug. For v. Sphere, the NIC must be VMXNET3. For v. Sphere, configure the CD- ROM to boot from IDE instead of SATA. SATA comes with VM hardware version 1. SATA won’t work with Pv. S. Install the latest version of drivers (e. VMware Tools). If Windows 7 on v. Sphere, don’t install the VMware SVGA driver. For more details, see CTX2. Intermittent Connection Failures/Black Screen Issues When Connecting from Multi- Monitor Client Machines to Windows 7 VDA with VDA 7. Sphere/ESXi. If v. Sphere, disable NIC Hotplug. Users could use the systray icon to Eject the Ethernet Controller. Obviously this is bad. To disable this functionality, power off the virtual machine. Once powered off, right- click the virtual machine and click Edit. Settings. On the VM Options tab, expand Advanced and then click Edit Configuration. Click Add. Row. On the left, enter devices. On the right, enter false. Then click OK a couple times to close the windows. The VM can then be powered on. Windows Preparation. If RDSH, disable IE Enhanced Security Config. Optionally, go to Action Center (Windows 8. R2) or Security and Maintenance (Windows 1. User Account Control and enable Smart. Screen . Run Windows Update. If Windows Firewall is enabled. Enable File Sharing so you can access the VDA remotely using SMBEnable COM+ Network Access and the three Remote Event Log rules so you can remotely manage the VDA. Add your Citrix Administrators group to the local Administrators group on the VDA. The Remote Desktop Services “Prompt for Password” policy prevents Single Sign- on to the Virtual Delivery Agent. Check registry key HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services. If f. Prompt. For. Password = 1 then you need to fix group policy. The following GPO setting will prevent Single Sign- on from working. Computer Configuration Policies Administrative templates Windows Components Remotes Desktop Services Remote desktop Session Host Security Always prompt for password upon connection. Or set the registry value HKEY_LOCAL_MACHINE\SOFTWARE\Citrix\Portica. Auto. Logon (DWORD) = 0x. For Windows 7 VDAs that will use Personal v. Disk, install Microsoft hotfix 2. A computer stops responding because of a deadlock situation in the Mountmgr. This hotfix solved a Personal v. Disk Image update issue detailed at Citrix Discussions. If this VDA is Windows Server 2. R2, request and install the Windows hotfixes recommended by Citrix CTX1. Scroll down to see the list of recommended Microsoft hotfixes for Windows Server 2. R2. Ignore the Xen. App 6. x portions of the article. Also see http: //www. To remove the built- in apps in Windows 1. Robin Hobo How to remove built- in apps in Windows 1. Enterprise. For Remote Assistance in Citrix Director, configure the GPO setting Computer Configuration | Policies | Administrative Templates | System | Remote Assistance | Offer Remote Assistance. See Jason Samuel – How to setup Citrix Director Shadowing with Remote Assistance using Group Policy for more details. If you intend to use Citrix’s SCOM Management Packs for Xen. App/Xen. Desktop, make sure Win. RM is enabled on the VDA by running winrm quickconfig. Install Virtual Delivery Agent 7. For virtual desktops, make sure you are logged into the console. The VDA won’t install if you are connected using RDP. Make sure 8. 3 file name generation is not disabled. If so, see CTX1. 31. User Cannot Launch Application in Seamless Mode to fix the App. Init_DLLs registry keys. Make sure . NET Framework 4. CLI Install: Command Line Install Options are detailed at Install using the command line at Citrix Docs. The Citrix Telemetry Service seems to cause problems. You can use the Command Line Installer to exclude Telemetry Service as detailed at VDA upgrade cmdlet at Citrix Discussions. Xen. Desktop. VDASetup. Enable_HDX_PORTS /enable_framehawk_port /Enable_REAL_TIME_TRANSPORT /optimize /controllers "xdc. Exclude "Citrix Telemetry Service"GUI Install: Go to the downloaded Xen. Desktop 7. 9 (Xen. Desktop Platinum, Xen. Desktop Enterprise, Xen. App Platinum, or Xen. App Enterprise) . Auto. Select. exe. Alternatively, you can download the standalone VDA package and run that instead. Click Start next to either Xen. App or Xen. Desktop. The only difference is the product name displayed in the installation wizard. Click Virtual Delivery Agent for Windows Desktop OS or Windows Server OS depending on which type of VDA you are building. In the Environment page, select Create a Master Image and click Next. For virtual desktops, in the HDX 3. D Pro page, click Next. In the Core Components page, if you don’t need Citrix Receiver installed on your VDA then uncheck the box. Click Next. In the Delivery Controller page, select Do it manually. Enter the FQDN of each Controller. Click Test connection. And then make sure you click Add. Click Next when done. In the Features page, click Next. If this is a virtual desktop, you can leave Personal v. Disk unchecked now and enable it later. In the Firewall page, click Next. In the Summary page, click Install. For RDSH, click Close when you are prompted to restart. After the machine reboots twice, login and installation will continue. Note: NT SERVICE\Citrix. Telemetry. Service needs permission to login as a service. In the Call Home page, click Connect, enter your My. Citrix credentials, and then click Next. In the Finish page, click Finish to restart the machine again. If 8. 3 file name generation is disabled, see CTX1. User Cannot Launch Application in Seamless Mode to fix the App. Init_DLLs registry keys. Citrix Group Policy Logon Delay Workaround. Citrix Discussions Xenapp 7. Wait for local session manager: “I have a Xenapp 7. Windows 2. 01. 2 R2. When logging in through Citrix I got message “Wait for local session manager” for 2. When logging in to the server with RDS, I do not have to wait for this.”“Add the following 2 registry keys to your 7. VDA server – then try connecting to it using ICA to see if the issue still occurs: Add reg keys in “HKLM\SOFTWARE\Citrix\Group. Policy”Dword: “Cache. Gpo. Expire. In. Hours” – Value = 5- 2. Hours) ***start with value of 5***Dword: “Gpo. Cache. Enabled” – Value = 1. Restart the machine after adding these registry keys and attempt an ICA connection (at least twice) to see if that helps the Login delay.”Controller Registration Port. Some environments will not accept the default port 8. Virtual Delivery Agent registration. To change the port, do the following on the Virtual Delivery Agent: Open Programs and Features. Find Citrix Virtual Delivery Agent and click Change. Click Customize Virtual Delivery Agent Settings. Edit the Delivery Controllers and click Next. On the Configure Delivery Controller page, change the port number and click Next. In the Summary page, click Reconfigure. In the Finish Reconfiguration page, click Finish. You must also change the VDA registration port on the Controllers by running Broker. Service. exe /VDAPort. Controller Registration – Verify. If you restart the Virtual Delivery Agent machine or restart the Citrix Desktop Service…In Windows Logs Application log, you should see an event 1. Citrix Desktop Service saying that it successfully registered with a controller. If you don’t see this then you’ll need to fix the List. Of. DDCs registry key. You can also run Citrix’s Health Assistant on the VDA. Profile Management 5. Warning: If you are upgrading and have existing Windows 2. R2 profiles based on the ! CTX_OSNAME! variable, see http: //discussions. Go to the downloaded Profile Management 5. In the Welcome to the Citrix Profile Management Setup Wizard page, click Next. In the End- User License Agreement page, check the box next to I accept the terms in the License Agreement and click Next. In the Destination Folder page, click Next.
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