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+## Warmup
+
+Before allowing the ACME server to validate, the program will attempt to request
+the validation file itself and note the result of that request in the log. A side 
+effect of this is that it forces the application to start in case it's application pool
+or equivalent went to sleep, warming up the caches etc. This reduces the chance of 
+time-outs during validation. This used to be optional behaviour controlled by the 
+`--warmup` switch, but that is no longer in use.
+
+## web.config
+
+Optionally this plugin can place a `web.config` next to the validation file, to 
+help IIS properly serve the response. There are [many reasons](/win-acme/manual/validation-problems) 
+why IIS can fail to properly server the file. Some of them can be fixed this way. 
+
+In interactive mode the program will ask you if you want to do this. In unattended mode you 
+can request it with the parameter `--manualtargetisiis`
+
+### Changing the template
+
+The web.config that will be copied lives in the root of the program directory with the 
+name `web_config.xml`. You can modify it to fit your needs, e.g. for MVC sites you might need:
+
+```XML
+<configuration>
+    <system.webServer>
+        <staticContent>
+            <clear/>
+            <mimeMap fileExtension = ".*" mimeType="text/json" />
+        </staticContent>
+        <handlers>
+            <clear />
+            <add name="StaticFile" 
+				path="*" 
+				verb="*" 
+				type="" 
+				modules="StaticFileModule,DefaultDocumentModule,DirectoryListingModule" 
+				scriptProcessor="" 
+				resourceType="Either"
+				requireAccess="Read" 
+				allowPathInfo="false" 
+				preCondition="" 
+				responseBufferLimit="4194304" />
+        </handlers>
+    </system.webServer>
+</configuration>
+```
+
+Or to disable URL Rewriting you might need to add this (in the beginning, right after `<clear />`).
+
+```XML
+<rule name="LetsEncrypt Rule" stopProcessing="true">
+    <match url="^\.well-known.*$" />
+    <action type="None" />
+</rule>
+```
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