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HTTP Error 503. The service is unavailable.

27 Jul

I run a Microsoft IIS server that hosts a student application. When it was installed by a third party vendor, I gave them a specific username and password that was a Domain Admin on our Active Directory network. They installed various application pools and other items under this username.

Once they were finished and everything was up and running, I disabled that account. Little did I know, they had installed an application pool with these credentials. So once I rebooted the server, the application pool did not start and I received a HTTP Error 503 – The service is unavailable error code.

Once I found the application pool, I performed the following:

  1. Open IIS Manager
  2. Click on the Application Pools option in the left menu
  3. Found the application pool that was stopped, right mouse clicked and chose Advanced Settings
  4. Under the Process Model section, under the identity option, I clicked the “” button and then clicked on the SET button. I then entered the correct username and password.

Once this was done, I right clicked the application pool and selected START. It started immediately and the 503 error was no longer a problem. Yay!

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Posted by on July 27, 2012 in IIS

 

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