the issue of http error 503

[123]

Whenever I open multiple pages, including the view page at http://127.0.0.1:10008/Scheme/SchemeView/2, and stay on other pages for an hour or more, the following error occurs.
Request:
GET /Api/Main/GetCurDataByView?viewID=2&cnlListID=7554238706143808901&appendUnit=false HTTP/1.1
Accept: */*
Accept-Encoding: gzip, deflate, br, zstd
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8,en-GB;q=0.7,en-US;q=0.6
Connection: keep-alive
Cookie: .AspNetCore.Antiforgery.Qxk1X7AKGrA=CfDJ8ADR4IYKHB1FhiVdpDNfor8FPUdtdZFnwSWOxuoJz1mcoWlH145Zid8GOm-xkNwWHiBbTHq5Ky11NYdExlZ1PXSovO72oZ0UUmu8JEErBON-9p6jNver7Aq9UcB_43V9Wz8Dusb5SSAhMIA5qwAHNkA; .AspNetCore.Cookies=CfDJ8ADR4IYKHB1FhiVdpDNfor89ni2oY9pebuzXffZ7_yTCFmkBYbnxpmR0hKRf7sOrQHeXCV1-lhrfBdY2GwDMADJH-hfGPS8yCiP3cWxS3QJCMqYExqK5u9S4mSnC3vKkqumDSwu6OMY092ddzgfr21lEgKILxsUPxsCISbDI0RdY6McHgQKSdl7ZF-5LPgBw2P8LPaPTaaGVyekyuLjWygLMwjCILmiUpmd7ObfoMxCGtWU5FnTOCkFfDB2n7B7iCWng4S240X13xjLvuXBr7-TLqjrj3vrCXDYqcwTTkfIdvRap6slL054Q0wFgV1VBaUkCcqmX4XhMDqF5NFZiEwq_cAeyaCKAuoEAwfIRkvCzTuP3Ufz9sujOXgaJkt9LiPgdVHg3KH2yJ6sVGSZedwGySO-bWwr_RmaQ0Ruk9jOprT_K_fBoKU6aTXDw5vzl98wSWqtNnxtq_25AS4QzWAD6p3aM7j61MV1g6GmeOA7-XnJa4oI4_tCRGMel6F12DdE329bSLhPBstOGzHlqlven91gRy_k9-3Q8UrmhHHWiRjfHQfn3m5WRCipmpO1XEFxe5rue6MEuEomvu8i7-c1rWEr4WkWHDLVEm8oFlpRk; .AspNetCore.Mvc.CookieTempDataProvider=CfDJ8ADR4IYKHB1FhiVdpDNfor8BSqWVUyA43PzNsWdqHlbt2h0WWBMWtMnZ3S-GosA6FLSbpbUVTMeJTXgXzc5RdpLw3xd0uqITOo7z6K6PetXvkPa9Y5L-izGX3UiklatBO0WaQJ_AplD7KHuJmh8XjNU
Host: 127.0.0.1:10008
Referer: http://127.0.0.1:10008/Scheme/SchemeView/2
Sec-Fetch-Dest: empty
Sec-Fetch-Mode: cors
Sec-Fetch-Site: same-origin
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36 Edg/140.0.0.0
sec-ch-ua: “Chromium”;v=”140″, “Not=A?Brand”;v=”24″, “Microsoft Edge”;v=”140″
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: “Windows”

Response:
{“type”:”https://tools.ietf.org/html/rfc9110#section-15.6.4″,”title”:”Service Unavailable”,”status”:503,”traceId”:”00-6c3c614114982e999ce2f2c813a99620-bf51bc9f5b179ec2-00″}

However, if I remain on the page http://127.0.0.1:10008/Scheme/SchemeView/2, even for more than 10 hours, the aforementioned error does not appear. What is the reason for this?

[Mikhail]

Hello,
By default, IIS may stop if the web application not active. To prevent that, start Internet Information Services (IIS) Manager, select the ScadaAppPool application pool, open Advanced Settings of the application pool, and set the following options:

General – Start Mode: AlwaysRunning
Process Model – Idle Time-out: 0
Recycling – Regular Time Interval: 0

as described in this article.

[Author]

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