SWAT in HEAD won't let me authenrized!!

[Ma Gui Sheng]

	I have installed the HEAD branch 2.1.prealphaX on my Redhat 6.0, but after I 
have correctly setuped and installed , SWAT won't let me authenrized. Every time I use 
swat by www,it will tell me "authenrized fail" , I am sure the username and passwd are 
correct. While the MAIN branch 2.0.5a is alright.
	What is the matter?
BTW  Does the 2.0.5a includes the PDC code?