http.sys LimitExceeded误差

Question

我们有一个ASP.NET核心3.0应用程序托管在Windows 2016的IIS后面。在重载(5,000+并发用户)的情况下，我们开始收到消息“服务不可用”的503个错误。

我在%SystemRoot%\System32\LogFiles\HTTPERR上查看了日志，发现它们主要是由于“极限激励”。以下是一些样本数据：

2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 205 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 207 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 209 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 211 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 213 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 215 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 217 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 219 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 221 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 223 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 225 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 227 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 229 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 231 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 233 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 235 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 237 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 239 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 241 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 243 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 245 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 247 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 249 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 251 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 253 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 255 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 257 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 259 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 261 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 263 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 265 - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - 267 - - LimitExceeded -
2019-11-22 20:36:33 5.113.159.51 47537 185.211.56.203 443 - - - - - - Client_Reset -
2019-11-22 20:36:33 5.125.149.3 54861 185.211.56.203 443 HTTP/2.0 GET /api/messaging/checkcallcompatibility 72959 - 7 Client_Reset patogh.me(domain)(4.0)(pool)
2019-11-22 20:36:33 5.112.111.38 36112 185.211.56.203 443 - - - - - - ClientCancel -
2019-11-22 20:36:33 5.121.34.242 55374 185.211.56.203 443 HTTP/2.0 GET /api/messaging/checkcallcompatibility 94051 - 7 Client_Reset patogh.me(domain)(4.0)(pool)
2019-11-22 20:36:33 83.122.43.131 34801 185.211.56.203 443 - - - - - - LimitExceeded -
2019-11-22 20:36:33 5.119.159.122 51429 185.211.56.203 443 - - - - - - LimitExceeded -
2019-11-22 20:36:33 5.74.28.250 12622 185.211.56.203 443 - - - - - - Client_Reset -
2019-11-22 20:36:33 5.112.111.38 36113 185.211.56.203 443 - - - - - - Client_Reset -
2019-11-22 20:36:33 89.196.176.185 38334 185.211.56.203 443 HTTP/2.0 GET /api/messaging/checkcallcompatibility 4921 - 7 Client_Reset patogh.me(domain)(4.0)(pool)
2019-11-22 20:36:34 5.121.34.242 55374 185.211.56.203 443 HTTP/2.0 GET /api/messaging/checkcallcompatibility 94065 - 7 Client_Reset patogh.me(domain)(4.0)(pool)
2019-11-22 20:36:34 91.251.90.58 43009 185.211.56.203 443 HTTP/2.0 GET /api/messaging/checkcallcompatibility 68999 - 7 Client_Reset patogh.me(domain)(4.0)(pool)
2019-11-22 20:36:34 5.112.111.38 36115 185.211.56.203 443 - - - - - - Client_Reset -
2019-11-22 20:36:34 172.80.200.76 56406 185.211.56.203 443 - - - - - - Client_Reset -

那么，我如何知道超出了哪个限制，以及如何更改该限制？

Answer 1

在浪费了一个星期，失去了很多钱之后，偶然发现了这个可以追溯到2012年的教程。

https://github.com/SignalR/SignalR/wiki/Performance

显然，IIS处理的每个应用程序的最大并发请求有一个荒谬的5,000次限制。因此，我在%windir%\System32\inetsrv\上运行了下面的命令，将其更改为50,000。

appcmd.exe set config /section:system.webserver/serverRuntime /appConcurrentRequestLimit:50000

如果web套接字不是一件事，并且服务器没有足够的功能来处理更多的请求，这个限制可能就足够高了。目前，大多数服务器都可以很容易地处理数万个并发请求，许多应用程序都需要持久的web套接字连接。