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Technical Articles

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IIS

How to troubleshoot IIS 503 service unavailable errors?

A503ServiceUnavailableerrorinIIStypicallyindicatesanapplicationpoolissue;checkitsstatusinIISManagerandstartitifstopped.2.Ifthepoolfailstostart,reviewEventViewerlogsforerrorsrelatedtoWAS,W3SVC,orw3wp.execrashes.3.Validatetheapplicationpoolidentity,ens

Sep 02, 2025 am 08:07 AM

troubleshooting IIS 503

How to resolve 'HTTP Error 503' in Windows IIS?

Check the status of the application pool, and start it if it is stopped; 2. Fix the application pool identity or permissions issue to ensure that the correct account is used and sufficient permissions are available; 3. View the error log in the event viewer to locate the root cause; 4. Recycle or restart the application pool to resolve temporary failures; 5. Verify the website binding and port conflicts to ensure that the configuration is correct and no other services occupy the port; 6. Re-register ASP.NET to fix possible framework registration issues; 7. Enable failed request tracking to obtain detailed error information; 8. Ensure that IIS-related services such as W3SVC and WAS are running and the startup type is set to automatic. Usually, the 503 error can be solved by restarting the application pool and resolving the identity permission issue. If the problem continues, the root cause needs to be checked based on the event log.

Sep 01, 2025 am 04:54 AM

iis http error

What is the IIS Metabase?

TheIISMetabaseisahierarchicalconfigurationdatabaseforIIS,structuredliketheWindowsregistry,withrootnodesforserverinstancesandchildnodesforwebsitesanddirectories;itstoredsettingssuchasIPaddresses,ports,andauthenticationinIIS5.0and6.0viaMetaBase.xml,whi

Sep 01, 2025 am 01:04 AM

iis

How to set up load balancing with IIS?

Using IIS to achieve load balancing requires external distribution of traffic to improve performance and reliability. 1. It can adopt the network load balancing (NLB) function that comes with Windows, and distributes requests to multiple IIS nodes by configuring cluster and port rules, which is suitable for small and medium-sized environments. 2. Use IIS's ApplicationRequestRouting (ARR) module as a reverse proxy, supporting advanced routing, health monitoring and SSL offloading, providing more granular control. 3. It is recommended to use hardware or cloud load balancers (such as AzureLoadBalancer, AWSELB, F5, etc.) in production environments, which have high availability and scalability. Either way, you need to ensure backend IIS services

Aug 31, 2025 am 01:12 AM

iis load balancing

How to manage IIS remotely?

First, enable and configure IIS management services, including starting the web management services, setting up remote connections and ports; then configure the Windows firewall to allow communication on the corresponding ports; then install the IIS management console on the remote computer; finally realize remote management by entering the server address, port and credentials.

Aug 31, 2025 am 12:18 AM

How to deploy a Node.js application to IIS?

The answer is to use iisnode to deploy Node.js app on IIS. First, enable IIS and the required components, install the ARR, URLRewrite and iisnode modules; prepare the application and ensure that the process.env.PORT is listened to; create a site in IIS, set the application pool to "unmanaged code", and configure the web.config file to rewrite the request to app.js; finally, test and check the iisnode log error through the browser to check the errors, and implement IIS as a reverse proxy to run the Node.js application.

Aug 30, 2025 am 01:37 AM

node.js iis

How to remove server headers in IIS?

First, remove X-Powered-By and X-AspNet-Version through web.config, then clear the Server header with URL rewrite rules, and finally disable the version header in system.web to reduce information leakage.

Aug 30, 2025 am 12:31 AM

iis 服務(wù)器頭

How to fix 404 errors in an IIS hosted application?

404 errors are usually caused by missing files, configuration errors or routing problems. You need to check the file path, IIS site settings, handler mapping and web.config rewrite rules, and use failed requests to track and locate the specific reasons.

Aug 29, 2025 am 06:55 AM

iis 404 error

How to enable detailed error messages in IIS?

EnabledetailederrorsinIISManagerbyselecting"DetailedErrors"inErrorPagessettings.2.Updateweb.configtosetcustomErrorsmode="Off"andhttpErrorserrorMode="Detailed".3.OptionallyenableFailedRequestTracingfordeeperdiagnostics.Ap

Aug 29, 2025 am 05:39 AM

How to find SQL injection attempts in IIS logs?

To discover SQL injection attacks in IIS logs, you need to focus on identifying exception request patterns, especially URLs or POST data containing malicious SQL keywords. 1. Check the suspicious parameters in the URL query string, pay attention to UNION, SELECT, DROP, INSERT, EXEC, 'OR1=1--- and other keywords, check the cs-uri-query and cs-uri-stem fields, and pay attention to the URL encoding (such as ' means single quotes); 2. Check the POST request body, enable W3C extended log format to record cs-Referer and cs-User-Agent by configuring IIS, or use ELKStack, Splunk and other tools to capture the complete

Aug 28, 2025 am 08:04 AM

How do I enable URL Rewrite in IIS?

To enable URL rewriting in IIS, you must first install the URL rewriting module: 1. Download and install the URL rewriting module from Microsoft's official website, and restart IIS after installation; 2. Verify whether the "URLRewrite" icon appears in the IIS manager to confirm that the installation is successful; 3. Create a rewrite rule: Open URL rewriting in the target site, add inbound rules, configure matching patterns and rewrite URLs, and optionally set conditions. After saving, the rules will be written to the web.config file; 4. Test the rewrite function, access the original URL through the browser, confirm that the request has been rewrited correctly and no redirection has occurred. You can use the "Test Mode" in the rule editor to verify the regular expression matching. After completing the configuration, you can achieve SEO-friendly URL replay.

Aug 28, 2025 am 07:59 AM

iis

How to resolve a 503 Service Unavailable error in IIS?

ChecktheApplicationPoolStatusinIISManagerandstartitifstopped;ifitkeepsstopping,investigatefurther.2.VerifytheApplicationPoolIdentityhasproperpermissionsbyusingApplicationPoolIdentityorensuringacustomaccounthasaccesstothesitedirectory,ASP.NETtempfolde

Aug 27, 2025 am 08:36 AM

iis 503 error

How to troubleshoot common IIS errors?

ForHTTP500errors,enabledetailederrorsinIIS,checkEventViewer,validateweb.config,anduseFailedRequestTracingtoidentifytherootcause.2.ForHTTP403errors,verifyNTFSpermissionsfortheapplicationpoolidentity,confirmcorrectauthenticationsettings,andensureeither

Aug 27, 2025 am 08:35 AM

How to deploy an ASP.NET Core application to IIS?

Install ASP.NETCoreHostingBundle to ensure that the server supports ASP.NETCore application running, including .NET runtime and IIS modules, and restart IIS through the commands netstopwas/y and netstartw3svc; 2. Use VisualStudio or CLI (dotnetpublish-cRelease-oC:\publish), and it is recommended to use framework-dependent deployment; 3. Copy the publishing file to the server directory (such as C:\inetpub\wwwroot\MyApp), and ensure that IIS_IUSRS has read and execute permissions; 4. Create a new one in IIS

Aug 26, 2025 am 05:35 AM