Web Reference: Aug 26, 2024 · Here’s a common scenario that many System Administrators, DevOps engineers, and Developers might encounter when users attempt to browse a site hosted on IIS, they receive an HTTP Error 503 Service Unavailable message as below. Jan 16, 2026 · The HTTP 503 error in IIS 7.0 due to a stopped application pool is often traceable to an invalid identity. By systematically verifying the username/password, ensuring the account is active, and granting "Log on as a batch job" rights, you can resolve most cases. Mar 7, 2013 · While there may be several reasons why this may occur, in this specific case, the 503 error was occurring because the Application pool failed to start. This was because the password was changed recently for the Identity under which the application pool was trying to run.
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