Cisco Ace Load Balancer + SharePoint 2010 Kerberos Fail

Problem

We have been having issues getting our brand new Cisco Ace Module to work with SharePoint 2010 running Kerberos authentication. The site would open but clicking on any click, especially opening InfoPath forms or document properties would result in a http 404 or similar error.

Solution

It turns out that this is to do with the way the Cisco Ace Module handles HTTP headers with its out of the box configuration. We made the following changes to the module and everything has been working smoothly since.

  • Changed Max Parse Length from 4KB to 65KB (max) for the HTTP Header.
  • Set the Length Exceed behaviour to Continue instead of the default Drop.
  • Toggled Case Insensitive and parsing Non-strict to true.

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