几大服务不可用几大原因（Service Unavailable几大原因）（Several reasons for the unavailability of services (Service, Unavailable, several major reasons)）

服务不可用几大原因Service Unavailable几大原因 Severalreasons for the unavailability of services (Service,

Unavailable, several major reasons) 

Service Unavailable for several reasons:

Reason 1: the site exceeds the number of IIS connectionsSolution 1 : increase the number of IIS connections

Note 1 : the Windows 2003 operating system prompts IIS for toolong, not as prompted by the Win2000 systemas "too many links",but rather "Service Unavailable""

Reason two: the site exceeds the IIS resource limit

Solution two: increase the resources of the website

Note two: inWinodws2003, the site takes more than IIS to limitthe systemresources of the site, and directly prompts "ServiceUnavailabl e""

Reason three: the site of the program too much error

Solution three: modify program errors

Note three: Winodws2003 website too many mistakes, it willcause the site where the application pool is wrong, this timeyou can see the application pool'xxx' is automatically disabledin theWindows2003 log, the reason is a series of mistakes "forthe application pool to provide services in the process, this

The above three reasons caused by "Service Unavailable", thegeneral phenomenon is the emergence of "Service Unavailable",after more than a few times to refresh, you can open.Fourth Service Unavailable situation, just installed IISappeared Service, Unavailable, are not in those three kinds ofinside, so on the server view solution.

Because of the new IIS server, in general, the problem can notbe in the IIS itself, the emergence of such problems, generallyfrom the permissions to consider, first consider the IISservice startup account, there is no authority to start IIS.Click "start", "Settings", "control panel" - "managementtools" - "service", open the local service manager, IIS Adminfound Service, double-click to open the IISADMIN attribute,select the "landing" tab display login identity for the localsystem account, the IISADMIN services have no access problems.Click "start", "Settings", "control panel" - "managementtools" - "service", open the local service manager, World WideWeb Publishing find Service, double-click to openW3SVC serviceattributes, select the "landing" tab, landing a display for thelocal system account, the W3SVC services have no accessproblems. Here, in order to make it easier to operate, theservice operation is re - opened

From here you can exclude the service startup account withoutpermission to start, and go back to the ultimate solution.

Phenomenon: click "start", "Settings", "control panel" -"management tools" -- "event viewer, open event viewer, clickthe" system", see a lot of warnings and errors, mainly are thefollowing:

1) is the source of "W3SVC", ID "1002" error description is"application pool'DefaultAppPool' is automatically disabled,because of a series of errors for the application pool toprovide services in the process of. "

2) the source is "W3SVC" and the event ID is "1009", a warningthat the process that provides service for the applicationpool'DefaultAppPool'terminates unexpectedly. The process IDis' 1756' . The process exit code is'0xffffffff' . "

3) is the source of "DCOM", ID "10016" error description is"application specific permission settings to the COM serverappl ication (CLSID {A9E69610-B80D-11D0-B9B9-00A0C922E750} )local activation of the NT AUTHORITY\NETWORK SERVICE SID grant(S-1-5-20) . You can modify this security authority using thecomponent services management tool. "

Analysis: the determination should be third ID "10016" DCOMerror caused event ID 1009 application pool accident exitthrough these events, causing the event ID 1002 applicationpool is automatically disabled W3SVC error,

Here' s the solution.

Problem determination: DCOM error prompted because NETWORK

SERVICE user does not have permission to start

{A9E69610-B80D-11D0-B9B9-00A0C922E750} ,

Found the reason, the following to solve this problemFirst find the corresponding

CLSID{A9E69610-B80D-11D0-B9B9-00A0C922E750} service, clickthe"start"-"run", type"regedit" to start the registry editor,select the "my computer" in theregistry editor on the left sideof the tree, and thenuse the shortcut key "Ctrl+F" to open thesearch dialog box, enter the CLSID just in the "find":"{A9E69610-B80D-11D0-B9B9-00A0C922E750}" "check box, see"keep only "items", enter search task.

Tofind theCLSID in theregistryonthe right side of theeditorshows the CLSID information learned from this information, theCLSID IIS Admin Service is the corresponding service, now wecan determine the NETWORK SERVICE IIS Admin Service the userdoes not have permission to start.

Open the "start" - "control panel" - "management tools" -"service" - "computer" - "my computer" - "DCOM configuration"option to find "IIS Admin Service", the right key to select"properties", find "safe", in "activate permissions" inediting "custom", "NETWORK SERVICE, " added account gives the"local start" and "local activation" permission, restart IIS.Restart IIS, open the page again, andnow it has been displayed.