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What to do when an “HTTP Error 503. The service is unavailable” error occurs while running Web-related sample browsers

Platform: WinForms |
Control: General
Tags: general, iis


This issue can be resolved by registering ASP.NET in IIS. Follow the below steps to register ASP.NET in IIS:


·      Run aspnet_regiis.exe using the administrator command prompt. Run aspnet_regiis.exe for the highest available framework on your machine.  If you have the 4.0 framework, run the .exe from the following folder:


·      If you have only the 3.5 framework, run the .exe from the following folder:


              Please refer the below screen shot.




This will solve the “Service unavailable error” in IIS.

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