SharePoint is installed on the root Folder of IIS, sub-sites are in a folder under the root, and it's running on a Server 2008 R2 machine.
To start, i'm asking this question because after installing SharePoint 2013, other applications on sub-sites stopped working correctly. Specifically, the PHP pages still worked, but all the ASPX pages stopped and the error would refer to SharePoint references in the web.config (or another config file).
So my question is, when SharePoint 2013 is first installed, what configuration files does it change that could affect all the sites/sub-sites on the same server?
I should point out that I've checked the web.config file for any affected pages, double checked the application pool is setup right, and even checked the global web.config and machine.config in the C:\windows\microsoft.net\framework\v4.0*\config folder. I have not found any SharePoint references in any config file besides the one in the root folder that SharePoint is installed to.
I'm not as familiar with how the web.config affects other sites as well, so if it is the main web.config in the root folder in IIS, could you explain how that affects the sub-sites, and if there is any way to separate the two without putting them on separate domains/servers? Thanks.
Here's the last exception i was getting, which includes some of the references I see:
Exception type: PlatformNotSupportedException Exception message: Operation is not supported on this platform. at System.Web.HttpServerVarsCollection.Set(String name, String value) at Microsoft.SharePoint.IdentityModel.SPTokenCache.ReadToken(Byte token) at Microsoft.IdentityModel.Tokens.SessionSecurityTokenHandler.ReadToken(Byte token, SecurityTokenResolver tokenResolver) at Microsoft.IdentityModel.Web.SessionAuthenticationModule.ReadSessionTokenFromCookie(Byte sessionCookie) at Microsoft.IdentityModel.Web.SessionAuthenticationModule.TryReadSessionTokenFromCookie(SessionSecurityToken& sessionToken) at Microsoft.IdentityModel.Web.SessionAuthenticationModule.OnAuthenticateRequest(Object sender, EventArgs eventArgs) at Microsoft.SharePoint.IdentityModel.SPSessionAuthenticationModule.OnAuthenticateRequest(Object sender, EventArgs eventArgs) at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)