Wednesday, June 3, 2026

Application catalog error with IIS HTTP Error 503

Issue Reported: Application catalog error with IIS HTTP Error 503. The Service is unavailable.

Getting below error:

Solutions: 

Step 1: Validate component found that many error reported. Refer below screen shot for reference.

Step 2: After validate verify IIS services look like application service was not running. Refer below screen shot for reference.

Step 3: Started Configmgr Service Portal Pool and validate component and web service it start working as normal.

Happy learning!!!

Haresh Hirani
Email: [email protected], [email protected]
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Author

  • Hi, I’m Haresh Hirani the mind behind Hiraniconfigmgr.com. I’m a seasoned IT professional with deep expertise in Microsoft technologies, especially in Configuration Manager (ConfigMgr/SCCM). Over the years, I’ve expanded my skill set to cover a broader range of modern device management platforms like Microsoft Intune, Jamf Pro, ManageEngine Endpoint Central, and VMware AirWatch (Workspace ONE UEM), I use this blog to document real-world, tested, working fixes and walkthroughs from my daily technical experiences. The 💡idea is simple: if it helped me, it might help someone like you. My goal is to create a living repository of practical IT solutions for the community. If you find something useful, or if you want to collaborate, feel free to connect with me on LinkedIn or drop a message through the Contact page. Happy to help.

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