I have a website on the IIS 6.0 Windows Server 2003.

And I noticed that the server is calling the default page of the website every one second. (I can see it in server log, the IP of the HTTP request is the Server's IP).

And there is no software installed on the server to perform like that (Ping/keep alive).

I have no idea, why it is happening.

We just have full reboot three weeks ago and I'm not so sure whether it is happening before the reboot or happen only after the reboot.

Any idea appreciated.