title: I can sign in to Liferay using IP address but cannot login using the portal URL
body: <p>I have two Liferay 6.2 instances that an HAProxy is in front of them for load balancing purposes. HAproxy exists on another server and has its own IP address. The portal URL points to the HAproxy load balancer. I can sign in using the IP address of any of the Liferay servers. When I want to sign in using the URL, I am successfully redirected to Sign In page of Liferay but after entering user/pass and clicking Sign In button, the Sign In page appears again without any error message, nither on UI nor on the Tomcat log. Based on the Tomcat log, the background sign in process works well, but it doesn't redirect to any proper page of the portal. Moreover, if I enter wrong credentials, no error messages are displayed and the Sign In page appears again.</p>