ASP.NET web application return error 504 "Gateway Timeout"

Dear Code Masters,

I develop a web application using ASP.NET C#, the application is working fine i also create SQL registration using ASPNET_REGSQL i then create roles and authentication for the application, i finally deploy and host it.

The challange is when i imput the user name and password to Login into the application i get the following error :

504 "Gateway Timeout"

but when i remove the login.aspx and the roles from my SQL Database the application work fine.

please code master what can i do so that the Login.aspx and role will work on the host host site, because i need my viewers to Login to my application.

thank you all