iis6.0 cannot find server or DNS error and site cannot open solution

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A server or DNS error was not found.

Ping can ping, Telnet 80 port also no problem. Look at the Httperror under LogFiles and find a lot of "36_connections_refused" error messages.

Baidu searched the next "_connections_refused" to find the official Microsoft Solution, HTTP://SUPPORT.MICROSOFT.COM/KB/934878/ZH-CN solution is as follows:
1. Enter the registration form, enter the specific item: Hkey_local_machinesystemcurrentcontrolsetserviceshttpparameters
2. New DWORD value, enter name "Enableaggressivememoryusage"
3. The modified value is 1.
4. Start-run, enter CMD. Enter the cmd window.
5. Execution: net stop http/y
6. Implementation: Iisreset/restart
IIS issues are resolved.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems may occur if the registry is improperly modified. Therefore, make sure that you follow these steps carefully. The additional protection is modified before the registry is backed up. You can then restore the registry when a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 (http://support.microsoft.com/kb/322756/) How to back up and restore in the Windows registry

To work around this problem, add the Enableaggressivememoryusage registry key to the following registry subkey:
Hkey_local_machinesystemcurrentcontrolsetserviceshttpparameters
Then, set the Enableaggressivememoryusage registry key to 1

To do this, follow these steps:
Click Start to click in the Registry Editor to type in the Open box in the run, and then click OK
Click the following registry subkey:
Hkey_local_machinesystemcurrentcontrolsetserviceshttpparameters
On the edit point to the menu new, and then click Two-byte values
Type Enableaggressivememoryusage, and then press ENTER.
Click on the Edit menu to modify
Type 1 in the Value data box, and then click OK
Click the file on the menu to exit the Registry Editor.
Restart the HTTP service. To perform this action, follow these steps:
Click Start, click Run, type cmd in the Open box, and then click OK.
At the command prompt, type net stop http/y, and then press ENTER.
Type Iisreset/restart at the command prompt, and then press ENTER.