ENDIAN Firewall - Local Website access also happens through proxy

I have Endian Community Firewall 2.4 installed in my organization. All my branch offices were already connected through OpenVPN. I have connected EFW using GW2GW to the OpenVPN Server. My IP Address for the branch where EFW is installed is 10.0.0.0/24. All other branches use 192.168.1.0/24, 192.168.2.0/24 etc. I have some internal website hosted on 10.0.0.100 using IIS. When browsing the internal website, it is asking for password continuously. It does not take the password. After asking for password thrice, it says authentication failure. Without EFW, the site is working fine. Also, I am able to browse to the homepage of IIS, which does not ask for authentication. I have joined EFW server to the domain as well. Still the same problem. Can somebody please help me.
Also, I think the local IPs should bypass the proxy and go directly to the website, which is not happening. Even when I browse the homepage of EFW from Local LAN, the proxy LOG shows connections to the same. Correct me if I am wrong int this.
Thanks in advance for any help provided.