MVC 5 Session Issue - asp.net-mvc

Question

Update 1: If i set the session via ajax request, this session is not available to me when the js does does a refresh of the current action. Now, if i setup a session via non ajax requests then these are available inside other controller even ajax actions as well.
Update 2: By removing and adding the session helped with this issue
<modules runAllManagedModulesForAllRequests="true">
<remove name="Session" />
<add name="Session" type="System.Web.SessionState.SessionStateModule"/>
</modules>
I am setting up a new site, this uses forms authentication that i am validating against the active directory. On successful authentication, i put the user class in the session and it is available to me when i check it right away.
//login user and put the user in session
AuthenticationHelper.LoginUser(user, loginModel.IsRememberMe);
//just checking
var userFromSession = AuthenticationHelper.GetUserFromSession();
public static void LoginUser(User user, bool isRememberMe)
{
//login user and put user in the session
//log off first
LogOff();
//add user to session
AddUserToSession(user);
//sign in
if (!isRememberMe)
{
//Set cookie
FormsAuthentication.SetAuthCookie(user.UserId, false);
/*
GenericIdentity identity = new GenericIdentity(user.UserId);
string[] roles = { person.PersonaType };
GenericPrincipal principal = new GenericPrincipal(identity, roles);
HttpContext.Current.User = principal;
*/
}
else
{
//Create Persistent cookie
var ticket = new FormsAuthenticationTicket(user.UserId, isRememberMe, 1);
var encrypted = FormsAuthentication.Encrypt(ticket);
var authCookie = new HttpCookie(FormsAuthentication.FormsCookieName, encrypted);
authCookie.Expires = System.DateTime.Now.AddYears(1);
if (HttpContext.Current != null)
{
HttpContext.Current.Response.Cookies.Add(authCookie);
}
}
}
public static void AddUserToSession(User user)
{
if (HttpContext.Current != null && HttpContext.Current.Session != null)
{
HttpContext.Current.Session["SignedInUser"] = user;
}
}
public static User GetUserFromSession()
{
User user = null;
if (HttpContext.Current != null && HttpContext.Current.Session != null)
{
user = (User) HttpContext.Current.Session["SignedInUser"];
}
return user;
}
However, when i refresh the page at the same very moment after login, my session is coming back as null. In this case Request.IsAuthenticated is true and User.Identity.Name has my user name in it.
I have the following in the web.config as well.
What am i missing here?
Here is the full web.config. Either i am missing something from the web.config or something is interfering with my session.
<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=301880
-->
<configuration>
<!-- Move site specific app settings to their own environment config file inside Configs folder. Keep common settings here -->
<appSettings file="Configs\AppSettings_CurrentSprint.config">
<add key="webpages:Version" value="3.0.0.0" />
<add key="webpages:Enabled" value="false" />
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
<machineKey validationKey="" validation="SHA1" decryption="AES" />
<sessionState mode="InProc" timeout="20" />
<authentication mode="Forms">
<forms loginUrl="~/EPT/Home" name="SalesSupport.ASPXFORMSAUTH" enableCrossAppRedirects="true" timeout="20" slidingExpiration="true" />
<!-- timeout="600" -->
</authentication>
<membership>
<providers>
<clear />
</providers>
</membership>
<profile>
<providers>
<clear />
</providers>
</profile>
<customErrors mode="Off" />
<pages>
<namespaces>
<add namespace="System.Web.Helpers" />
<add namespace="System.Web.Mvc" />
<add namespace="System.Web.Mvc.Ajax" />
<add namespace="System.Web.Mvc.Html" />
<add namespace="System.Web.Routing" />
<add namespace="System.Web.WebPages" />
<add namespace="System.Web.Optimization" />
</namespaces>
</pages>
</system.web>
<system.webServer>
<urlCompression doStaticCompression="true" doDynamicCompression="true" />
<validation validateIntegratedModeConfiguration="false" />
<!--Had to set this for it to work on IIS 7-->
<modules runAllManagedModulesForAllRequests="true" />
<handlers>
<remove name="ExtensionlessUrlHandler-Integrated-4.0" />
<remove name="OPTIONSVerbHandler" />
<remove name="TRACEVerbHandler" />
<add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
</handlers>
<staticContent>
<!--Required to get IIS to compress javascript files-->
<remove fileExtension=".js" />
<mimeMap fileExtension=".js" mimeType="text/javascript" />
</staticContent>
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />
<bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>