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IIS Site Randomly Returns 404 While App Pool Remains Started
Hello, We have an IIS site running behind Azure Front Door that becomes unavailable every few days. Symptoms: Application Pool remains started Users see the blue "Not Found" page from Azure Front Door When accessing the site directly on the server during the failure, we get a 404 from IIS, not Front Door The site does not recover on its own Recovery requires an App Pool recycle or IIS restart, and sometimes a full server reboot because recycle or IIS restart does not help What it is NOT: No CPU, memory, disk, or network pressure Event logs do not correlate with the outage When it happens: Random and unpredictable Any insights would be appreciated. From the server itself: Please your support.
HTTPS Reverse Proxy on IIS 10 – External Access Fails (Timeout) Although Local Requests Work
Hello everyone, I’m currently facing an issue with an IIS 10 reverse proxy configuration on Windows Server, and I would really appreciate your guidance. Environment Windows Server IIS 10 Application Request Routing (ARR) + URL Rewrite enabled Backend application running on: http://localhost:8080/ http://localhost:8080/login Public domain: https://lojistik.abc.com.tr What I want to achieve I want users to access the backend web application through the following URL: https://lojistik.abc.com.tr/LMYS/login Internally, IIS should proxy this to: http://localhost:8080/login What works The backend application is accessible without issues: http://localhost:8080/login From the server itself, reverse proxy works: Invoke-WebRequest "https://lojistik.abc.com.tr/LMYS/login" → StatusCode: 200 (success) What does NOT work From any client machine, the following request results in a timeout: https://lojistik.abc.com.tr/LMYS/login Browser shows connection timeout. No entry appears in IIS logs for external requests to /LMYS/.... Tests performed ▪ netstat -ano | findstr :443 on the server → Port 443 is listening ▪ DNS resolves correctly: lojistik.abc.com.tr → 10.6.130.90 ▪ Reverse proxy rule on IIS is correctly configured under the HTTPS binding site: Pattern: ^LMYS(/.*)?$ Rewrite to: http://localhost:8080{R:1} ▪ ARR Server Proxy is enabled. Key observation Requests from the server itself succeed (reverse proxy returns 200), but external clients always time out, which suggests that the HTTPS traffic is not reaching IIS at all (likely blocked or not NAT-forwarded on the network path). Question What could cause HTTPS (port 443) traffic to reach IIS locally, but external requests to the same port to hang indefinitely? Any guidance would be greatly appreciated. Thank you in advance. Best regards,
IIS app pool in-memory cache miss
Hi, Our IIS server runs on windows 2016 servers, recently we are experiencing frequent miss from in-memory cache, and instead of connecting to NCache which is our cache solution, it is sending request to database. After lots of debug we still could not identify the issue here. But as a best practice we are going to change some setting. But, one suggestion is to change max worker count from 4 to 1. Will that impact our performance? How much will it be effective to bring that value to 1 from 4, in terms of single worker cache miss issue occurrences?
Binding a website that already uses required port.
Hello devs, I hope you are having a great day. I have already developed a website that runs on port 8081 in localhost. When i start a new site in IIS and set 8081 as the port in the bind section(which is already open via the website), I receive the error that the port is already in use. My question is how can I connect my domain to the local host and specified port in IIS or any other application. The IIS has a default website(which brings the welcome page up) and by using that the connection between domain and server is assured(name servers are set and ready). If only the IIS could relay all traffic to the localhost and port 8081 of the server, my problem would be solved. I have attached some pictures for better understanding. Thank you in advance Best wishes, Sahand -As you see in this picture my website has started and working in the specified IP and port. ,-In this picture while binding the new website to port 8081 the IIS refuses to start the site with this error(port 8081 is already in use by my website).
IIS App pool crashes
Hi, We are experiencing some random app pool crashes on one of our production servers. I've put in place additional logging and analysed it through DebugDiag. The output from that is: In w3wp.exe.11696.dmp the assembly instruction at clr!Assembly::GetSecurityDescriptor+1a in C:\Windows\Microsoft.NET\Framework\v4.0.30319\clr.dll from Microsoft Corporation has caused an access violation exception (0xC0000005) when trying to read from memory location 0x00000040 on thread 9 I need further help to troubleshoot this and this seemed like the best place, but if it's not I'd appreciate someone pointing me in the right direction. Happy to post the full report if that would help or any other information that would be of use. Thanks.
IIS SERVER_PROTOCOL never returns HTTP2 (HTTP/2)
Using Windows Server 2025, I can not get the "SERVER_PROTOCOL" response header to return anything other than HTTP/1.1: For example, a simple classic ASP page with: <% Response.Write(Request.ServerVariables("SERVER_PROTOCOL")) %> Always returns "HTTP/1.1". I have verified the page is served via HTTP2 via developer tools in the browser and it's even upgraded to HTTP3/QUIC later on in the response sucessfully.Error executing JScript
I switched from Windows Server 2022 to 2025. I migrated all my domains and it works fine, but with an error: I can't run a script like "<SCRIPT Language="JScript" RUNAT=SERVER>" because it gives me a 500 error. If I go to https://www.vidauna.com/aaa.asp, there's an example from Microsoft, and if the page is refreshed, it gives a 500 error (once yes, once no). Looking for the reason for the error, I found it's because on another of my pages on the same domain I have set the string: "Session.Timeout = 20." If I create a new subdomain with just the example, it works fine, but without the example, I put: <% Session.Timeout = 20 %> It starts doing the same thing. When I refresh the page (F5), it gives a 500 error, and if I refresh it again, it appears fine, and so on. I've been searching for a solution for almost a month and can't find it. I can't have the page that uses JScript on the domain because it doesn't work (it worked fine on the previous server), and I'm trying to find the problem with the example. What I think is that I need to configure something in Windows Server 2025's IIS to prevent this error, but I don't know what it is. I hope someone knows the solution to this problem. Thank you. I'm Spanish, and the text was translated using Google Translate. The content of the aaa.asp example is: <%@ Language= "VBScript" %> <HTML> <BODY> <!-- Call the JScript procedure from within VBScript--> <% call printDate() %> <!--Call the VBScript procedure from within VBScrip--> <% Echo %> <BR> </BODY> </HTML> <%Sub Echo%> <!--Note: this will not output anything unless the page is called with a query string like https://localhost/test.asp?x=1%20have&y=a%20cunning&z=plan --> <% Response.Write "<TABLE BORDER=1>" & _ "<TR><TH>Name</TH><TH>Value</TH></TR>" Set objQueryString = Request.QueryString For Each strSelection In objQueryString Response.Write "<TR><TD>" & strSelection & "</TD><TD>" & _ objQueryString(strSelection) & "</TD></TR>" Next Response.Write "</TABLE>" End Sub %> <SCRIPT Language= "JScript" RUNAT=SERVER> function printDate() { var x x = new Date() Response.Write(x.toString()) Response.Write("<BR>") } </SCRIPT> The error is: Información detallada de error: Módulo IsapiModule Notificación ExecuteRequestHandler Controlador ASPClassic Código de error 0x00000000 Dirección URL solicitada https://www.vidauna.com:443/aaa.asp Ruta de acceso física ...\aaa.asp Método de inicio de sesión Anónimo Usuario de inicio de sesión AnónimoIIS port problem
Hi everybody! My company would like to use MantisBT and i got the task to setup mantis but i have some problem with it. I would like to run MantisBT on port 443 (https) but one application already use this port. (This application isn't based on IIS). The server which should run MantisBT has two network cards and using Windows Server 2019. The first (x.x.x.1) is used by the necessary monitoring application, the other one (x.x.x.2) should used by MantisBT. The problem is if i bind x.x.x.2 IP to port 443 than i got an error message: The process cannot access the file because: it is being used by another process.(Exception from HRESULT: 0x80070020) Any idea what should i do? Can you give me step by step advice? Thank you. Have a nice day! PNWeb site was working then my public IP address changed due to a move
I have update my public IP address here: And I have created a https certificate for the find-a-tradie.com.au web site using 'Certify the Web' windows software. All good that far. But I can't access https://www.find-a-tradie.com.au in chrome. So what settings in IIS do I need to modify to make it work again?
