iOS Gmail app shows blank page on login.fcc - SPS

Products

• CA Single Sign On Secure Proxy Server (SiteMinder)
• CA Single Sign-On
• SITEMINDER
• CA Single Sign On Agents (SiteMinder)

Issue/Introduction

Running CA Access Gateway (SPS), when a user tries to login, the login page doesn't show up when the browser runs on iOS Mobile device.

Checking the code that is returned by the backend IIS Server, the following shows up:

404 15

 

Cause

The return code that IIS sends when accessing the login page is 404 15 which means:

  "Request Filtering: Denied because query string too long (IIS 7)" (1).

This happens as there is a limit in request query for IIS (2).

 

Resolution

On the backend IIS, add the following to the web.config:

  <system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxQueryString="32768"/>
      </requestFiltering>
    </security>
  </system.webServer>

Where maxQueryString is set to a higher value to match the possible expected queries. Check with the IIS administrator to set a reasonable value for the maxQueryString parameter.

 

Additional Information

 

1. IIS error log code (sc-status and sc-substatus)
   
   
2. Request Limits <requestLimits>