diff --git a/SharpHose/Nozzles/LDAP/LDAPNozzle.cs b/SharpHose/Nozzles/LDAP/LDAPNozzle.cs
index 4ffa595..143f2b7 100644
--- a/SharpHose/Nozzles/LDAP/LDAPNozzle.cs
+++ b/SharpHose/Nozzles/LDAP/LDAPNozzle.cs
@@ -284,7 +284,7 @@ private async Task<bool> TryCredentialsAsync(string username, string password)
             {
                 using (var context = GetPrincipalContext())
                 {
-                    return context.ValidateCredentials(username, password);
+                    return context.ValidateCredentials(username, password, ContextOptions.Negotiate | ContextOptions.Signing | ContextOptions.Sealing);
                 }
             });
         }