How do we debug a “This service is unavailable” error message for our website? RRS feed

  • Question

  • We've recently had an issue where our application/website was displaying "The service is unavailable" message to users. Please note it wasn't the typical message where it displays the 503 error code that IIS typically generates...the only text on the page was "The service is unavailable" (it did not show any error codes or any additional text).

    We stopped the application pool and started it back up, and the site began to work again. It was down for approximately 15 minutes.

    We've gone through all of the log files and interestingly enough there was some traffic going to the server during the 15 minutes we were seeing the "The services is unavailable" message, without any 503 attempts being logged, no windows event errors, etc.

    Does anyone have any ideas how to isolate the issue or find a log file that would display what happened?

    Sunday, April 7, 2019 2:49 PM

All replies

  • Hi friend,

    Welcome to the MSDN forum.

    According to your description, this issue is about the IIS development and our forum is to discuss the VS IDE, please redirect to this appropriate forum: to seek for better support, thank you for your understanding.

    Have a nice day!

    Best regards,


    MSDN Community Support Please remember to click "Mark as Answer" the responses that resolved your issue, and to click "Unmark as Answer" if not. This can be beneficial to other community members reading this thread. If you have any compliments or complaints to MSDN Support, feel free to contact

    Monday, April 8, 2019 1:47 AM
  • You possibly had too many concurrent request which was making your site unavailable.  
    Monday, April 8, 2019 1:53 AM