IIS Web Application occasional "service unavailable" or garbled fonts, use the following solution can be found.
The reason: Such cases often occur in iis is installed or occurs after the Visual Studio .NET Framework, iis asp.net site can not be resolved correctly, but can access the html page,
1. open the "Computer Management → Services and Applications → → Internet Information Services Web site," right-open the properties of our site layout, open the ASP.NET tab, check to see if the correct version of .NET, in this case the asp.net the site is built on the .NET 2.0 environment, so the choice of ASP.NET version 2.0.50727 if it is developed in .NET 4.0 environment, select 4.0.30319 so on.
2. Open the "Start → Run → cmd", carried out in the .NET environment command prompt re-registration,
cd locate the .NET installation location C: \ Windows \ Microsoft.NET \ Framework \ v4.0.30319 ,
Re-registration aspnet_regiis.exe -i -enable .