diff --git a/AppHarbor.Web.Security/CookieAuthenticator.cs b/AppHarbor.Web.Security/CookieAuthenticator.cs
index c3dd157..8f72a7a 100644
--- a/AppHarbor.Web.Security/CookieAuthenticator.cs
+++ b/AppHarbor.Web.Security/CookieAuthenticator.cs
@@ -50,6 +50,7 @@ public void SignOut()
 			_context.Response.Cookies.Add(new HttpCookie(_configuration.CookieName, "")
 			{
 				Expires = DateTime.UtcNow.AddMonths(-100),
+                		Domain = _configuration.Domain
 			});
 		}
 
diff --git a/AppHarbor.Web.Security/SymmetricEncryption.cs b/AppHarbor.Web.Security/SymmetricEncryption.cs
index e376351..b3713a0 100644
--- a/AppHarbor.Web.Security/SymmetricEncryption.cs
+++ b/AppHarbor.Web.Security/SymmetricEncryption.cs
@@ -33,17 +33,7 @@ public override byte[] Encrypt(byte[] valueBytes, byte[] initializationVector)
 			{
 				initializationVector = new byte[_algorithm.BlockSize / 8];
 			    var rng = RandomNumberGenerator.Create();
-			    try
-			    {
-                    rng.GetBytes(initializationVector);
-			    }
-			    finally 
-			    {
-                    if (rng != null)
-                    {
-                        ((IDisposable)rng).Dispose();
-                    }
-			    }
+            		rng.GetBytes(initializationVector);
                 
 			}
 			using (var output = new MemoryStream())