How do I prevent IIS 7.5 from caching symlink content?
Banin's solution worked for me. The issue was resolved after changing registry parameter and resetting IIS. The C# program below (you can use LINQPad to run it) will help you reproduce the issue:
using System.IO;
using System.Net;
void Main()
{
var virtualPath = "JunctionPoint/sample.js";
var physicalPath = $@"C:\IISROOT\JunctionPoint\{virtualPath}";
for (int i = 0; i < 100; i++) {
File.WriteAllText(physicalPath, i.ToString());
Console.Write(i + "=");
var client = new WebClient();
string html = client.DownloadString($"http://localhost/{virtualPath}");
Console.WriteLine(html);
if (i.ToString() != html) {
Console.WriteLine("Issue reproduced!!!");
}
}
}
This problem drove me nuts for like a month a while back. You have to disable IIS caching in the registry, as far as I know this isn't documented anywhere for IIS 7 but instead is an old IIS 5 trick that still works. You can either turn the below into a .reg file and import it or you can just navigate to the section and add it manually. I recommend rebooting after changing this parameter, I'm not sure if IIS picks it up after just an iisreset.
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\InetInfo\Parameters]
"DisableMemoryCache"=dword:1
I was previously able to fix this issue on IIS7 with Banin's fix. Since then, I have moved to Windows 10 with IIS 10, and suffered the same problem again. DisableMemoryCache
did not help.
I then disabled kernel caching, and for now, that seems to fix the issue (I'm sorry for the Dutch in the screenshot):