asp.net - Login control won't login -

i've been using vs 2013 , created asp.net web forms application using template bootstrap. have login control of default behaviour using aspnet tables within sql. when run within ide have no problems in browser logging site (ie, chrome) manly using ie when running.

however, have deployed site local server testing , stops working in ie. happens goes through validation of user name/password fine, gets redirect user never logged in.

if browse server using chrome on pc work fine if same within ie won't work 95% of time have managed login occasionally. have asked other colleague's try, chrome doesn't work of them or ie. have tried on ipad chrome work safari won't!

so in file startup.auth.vb

partial public class startup

' more information on configuring authentication, please visit http://go.microsoft.com/fwlink/?linkid=301883 public sub configureauth(app iappbuilder)     'configure db context, user manager , signin manager use single instance per request     app.createperowincontext(addressof applicationdbcontext.create)     app.createperowincontext(of applicationusermanager)(addressof applicationusermanager.create)     app.createperowincontext(of applicationsigninmanager)(addressof applicationsigninmanager.create)      ' enable application use cookie store information signed in user     app.usecookieauthentication(new cookieauthenticationoptions() {         .authenticationtype = defaultauthenticationtypes.applicationcookie,         .provider = new cookieauthenticationprovider() {             .onvalidateidentity = securitystampvalidator.onvalidateidentity(of applicationusermanager, applicationuser)(                 validateinterval:=timespan.fromminutes(10),                 regenerateidentity:=function(manager, user) user.generateuseridentityasync(manager))},         .loginpath = new pathstring("/account/login")})      ' use cookie temporarily store information user logging in third party login provider     app.useexternalsignincookie(defaultauthenticationtypes.externalcookie)      ' enables application temporarily store user information when verifying second factor in two-factor authentication process.     app.usetwofactorsignincookie(defaultauthenticationtypes.twofactorcookie, timespan.fromminutes(5))      ' enables application remember second login verification factor such phone or email.     ' once check option, second step of verification during login process remembered on device logged in from.     ' similar rememberme option when log in.     app.usetwofactorrememberbrowsercookie(defaultauthenticationtypes.twofactorrememberbrowsercookie)    end sub end class 

then on login button

protected sub login(sender object, e eventargs)     if isvalid         ' validate user password         dim manager = context.getowincontext().getusermanager(of applicationusermanager)()         dim signinmanager = context.getowincontext().getusermanager(of applicationsigninmanager)()          ' doen't count login failures towards account lockout         ' enable password failures trigger lockout, change shouldlockout := true         dim result = signinmanager.passwordsignin(email.text, password.text, rememberme.checked, shouldlockout:=true)          select case result             case signinstatus.success                 identityhelper.redirecttoreturnurl(request.querystring("returnurl"), response)                 exit select             case signinstatus.lockedout                 response.redirect("/account/lockout")                 exit select             case signinstatus.requiresverification                 response.redirect(string.format("/account/twofactorauthenticationsignin?returnurl={0}&rememberme={1}",                                                 request.querystring("returnurl"),                                                 rememberme.checked),                                   true)                 exit select             case else                 failuretext.text = "invalid login attempt"                 errormessage.visible = true                 exit select         end select     end if   end sub end class