IIS – Fixing ‘IIS Admin Service is Disabled’ Error When Running

Use netstat or ActivePorts to find if something is still holding on to port 80.

This problem might occur because ASP.NET limits the number of worker threads and completion port threads that a call can use to execute requests.

Typically, a call to a Web service uses one worker thread to execute the code that sends the request and one completion port thread to receive the callback from the Web service. However, if the request is redirected or requires authentication, the call may use as many as two worker and two completion port threads. Therefore, you can exhaust the managed ThreadPool when multiple Web service calls occur at the same time.

For example, suppose that the ThreadPool is limited to 10 worker threads, and all 10 worker threads are currently executing code that is waiting for a callback to execute. The callback can never execute because any work items that are queued to the ThreadPool are blocked until a thread becomes available.

Another potential source of contention is the maxconnection parameter that the System.Net namespace uses to limit the number of connections. Generally, this limit works as expected. However, if many applications try to make many requests to a single IP address at the same time, threads may have to wait for an available connection. To resolve these problems, you can tune the following parameters in your Machine.config file to best fit your situation:

* maxWorkerThreads
* minWorkerThreads
* maxIoThreads
* minFreeThreads
* minLocalRequestFreeThreads
* maxconnection
* executionTimeout

To successfully resolve these problems, do the following...

The quote's continued here... If that doesn't work, you can dig deeper with what's explained here.