Windows 2k/XP - More Tweaks. You can find our main Windows 2000/XP tweaks and patches here: Windows 2k/XP Registry Tweaks. On this page, you will find additional tips and tweaks for improving your network performance and broadband experience with Windows 2k/XP. Tweak DNS Errors Caching in Windows. All current Windows versions starting with Windows 2000 have built-in DNS (Domain Name System) caching, which basically caches resolved hostnames for faster access and reduced DNS lookups. This is generally a great feature, with the only downside that failed DNS lookups get cached by default as well. When a DNS lookup fails (due to temporary DNS problems), Windows still caches the unsuccessful DNS query, and in turn fails to connect to a host regardless of the fact that the DNS server might be able to handle your lookup seconds later.
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There are a couple of different ways to tweak Windows not to cache failed DNS lookups:. 1. You can flush the DNS cache manually, by going to Command Prompt and typing: ipconfig /flushdns. 2.
You can wait for the cached lookup to expire or reboot the system. Or you can permanently solve this issue by tweaking a few Registry entries. You can simply use the patch below to modify your Registry:. winxp_dnscache. zip - patches for Windows 2000 and Windows XP not to cache failed DNS entries. To install, save to your HD and double-click the filename for your OS.
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Use the XP patch for Windows 2003 server. winxp_dnscache_undo. inf - patch to reverse all changes made by both the Windows 2000 and XP/2003 patches above. To install, save to your HD, then right-click on the filename and chose "install" from the pull-down menu. If you'd rather do the changes manually, and assuming you feel comfortable editing the Windows Registry, here are the related Registry entries (recommended values are highlighted in red):. [HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesDnscacheParameters].
MaxNegativeCacheTtl=0 (DWORD, default value: 0x12C (300 seconds), range: 0x0�0xFFFFFFFF seconds) Description: Determines how long an entry recording a negative answer to a query remains in the DNS cache. When the time specified in the value of this entry expires, the DNS client deletes the answer record from cache. This is a Windows XP and 2003 Server setting only, the Windows 2000 equivalent is NegativeCacheTime.
NegativeCacheTime=0 (DWORD, default value: 0x12C (300 seconds), range: 0x0�0xFFFFFFFF seconds) Description: Determines how long an entry recording a negative answer to a query remains in the DNS cache. When the time specified in the value of this entry expires, the DNS client deletes the answer record from cache. This is a Windows 2000/2008/Vista/Windows 7 setting, for Windows XP/2003 please use MaxNegativeCacheTtl instead. NetFailureCacheTime=0 (DWORD, default value: 0x1E (30 seconds), range: 0x0�0xFFFFFFFF seconds) Description: Determines for how long the DNS client stops sending queries when it suspects that the network is down. When the DNS client does not receive responses to repeated queries sent to any network adapter, the DNS client stops sending queries for the time specified in the value of this entry. During that time, the DNS client returns a timeout response to all queries. If the value of this entry is 0x0, this optimizing feature is disabled.
DNS continues to send queries to an unresponsive network. NegativeSOACacheTime=0 (DWORD. default value: 0x78 (120 secnds), range: 0x0�0xFFFFFFFF seconds) Description: Determines how long an entry recording a negative answer to a query for an SOA (Start of Authority) record remains in the Domain Name System (DNS ) cache. When the time specified in the value expires, the DNS client deletes the answer record from the cache.
Note: As always when editing the Registry, a backup is a good idea, and reboot might be required for changes to take effect. Related Articles:. The following tweak applies only to Windows XP Professional edition (and other Windows versions that may have QoS Policy installed). The default system behavior is that all 100% bandwidth is available, however, if there is a running application that indicates to the OS it needs to send high priority/real time data, then as long as it has the socket open, Windows XP will restrict "best effort" traffic to 80% of the bandwidth so that high priority traffic can be accommodated. Basically, applications can make this request to the operating system for QoS support using the QoS application programming interfaces (APIs) in Windows and this only applies if a specific app is requesting QoS.
If you'd like to change how much bandwidth is reserved for QoS (the default is 20% of the total bandwidth ), do the following:. 1.
Make sure you're logged in as "Administrator" (not just any account with admin privileges). 2. Navigate to START>Run and type: gpedit. msc. 3.
Navigate to Local Computer Policy > Administrative Templates > Network > QOS Packet Scheduler. 4. In the right window, double-click the limit reservable bandwidth setting.
5. On the setting tab, check the enabled setting.
6. Where it says "Bandwidth limit %", change it to read 0 (or whatever percentage you want to reserve for high priority QoS data). 7. Click OK, close gpedit. msc. Under START > My Computer > My Network Connections > View Network Connections. right-click on your connection and under Properties (where it lists your protocols), make sure QOS Packet Scheduler is enabled.
Alternate Method (Windows Registry). Instead of editing the group policy, one can edit the Windows Registry directly:. HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindowsPsched. NonBestEffortLimit=0 (DWORD, not present in the registry by default.
Recommended: 0. possible values between 0 and 100) - indicates the percentage value of reserved bandwidth for QoS applications. Set to 0 to disable. Notes: This tweak applies only to Windows versions that have Qos Packet Scheduler enabled. You need to reboot for changes to take effect.
The Windows Vista registry location is the same as Windows XP.