6

How to change applicationHost.config in an Azure web app? I try:

using (ServerManager serverManager = new ServerManager())
{
    Microsoft.Web.Administration.Configuration config = serverManager.GetApplicationHostConfiguration();
    Microsoft.Web.Administration.ConfigurationSection webLimitsSection = config.GetSection("system.applicationHost/webLimits");

    webLimitsSection["connectionTimeout"] = TimeSpan.Parse("00:00:10");
    webLimitsSection["dynamicIdleThreshold"] = 150;
    webLimitsSection["headerWaitTimeout"] = TimeSpan.Parse("00:00:10");
    webLimitsSection["minBytesPerSecond"] = 500;

    serverManager.CommitChanges();
}

But catch exception:

Filename: \?\D:\Windows\system32\inetsrv\config\applicationHost.config Error: Cannot write configuration file due to insufficient permissions

abatishchev
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Andrew Babiychuk
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1 Answers1

20

The way to do this is to use XML Document Transforms (XDT) which is referenced here.

For your scenario, create a file called applicationhost.xdt that contains the following:

<configuration  xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
  <system.applicationHost>
    <webLimits xdt:Transform="SetAttributes(connectionTimeout)"
               connectionTimeout="00:00:10" />
    <webLimits xdt:Transform="SetAttributes(dynamicIdleThreshold)"
           dynamicIdleThreshold="150" />
    <webLimits xdt:Transform="SetAttributes(headerWaitTimeout)"
               headerWaitTimeout="00:00:10" />
    <webLimits xdt:Transform="SetAttributes(minBytesPerSecond)"
               minBytesPerSecond="500" />
  </system.applicationHost>
</configuration>

Then, using an FTP client (I used FileZilla), copy it to the site folder (not wwwroot) for your web app.

enter image description here

Finally, restart your web app which you can do from the Azure portal.

You can verify the changes are applied using the Kudu site extension. After signing into Kudu, go to the Debug Console (CMD) window and drill down into the Logfiles folder and then the Transform folder.

enter image description here

In the Transform folder you will see a "*scm.log" file that will show the transformations. It should look something like this.

enter image description here

Rick Rainey
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  • Hello [RickRainey](https://stackoverflow.com/users/2157294/rick-rainey) - Would you by chance have any solution to this [Rewrite Rule to IIS for HTTPS redirect to HTTP causes null HttpContext.Request.ContentType](https://stackoverflow.com/questions/48871977/rewrite-rule-to-iis-for-https-redirect-to-http-causes-null-httpcontext-request-c)? – ttugates Feb 19 '18 at 18:21