Thanks for the module.  You definitely wanna handle the 'Set-Cookie' key possibly not being there (which would be nil), this occurs when you're firing against the wrong web server, or for some reason a newer/future version of your target doesn't set this for some reason. Example:

	[-] Auxiliary failed: NoMethodError undefined method `split' for nil:NilClass
	[-] Call stack:
	[-]   /msf/modules/auxiliary/scanner/http/cisco_ironport_enum.rb:67:in `is_app_ironport?'
	[-]   /msf/modules/auxiliary/scanner/http/cisco_ironport_enum.rb:41:in `run_host'
	[-]   /msf/lib/msf/core/auxiliary/scanner.rb:94:in `block in run'
	[-]   /msf/lib/msf/core/thread_manager.rb:100:in `call'
	[-]   /msf/lib/msf/core/thread_manager.rb:100:in `block in spawn'
	[*] Auxiliary module execution completed