Single Sign On Siteminder Slowness on RP

Products

• CA Single Sign On Secure Proxy Server (SiteMinder)
• CA Single Sign On SOA Security Manager (SiteMinder)
• CA Single Sign-On

Issue/Introduction

We're running Policy Server and CA Access Gateway (SPS) 12.8
integrated with Azure for Single Sign-On, and we notice slowness in
responses in the browser, when processing HTTP headers.

How can we fix that ?

Cause

A DNS server didn't work properly, which brings delays in the server FQDN resolution. 

Environment

Policy Server 12.8 
CA Access Gateway (SPS) 12.8

Resolution

Fixing a non responding DNS server from the resolv.conf file fixed the
issue.